CN106872514A - Steady Heat Transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring system and method - Google Patents
Steady Heat Transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring system and method Download PDFInfo
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Abstract
A kind of Steady Heat Transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring system and method, belong to field of heat exchange.The on-line monitoring system includes the first temperature sensor, second temperature sensor, three-temperature sensor, the 4th temperature sensor, flowmeter, central processing unit and display；Use the method that the system is monitored on-line for：1. original state or heat-exchange system are run after over cleaning in heat-exchange system, heat exchanger cold side also without in the state of dirt deposition, determines benchmark Coefficient K0；2., according to production needs, after heat exchanger operation, detection Coefficient K can in real time be calculatedtime；3. dirtiness resistance value is calculated.Heat transfer coefficient that the system and method are measured and dirtiness resistance value can effecting reaction system really exchange heat situation；Accumulation mass data, sets up heat exchanger data acquisition system, and heat exchanging device establishes data basis steadily in the long term, and system equipment low cost is applied widely.
Description
Technical field
The present invention relates to a kind of field of heat exchange, more specifically a kind of Steady Heat Transfer process heat transfer coefficient and dirtiness resistance
Value on-line monitoring system and method and its specific implementation technical scheme.
Background technology
Heat exchange is one of most important unit operation of industrial processes.Various high temperature fluids in industrial production, such as refine
The high temperature oil of oily process, cracked gas, the low-pressure steam after power plants generating electricity etc. must be cooled down by cooling water.But these
Fluid can not be with cooling water directly contact, it is necessary to separates hot fluid and cooling water by various types of heat exchangers, and passes through
Hot fluid heat transfer to cooling water, is realized the heat exchange between hot fluid and cooling water by heat exchanger wall.Heat exchange operation is to be permitted
The basic guarantee of many industrial processes continuous-stable operations, it is significant to improve production efficiency, reduction energy consumption,
Shared capital investment shares are also very high in many industries, such as petroleum refining industry heat exchanger cost is up to equipment investment
30%-40%.
Continuous-stable heat transfer process is the basis of industrial production efficiency and benefit and ensures.When heat transfer process continuous-stable enters
During row, temperature is not changed over time at heat exchanger interior point, and this diabatic process turns into steady state heat transfer process.Steady state heat transfer mistake
Cheng Fuhe heat exchange fundamental equation, i.e. unit interval in transmission heat equal to overall heat-transfer coefficient be multiplied by heat exchanger heat transfer area multiplied by
With the cold and hot flow temperature difference average value in heat exchanger two ends.When overall heat-transfer coefficient is that temperature often differs 1K between cold fluid and hot fluid, in unit
The interior heat that can be transmitted by unit area heat exchange area.It is characterized in given cold fluid and hot fluid temperature and heat exchanger condition
Under, the heat-transfer capability of whole heat exchange system.
The heat transfer of heat exchange system can be analyzed to (1) hot fluid and transfer heat to heat exchange by convection heat transfer' heat-transfer by convection in flow process
Wall；(2) conduction process of heat exchanger wall；(3) heat exchanger wall transfers heat to the process of cooling water.And overall heat exchange system
The heat-transfer capability resistance that may be restricted to suffered by these three processes.Due to hot heat transfer fluid process and heat exchanger wall conduction process
Generally change very little, and often there is fouling and dirt deposition in cooling water diabatic process, cause because circulating water quality deteriorates
Heat transmission resistance increases, and produces so-called dirtiness resistance, causes heat transfer coefficient and heat exchange efficiency to decline.Severe patient can also have a strong impact on and change
Thermal effect, influences system continuous and steady operation.
In sum, overall heat-transfer coefficient and dirtiness resistance value how are effectively determined, for monitoring heat-exchange system efficiency, is maintained
Heat-exchange system or even the continuous and steady operation of whole industrial processes, and then improve production efficiency and benefit have important meaning
Justice.
At present, heat transfer coefficient and being mainly for dirtiness resistance value are monitored by instrument simulation heat transfer process, main bag
Include two methods of dynamic simulant test and constant temperature state test.Dynamic simulant test method is using dynamic simulant test device, with electricity
Plus thermogenetic vapor simulation hot fluid, be passed through cooling water in simulation heat exchanger opposite side, determine cold side recirculated water flow and
Temperature, then can determine the heat transfer coefficient and dirtiness resistance value under the condition of water quality.The test of constant temperature state is surveyed using constant temperature state
Trial assembly is put, and with electrically heated detector simulation heat exchanger tube, the heat transfer system under the condition of water quality is determined under recirculated water constant temperature
Number and dirtiness resistance value.Constant temperature state test device is simpler, but can only determine the recirculated water fouling under a certain temperature conditionss and become
Gesture.But either dynamic analog or constant temperature state analog detection method all have the disadvantage that and not enough：
Firstth, either dynamic analog or constant temperature state analog detection method are all a certain states to system heat transfer process
It is simulated, the heat exchange state of real heat-exchange system can not be really reacted completely, therefore the heat transfer coefficient that is determined and dirt
Dirty thermal resistance value might not be representative, also not necessarily can effecting reaction system really exchange heat situation.
Secondth, either dynamic analog or constant temperature state analog detection method are all permanent using electrothermal method simulation hot fluid
Temperature state, cold fluid effluent amount, flow velocity, temperature are caused when not considering that actual heat transfer process hot-fluid side thermic load changes
The change of degree, thus can only system heat transfer coefficient and dirtiness resistance value under a certain particular state of simulation test, and cannot exist in real time
Line is monitored.
3rd, due to above-mentioned reason, either dynamic analog or the data measured by constant temperature state analog detection method are only
As the reference value of system operation, and the data foundation of actual heat exchange operation decision-making can be cannot function as.
4th, analog detection method is required for proprietary test equipment, and equipment investment is high, it is also desirable to which special messenger is safeguarded, increased
Business burden is added, it is difficult to meet enterprise, especially the demand of medium-sized and small enterprises and medium and small heat-exchange system, it is impossible to extensive use.
In sum, for heat-exchange system develop a kind of steady state heat transfer process heat transfer coefficient and dirtiness resistance value it is real-time
Line monitoring method is significant.
The content of the invention
The present invention for it is existing simulation monitoring method exist problem, invented a kind of Steady Heat Transfer process heat transfer coefficient and
Dirtiness resistance value on-line monitoring system and method, the system and method are true, the dynamic running status for reflecting heat-exchange system,
Measured heat transfer coefficient and dirtiness resistance value can effecting reaction system really exchange heat situation；Accumulation mass data, sets up
Heat exchanger data acquisition system, heat exchanging device establishes data basis steadily in the long term, and system equipment low cost is applied widely.
A kind of steady state heat transfer process heat transfer coefficient of the invention and dirtiness resistance value on-line monitoring system, including：First temperature
Degree sensor, second temperature sensor, three-temperature sensor, the 4th temperature sensor, flowmeter, central processing unit and display
Device；
Wherein, the first temperature sensor is arranged on exchanger heat side-entrance end, and second temperature sensor is arranged on heat exchanger
Hot side outlet end, three-temperature sensor is arranged on heat exchanger cold side import end, and it is cold that the 4th temperature sensor is arranged on heat exchanger
Side outlet end, flowmeter is additionally provided with cold side outlet port end, and the first temperature sensor, second temperature sensor, the 3rd temperature are passed
Sensor, the 4th temperature sensor and flowmeter are connected with central processing unit, and central processing unit is also connected with display.
Described the first temperature sensor, second temperature sensor, three-temperature sensor, the 4th temperature sensor and stream
The mode that gauge is connected with central processing unit be it is wired or wireless in one kind.
Wherein, the first temperature sensor is used to detect exchanger heat side-entrance end hot fluid temperature, second temperature sensor
For detecting exchanger heat side outlet end hot fluid temperature, three-temperature sensor is used to detect that heat exchanger cold side import end cools down
Coolant-temperature gage, the 4th temperature sensor is used to detect heat exchanger cold side outlet port end cooling water temperature that flowmeter to be used to detect heat exchanger
Cold side circulating water flow.
The metering numerical value feeding central processing unit that all temperature sensors and flowmeter are gathered, enters in central processing unit
Row is arranged after calculating and obtains heat transfer coefficient and dirtiness resistance value numerical value, is then shown by display.
A kind of steady state heat transfer process heat transfer coefficient of the invention and dirtiness resistance value on-line monitoring method, including following step
Suddenly：
Step 1：Obtain initial information, calculating benchmark heat transfer coefficient
Original state or heat-exchange system are run after over cleaning in heat-exchange system, and heat exchanger cold side is also without dirt deposition
In the state of, the heat exchanger cold side circulating water flow that the temperature value and flowmeter detected according to each temperature sensor are detected, meter
Calculate heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith exchanger heat transfer capacity Q, according to heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith change
Hot device heat output Q determines Coefficient K, i.e., on the basis of Coefficient K0；
Step 2：Detection information is obtained, detection heat transfer coefficient is calculated
According to production needs, after heat exchanger operation, can real-time monitoring each temperature sensor temperature and flowmeter detection
Heat exchanger cold side circulating water flow, calculate heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith exchanger heat transfer capacity Q, calculate in real time
Current Coefficient K, as detects Coefficient Ktime；
Step 3：Calculate dirtiness resistance value
Use benchmark Coefficient K0With detection Coefficient KtimeCalculate dirtiness resistance value rF, rFComputing formula is：
In described step 1 and step 2, described heat exchanger cold fluid and hot fluid mean temperature difference Δ tmComputing formula be：
In formula, T1It is the exchanger heat side-entrance end hot fluid temperature of the first temperature sensor detection；
T2It is the exchanger heat side outlet end hot fluid temperature of second temperature sensor detection；
tinIt is the heat exchanger cold side import end cooling water temperature of three-temperature sensor detection；
toutFor the 4th temperature sensor is used to detect heat exchanger cold side outlet port end cooling water temperature；
In described step 1 and step 2, the computing formula of described exchanger heat transfer capacity Q is：
Q=Rcp(tin-tout) (2)
In formula, R is the heat exchanger cold side circulating water flow of flowmeter detection；
cpIt is recirculated water specific heat capacity, numerical value is constant, and unit is J/ (kgK)；
tinIt is the heat exchanger cold side import end cooling water temperature of three-temperature sensor detection；
toutIt is the heat exchanger cold side outlet port end cooling water temperature of the 4th temperature sensor detection；
In described step 1 and step 2, the computing formula of described Coefficient K is：
In formula, Q is exchanger heat transfer capacity；F is heat exchanger effective heat exchange area, and unit is m2；ΔtmIt is heat exchanger hot and cold stream
Body mean temperature difference；
Above-mentioned all detection numerical value and evaluation unit all take GB.
Steady Heat Transfer process heat transfer coefficient of the invention and dirtiness resistance value on-line monitoring system and method, compared to existing
Technology, its feature is with advantage：
Firstth, all underlying parameters all from the real-time monitoring to system, really reflect the operation of heat-exchange system
State, has evaded simulation monitor both sides flow, the interference and influence of flow velocity, temperature change on determining, measured heat transfer system
Number and dirtiness resistance value can effecting reaction system really exchange heat situation；
Secondth, due to temperature sensor, flow sensor data sampling very high frequency, can accomplish that real-time monitoring system is transported
Row state, therefore the real time on-line monitoring of system heat transfer coefficient and dirtiness resistance value can be accomplished, so as to evade according to simulation
Heat transfer coefficient and dirtiness resistance value under heat exchanger detection particular state and operate the risk of decision-making.
3rd, due to real time on-line monitoring can be realized, therefore can accumulate to judge system by a large amount of historical datas
The reason for running status changes, is that data basis are established in operation to heat-exchange system steadily in the long term.
4th, the present invention only needs to 4 temperature sensors, 1 flowmeter, and a set of simple processor and display
It is capable of achieving the real time on-line monitoring of heat transfer coefficient and dirtiness resistance value, it is not necessary to proprietary test equipment, low cost, is not required to substantially
Manual maintenance is wanted, all heat exchanger systems can be met, especially the demand of medium-sized and small enterprises and medium and small heat-exchange system, can answered extensively
With.
5th, the system can further be integrated with other systems, be that whole recirculating cooling water system operational management decision-making is carried
Supported for data.
Brief description of the drawings
Fig. 1 is the steady state heat transfer process coefficient of heat transfer of the present invention and dirtiness resistance value real time on-line monitoring system schematic diagram；
In figure, the temperature sensors of 1- first；2- second temperature sensors；3- three-temperature sensors；The temperature of 4- the 4th is passed
Sensor；5- flowmeters；6- central processing units；7- displays.
Fig. 2 is the steady state heat transfer process coefficient of heat transfer of the present invention and dirtiness resistance value realtime on-line monitoring method flow chart.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, the present invention is made with reference to example
Further describe, but example is not as a limitation of the invention.
In following examples, temperature sensor model used：PT100；Flow meter model used：MHC-3000-L2；
Central processing unit model used：SIEMENS-S7-200；Display model used：SIEMENS-6AV6640-0CA11-
0AX0。
Wherein, central processing unit uses STEP 7-Micro/WIN programming softwares, using SIMATIC instruction set, can use ladder
Shape figure (LAD), FBD (FBD) or statement list (STL) programming language.
In following examples, all detection numerical value and evaluation unit all take GB.
Embodiment 1
A kind of steady state heat transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring system, including：First temperature sensor
1st, second temperature sensor 2, three-temperature sensor 3, the 4th temperature sensor 4, flowmeter 5, central processing unit 6 and display
7, its schematic diagram is shown in Fig. 1；
Wherein, the first temperature sensor 1 is arranged on exchanger heat side-entrance end, and second temperature sensor 2 is arranged on heat exchange
Device hot side outlet end, three-temperature sensor 3 is arranged on heat exchanger cold side import end, and the 4th temperature sensor 4 is arranged on heat exchange
Device cold side outlet port end, flowmeter 5, the first temperature sensor 1, second temperature sensor the 2, the 3rd are additionally provided with cold side outlet port end
Temperature sensor 3, the 4th temperature sensor 4 and flowmeter 5 are connected with central processing unit 6, central processing unit 6 also with display
Device 7 is connected.
Described the first temperature sensor 1, second temperature sensor 2, three-temperature sensor 3, the 4th temperature sensor 4
It is wireless connection with the mode that flowmeter 5 is connected with central processing unit 6.
Wherein, the first temperature sensor 1 is used to detect exchanger heat side-entrance end hot fluid temperature, second temperature sensor
2 are used to detect exchanger heat side outlet end hot fluid temperature that three-temperature sensor 3 to be used to detect that heat exchanger cold side import end is cold
But coolant-temperature gage, the 4th temperature sensor 4 is used to detect heat exchanger cold side outlet port end cooling water temperature that flowmeter 5 to be changed for detection
Hot device cold side circulating water flow.
The metering numerical value feeding central processing unit 6 that all temperature sensors and flowmeter are gathered, in central processing unit 6
Heat transfer coefficient and dirtiness resistance value numerical value are obtained after carrying out arrangement calculating, is then shown by display 7.
A kind of steady state heat transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring method, its flow chart are shown in Fig. 2, specific bag
Include following steps：
Step 1：Obtain initial information, calculating benchmark heat transfer coefficient
Original state or heat-exchange system are run after over cleaning in heat-exchange system, and heat exchanger cold side is also without dirt deposition
In the state of, the heat exchanger cold side circulating water flow that the temperature value and flowmeter detected according to each temperature sensor are detected, meter
Calculate heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith exchanger heat transfer capacity Q, according to heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith change
Hot device heat output Q determines Coefficient K, i.e., on the basis of Coefficient K0；
Wherein, heat exchanger cold fluid and hot fluid mean temperature difference Δ tmComputing formula be：
In formula, T1It is the exchanger heat side-entrance end hot fluid temperature of the detection of the first temperature sensor 1；
T2It is the exchanger heat side outlet end hot fluid temperature of the detection of second temperature sensor 2；
tinIt is the heat exchanger cold side import end cooling water temperature of the detection of three-temperature sensor 3；
toutFor the 4th temperature sensor 4 is used to detect heat exchanger cold side outlet port end cooling water temperature；
By calculating heat exchanger cold fluid and hot fluid mean temperature difference Δ tm=15 DEG C；
The computing formula of exchanger heat transfer capacity Q is：
Q=Rcp(tin-tout) (2)
In formula, R is the heat exchanger cold side circulating water flow of flowmeter detection；
cpIt is recirculated water specific heat capacity, numerical value is constant, and unit is J/ (kgK)；
tinIt is the heat exchanger cold side import end cooling water temperature of the detection of three-temperature sensor 3；
toutIt is the heat exchanger cold side outlet port end cooling water temperature of the detection of the 4th temperature sensor 4；
By calculating, exchanger heat transfer capacity Q=1.5 × 106W；
The computing formula of Coefficient K is：
In formula, Q is exchanger heat transfer capacity；F is heat exchanger effective heat exchange area, and unit is m2；ΔtmIt is heat exchanger hot and cold stream
Body mean temperature difference；
Heat exchanger used by the present embodiment is shell pipe type heat exchanger, and the effective hot area of heat exchanger is 1000m2, by meter
Calculate, Baseline baseline Coefficient K0=1000W/m2·℃
Step 2：Detection information is obtained, detection heat transfer coefficient is calculated
According to production needs, after heat exchanger operation, can real-time monitoring each temperature sensor temperature and flowmeter detection
Heat exchanger cold side circulating water flow, according to step 1 formula (1), (2), (3) computational methods, current heat transfer system is calculated in real time
Number, as detects Coefficient Ktime, calculate detection Coefficient KtimeIt is 800W/m2·℃；
Step 3：Calculate dirtiness resistance value
Use benchmark Coefficient K0With detection Coefficient KtimeCalculate dirtiness resistance value rF, rFComputing formula is：
Heat transfer coefficient and dirtiness resistance value r after calculatingFShown by the display 7 of system, read immediately.
Embodiment 2
A kind of steady state heat transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring system, including：First temperature sensor
1st, second temperature sensor 2, three-temperature sensor 3, the 4th temperature sensor 4, flowmeter 5, central processing unit 6 and display
7, its schematic diagram is shown in Fig. 1；
Wherein, the first temperature sensor 1 is arranged on exchanger heat side-entrance end, and second temperature sensor 2 is arranged on heat exchange
Device hot side outlet end, three-temperature sensor 3 is arranged on heat exchanger cold side import end, and the 4th temperature sensor 4 is arranged on heat exchange
Device cold side outlet port end, flowmeter 5, the first temperature sensor 1, second temperature sensor the 2, the 3rd are additionally provided with cold side outlet port end
Temperature sensor 3, the 4th temperature sensor 4 and flowmeter 5 are connected with central processing unit 6, central processing unit 6 also with display
Device 7 is connected.
Described the first temperature sensor 1, second temperature sensor 2, three-temperature sensor 3, the 4th temperature sensor 4
It is wired connection with the mode that flowmeter 5 is connected with central processing unit 6.
Wherein, the first temperature sensor 1 is used to detect exchanger heat side-entrance end hot fluid temperature, second temperature sensor
2 are used to detect exchanger heat side outlet end hot fluid temperature that three-temperature sensor 3 to be used to detect that heat exchanger cold side import end is cold
But coolant-temperature gage, the 4th temperature sensor 4 is used to detect heat exchanger cold side outlet port end cooling water temperature that flowmeter 5 to be changed for detection
Hot device cold side circulating water flow.
The metering numerical value feeding central processing unit 6 that all temperature sensors and flowmeter are gathered, in central processing unit 6
Heat transfer coefficient and dirtiness resistance value numerical value are obtained after carrying out arrangement calculating, is then shown by display 7.
A kind of steady state heat transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring method, its flow chart are shown in Fig. 2, specific bag
Include following steps：
Step 1：Obtain initial information, calculating benchmark heat transfer coefficient
Original state or heat-exchange system are run after over cleaning in heat-exchange system, and heat exchanger cold side is also without dirt deposition
In the state of, the heat exchanger cold side circulating water flow that the temperature value and flowmeter detected according to each temperature sensor are detected, meter
Calculate heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith exchanger heat transfer capacity Q, according to heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith change
Hot device heat output Q determines heat transfer coefficient, i.e., on the basis of Coefficient K0；
Wherein, heat exchanger cold fluid and hot fluid mean temperature difference Δ tmComputing formula be：
In formula, T1It is the exchanger heat side-entrance end hot fluid temperature of the detection of the first temperature sensor 1；
T2It is the exchanger heat side outlet end hot fluid temperature of the detection of second temperature sensor 2；
tinIt is the heat exchanger cold side import end cooling water temperature of the detection of three-temperature sensor 3；
toutFor the 4th temperature sensor 4 is used to detect heat exchanger cold side outlet port end cooling water temperature；
By calculating heat exchanger cold fluid and hot fluid mean temperature difference Δ tm=20 DEG C；
The computing formula of exchanger heat transfer capacity Q is：
Q=Rcp(tin-tout) (2)
In formula, R is the heat exchanger cold side circulating water flow of flowmeter detection；
cpIt is recirculated water specific heat capacity, numerical value is constant, and unit is J/ (kgK)；
tinIt is the heat exchanger cold side import end cooling water temperature of the detection of three-temperature sensor 3；
toutIt is the heat exchanger cold side outlet port end cooling water temperature of the detection of the 4th temperature sensor 4；
By calculating, exchanger heat transfer capacity Q=2 × 107W
The computing formula of Coefficient K is：
In formula, Q is exchanger heat transfer capacity；F is heat exchanger effective heat exchange area, and unit is m2；ΔtmIt is heat exchanger hot and cold stream
Body mean temperature difference；
Heat exchanger used by the present embodiment is plate type heat exchanger, and the effective hot area of heat exchanger is 250m2, by calculating,
Baseline baseline Coefficient K0=4000W/m2·℃；
Step 2：Detection information is obtained, detection heat transfer coefficient is calculated
According to production needs, after heat exchanger operation, can real-time monitoring each temperature sensor temperature and flowmeter detection
Heat exchanger cold side circulating water flow, according to step 1 formula (1), (2), (3) computational methods, calculate current heat transfer coefficient, i.e.,
It is detection Coefficient Ktime, calculate detection Coefficient Ktime=2500W/m2·℃；
Step 3：Calculate dirtiness resistance value
Use benchmark Coefficient K0With detection Coefficient KtimeCalculate dirtiness resistance value rF, rFComputing formula is：
Heat transfer coefficient and dirtiness resistance value r after calculatingFShown by the display 7 of system, read immediately.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (7)
1. a kind of steady state heat transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring system, it is characterised in that the steady state heat transfer
Process heat transfer coefficient and dirtiness resistance value on-line monitoring system include：First temperature sensor, second temperature sensor, the 3rd temperature
Degree sensor, the 4th temperature sensor, flowmeter, central processing unit and display；
Wherein, the first temperature sensor is arranged on exchanger heat side-entrance end, and second temperature sensor is arranged on heat exchanger hot side
The port of export, three-temperature sensor is arranged on heat exchanger cold side import end, and the 4th temperature sensor is arranged on heat exchanger cold side and goes out
Mouthful end, flowmeter is additionally provided with cold side outlet port end, the first temperature sensor, second temperature sensor, three-temperature sensor,
4th temperature sensor and flowmeter are connected with central processing unit, and central processing unit is also connected with display.
2. steady state heat transfer process heat transfer coefficient as claimed in claim 1 and dirtiness resistance value on-line monitoring system, its feature exist
In described the first temperature sensor, second temperature sensor, three-temperature sensor, the 4th temperature sensor and flowmeter
The mode being connected with central processing unit be it is wired or wireless in one kind.
3. steady state heat transfer process heat transfer coefficient as claimed in claim 1 and dirtiness resistance value on-line monitoring system, its feature exist
In the first described temperature sensor is used to detect exchanger heat side-entrance end hot fluid temperature, described second temperature sensing
Device is used to detect exchanger heat side outlet end hot fluid temperature that described three-temperature sensor to be used to detect that heat exchanger cold side is entered
Mouth end cooling water temperature, the 4th described temperature sensor is used to detect heat exchanger cold side outlet port end cooling water temperature, described
Flowmeter is used to detect heat exchanger cold side circulating water flow；
The metering numerical value feeding central processing unit that all temperature sensors and flowmeter are gathered, is carried out whole in central processing unit
Reason obtains heat transfer coefficient and dirtiness resistance value numerical value after calculating, and is then shown by display.
4. a kind of steady state heat transfer process heat transfer coefficient and dirtiness resistance value on-line monitoring method, using described in claim 1
Line monitoring system, it is characterised in that comprise the following steps：
Step 1：Obtain initial information, calculating benchmark heat transfer coefficient
In heat-exchange system operation original state or heat-exchange system after over cleaning, the heat exchanger cold side also shape without dirt deposition
Under state, the heat exchanger cold side circulating water flow that the temperature value and flowmeter detected according to each temperature sensor are detected, calculating is changed
Hot device cold fluid and hot fluid mean temperature difference Δ tmWith exchanger heat transfer capacity Q, according to heat exchanger cold fluid and hot fluid mean temperature difference Δ tmAnd heat exchanger
Heat output Q determine Coefficient K, i.e., on the basis of Coefficient K0；
Step 2：Detection information is obtained, detection heat transfer coefficient is calculated
According to production needs, after heat exchanger operation, can the temperature of real-time monitoring each temperature sensor and changing for flowmeter detection
Hot device cold side circulating water flow, calculates heat exchanger cold fluid and hot fluid mean temperature difference Δ tmWith exchanger heat transfer capacity Q, calculate in real time current
Coefficient K, as detects Coefficient Ktime；
Step 3：Calculate dirtiness resistance value
Use benchmark Coefficient K0With detection Coefficient KtimeCalculate dirtiness resistance value rF, rFComputing formula is：
5. steady state heat transfer process heat transfer coefficient as claimed in claim 4 and dirtiness resistance value on-line monitoring method, its feature exist
In, in described step 1 and step 2, described heat exchanger cold fluid and hot fluid mean temperature difference Δ tmComputing formula be：
In formula, T1It is the exchanger heat side-entrance end hot fluid temperature of the first temperature sensor detection；
T2It is the exchanger heat side outlet end hot fluid temperature of second temperature sensor detection；
tinIt is the heat exchanger cold side import end cooling water temperature of three-temperature sensor detection；
toutFor the 4th temperature sensor is used to detect heat exchanger cold side outlet port end cooling water temperature.
6. steady state heat transfer process heat transfer coefficient as claimed in claim 4 and dirtiness resistance value on-line monitoring method, its feature exist
In in described step 1 and step 2, the computing formula of described exchanger heat transfer capacity Q is：
Q=Rcp(tin-tout) (2)
In formula, R is the heat exchanger cold side circulating water flow of flowmeter detection；
cpIt is recirculated water specific heat capacity, numerical value is constant, and unit is J/ (kgK)；
tinIt is the heat exchanger cold side import end cooling water temperature of three-temperature sensor detection；
toutIt is the heat exchanger cold side outlet port end cooling water temperature of the 4th temperature sensor detection.
7. steady state heat transfer process heat transfer coefficient as claimed in claim 4 and dirtiness resistance value on-line monitoring method, its feature exist
In in described step 1 and step 2, the computing formula of described Coefficient K is：
In formula, Q is exchanger heat transfer capacity；F is heat exchanger effective heat exchange area, and unit is m2；ΔtmFor heat exchanger cold fluid and hot fluid is flat
Mean temperature difference.
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| CN111279145A (en) * | 2017-09-19 | 2020-06-12 | 埃科莱布美国股份有限公司 | Cooling water monitoring and control system |
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| CN113190924B (en) * | 2021-03-26 | 2024-01-23 | 中煤鄂尔多斯能源化工有限公司 | Modeling and scaling analysis method and system for circulating water system of coal chemical industry enterprise |
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