CN101126614A - Heat exchanger heat transfer capacity adjusting method - Google Patents
Heat exchanger heat transfer capacity adjusting method Download PDFInfo
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- CN101126614A CN101126614A CNA2007100501861A CN200710050186A CN101126614A CN 101126614 A CN101126614 A CN 101126614A CN A2007100501861 A CNA2007100501861 A CN A2007100501861A CN 200710050186 A CN200710050186 A CN 200710050186A CN 101126614 A CN101126614 A CN 101126614A
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Abstract
The utility model relates to a heat-transfer adjusting method for heat exchanger, which is characterized in that the temperature of the outlets of cold source fluid and hot source fluid after heat exchange in the heat exchanger complies with the design requirement by the harmonization of the following two aspects: (1) partial cold source fluid or hot source fluid flowed out from the outlet of hot source fluid or cold source fluid after heat exchange is pressurized to reach the design requirement by a pressurization device and then returns to the pipeline at the inlet of the cold source fluid or hot source fluid of the heat exchanger, thereby mixing with flesh cold source fluid or hot source fluid to enter the heat exchanger for heat exchange; (2) the flux of the cold source fluid or hot source fluid entering the heat exchanger is adjusted. The utility model has the advantages that the method can avoid the problem of scaling, solidification, metamorphosis and corrosion resulted from over-high temperature at the outlet of cold source fluid or over-low temperature at the outlet of hot source fluid.
Description
Technical field
The invention belongs to the control method of heat exchanger heat transfer amount, particularly low-temperature receiver body and heat source body are the control method of the heat exchanger heat transfer amount of sensitive medium.
Background technology
In the heat exchanging process of Chemical Manufacture, traditional control method of heat output is to realize by the flow through heat source body or the low-temperature receiver body flow of heat exchanger of adjusting.But, when heat source body, when two kinds of fluids of low-temperature receiver body are temperature sensitive material, use traditional control method then can cause the low-temperature receiver body of outflow heat exchanger overheated or heat source body is cold excessively, thereby make exchanger tube wall fouling, curing, rotten, corrosion, reduce rate of heat transfer, outage even device damage.For example, the heat exchanger that uses in the urea production, heat source body are CO
2, the low-temperature receiver body is a water, in the time of in the winter time, along with temperature descends, the heat exchanger entrance cooling water temperature descends, if use traditional control method of heat output, then is to reduce cooling water flow, but the decline of cooling water amount then can make cooling water outlet temperature rise, and surpasses the outlet temperature of design.Along with water temperature raises, because the scale-forming ion solubility product reduces, " baking " effect, and the reduction of anti-fouling agent activity, scale velocity increases severely, and because of fouling causes the enrichment of CL-, thereby cause stress corrosion, cause heat exchanger to damage (large-scale chemical fertilizer plant has a lot of such cases), even if the large chemical fertilizer device of the up-to-date introduction of China is also failed head it off (seeing in February, 2007) the 39th page of " big nitrogenous fertilizer " the 30th the 1st phase of volume.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide new method-heat exchanger entrance end heat source body that a kind of heat exchanger heat transfer amount regulates or low-temperature receiver body temperature degree, coordinating flow quantity to regulate method.This kind method can not only reduce the dirt in the heat exchanger, delays fouling, and small investment, and is simple to operate, stable and reliable operation.
The control method of heat exchanger heat transfer amount of the present invention, the cooperation by following two aspects adhere to specification the low-temperature receiver body that carries out after the heat exchange and the outlet temperature of heat source body in heat exchanger:
(1) will from the low-temperature receiver body of heat exchanger or heat source body outlet flow out carry out low-temperature receiver body after the heat exchange or the part of heat source body is back to the low-temperature receiver body of heat exchanger or the pipeline of heat source body porch with its boost in pressure by supercharging device to the pressure that adheres to specification, and enter heat exchanger after fresh low-temperature receiver body or heat source body mix and carry out heat exchange;
(2) adjust the flow that fresh low-temperature receiver body or heat source body enter heat exchanger.
Said method has four kinds of concrete forms:
1, the part of carrying out the low-temperature receiver body after the heat exchange that will flow out from the outlet of the low-temperature receiver body of heat exchanger is back to the pipeline of the low-temperature receiver body porch of heat exchanger by supercharging device to the pressure that adheres to specification with its boost in pressure, and enters heat exchanger after fresh low-temperature receiver body mixes and carries out heat exchange; Adjust the flow that fresh low-temperature receiver body enters heat exchanger.This kind form is called for short " low-temperature receiver body circulation-fresh low-temperature receiver body Flow-rate adjustment ".
2, the part of carrying out the heat source body after the heat exchange that will flow out from the outlet of the heat source body of heat exchanger is back to the pipeline of the heat source body porch of heat exchanger by supercharging device to the pressure that adheres to specification with its boost in pressure, and enters heat exchanger after fresh heat source body mixes and carries out heat exchange; Adjust the flow that fresh heat source body enters heat exchanger.This kind form is called for short " heat source body circulation-fresh heat source body Flow-rate adjustment ".
3, the part of carrying out the low-temperature receiver body after the heat exchange that will flow out from the outlet of the low-temperature receiver body of heat exchanger is back to the pipeline of the low-temperature receiver body porch of heat exchanger by supercharging device to the pressure that adheres to specification with its boost in pressure, and enters heat exchanger after fresh low-temperature receiver body mixes and carries out heat exchange; Adjust the flow that fresh heat source body enters heat exchanger.This kind form is called for short " low-temperature receiver body circulation-fresh heat source body Flow-rate adjustment ".
4, the part of carrying out the heat source body after the heat exchange that will flow out from the outlet of the heat source body of heat exchanger is back to the pipeline of the heat source body porch of heat exchanger by supercharging device to the pressure that adheres to specification with its boost in pressure, and enters heat exchanger after fresh heat source body mixes and carries out heat exchange; Adjust the flow that fresh low-temperature receiver body enters heat exchanger.This kind form is called for short " heat source body circulation-fresh low-temperature receiver body Flow-rate adjustment ".
In the said method, carrying out flow that the amount of low-temperature receiver body that low-temperature receiver body after the heat exchange or heat source body be back to heat exchanger or heat source body porch and fresh low-temperature receiver body or heat source body enter heat exchanger is that benchmark is adjusted with the outlet design temperature of low-temperature receiver body and heat source body.
Carry out the amount of low-temperature receiver body that low-temperature receiver body after the heat exchange or heat source body be back to heat exchanger or heat source body porch and fresh low-temperature receiver body or heat source body and enter the flow of heat exchanger, can adopt manual mode or automatic control mode adjustment.If adopt manual mode, adjust the aperture that low-temperature receiver body or heat source body return adjustable valve and fresh low-temperature receiver body or heat source body inlet flow rate control valve by operating personnel and realize.If adopt automatic control mode, adjust the aperture realization that low-temperature receiver body or heat source body return the aperture of adjustable valve and adjust fresh low-temperature receiver body or heat source body inlet flow rate control valve by fresh low-temperature receiver body or heat source body inlet flow rate regulation device automatically automatically by low-temperature receiver body or the heat source body amount of returning regulation device.
The method of the invention is suitable for the adjusting of the heat exchanging process heat output of all temperature sensitive materials, also can be used for the adjusting of the heat exchanging process heat output of ordinary matter.
The present invention has following beneficial effect:
1, the method for the invention has guaranteed the low-temperature receiver body temperature degree and the heat source body controlled temperature of outflow heat exchanger, and can be controlled at suitable limit range, therefore solved in the heat exchanging process heat source body outlet temperature and crossed problems such as the low fouling that causes or/and low-temperature receiver body outlet temperature is too high, curing, rotten, corrosion, heat exchanger can normally be moved for a long time.
2, the method for the invention is if adopt manual mode to adjust the aperture of valve, only need on the existing equipment basis, to increase a supercharging device and a small amount of connecting tube, valve, adjust the aperture of valve if adopt automatic control mode, only need on the basis of manual mode, to increase by two device for automatically regulating, thereby small investment, equipment takes up an area of little, easy construction.
3, supercharging device of the present invention, control valve, device for automatically regulating etc. are the market general goods, and buying is convenient, is easy to obtain.
Description of drawings
Fig. 1 is first kind of process chart of heat exchanger heat transfer amount adjustment method of the present invention, and this figure has also shown the annexation of heat exchanger and each member or device in the heat-exchange system.
Fig. 2 is second kind of process chart of heat exchanger heat transfer amount adjustment method of the present invention, and this figure has also shown the annexation of heat exchanger and each member or device in the heat-exchange system.
Fig. 3 is the third process chart of heat exchanger heat transfer amount adjustment method of the present invention, and this figure has also shown the annexation of heat exchanger and each member or device in the heat-exchange system.
Fig. 4 is the 4th kind of process chart of heat exchanger heat transfer amount adjustment method of the present invention, and this figure has also shown the annexation of heat exchanger and each member or device in the heat-exchange system.
Fig. 5 is the structured flowchart of low-temperature receiver body of the present invention or the heat source body amount of returning regulation device.
Fig. 6 is the structured flowchart of fresh low-temperature receiver body of the present invention or heat source body inlet flow rate regulation device.
Among the figure, 1-heat exchanger, 2-supercharging device, 3-circulation pipe, 4-low-temperature receiver body or heat source body return adjustable valve, the fresh low-temperature receiver body of 5-or heat source body inlet flow rate control valve, 6-low-temperature receiver body or the heat source body amount of returning regulation device, the fresh low-temperature receiver body of 7-or heat source body inlet flow rate regulation device, 8-temperature sensor, 9-adjuster, 10-temperature sensor, 11-adjuster.
The specific embodiment
The heat-exchange system of present embodiment is used for urea production CO
2The cooling of gas.The low-temperature receiver body is a water, design inlet pressure 0.3Mpa, 32 ℃ of design inlet temperatures, 42 ℃ of design outlet temperatures, 45 ℃ of the highest outlet temperatures of permission; Heat source body is CO
2, design inlet pressure 7.6MPa, 160 ℃ of design inlet temperatures, 43 ℃ of design outlet temperatures, 35 ℃ of the minimum outlet temperatures of permission.26 ℃ of the fresh cooling water minimum temperatures of prediction, the fresh CO of prediction
2170 ℃ of minimum temperatures, the fresh CO of prediction
2Minimum flow 28000m
3/ h.
Present embodiment has adopted heat-exchange system shown in Figure 1, i.e. low-temperature receiver body circulation and the two control of fresh low-temperature receiver body Flow-rate adjustment heat-exchange system.This heat-exchange system comprises that heat exchanger 1, supercharging device 2, low-temperature receiver body return adjustable valve 4, fresh low-temperature receiver body inlet flow rate control valve 5, the low-temperature receiver body amount of returning regulation device 6 and fresh low-temperature receiver body inlet flow rate regulation device 7.The heat transfer coefficient of heat exchanger 1 is 38W/m
2℃, heat transfer area is 210m
2Supercharging device 2 is a centrifugal pump, and its maximum stream flow is according to CO
2The minimum outlet temperature (35 ℃) that allows, the highest outlet temperature (45 ℃) that cooling water allows, the heat transfer coefficient of heat exchanger, the heat transfer area of heat exchanger, the fresh cooling water minimum temperature (26 ℃) of prediction, the fresh CO of prediction
2Minimum flow (28000m
3/ h), the prediction fresh CO
2Minimum temperature technological parameters such as (170 ℃), (computational methods are seen " chemical engineers handbook "/Yuan Yi chief editor to separate acquisition by rate of heat transfer equation and energy-balance equation connection, chemical engineers handbook editorial board compiles, China Machine Press, 1999.10), in the present embodiment, calculate the largest loop flow 100m of gained centrifugal pump
3/ h, and carry out the type selecting of centrifugal pump in view of the above, the model of selected centrifugal pump is LS125-100-315.The low-temperature receiver body returns adjustable valve 4, fresh low-temperature receiver body inlet flow rate control valve 5 is the barrier film control valve.
In the heat-exchange system, the annexation of heat exchanger and each member or device: the import of supercharging device (centrifugal pump) 2 links to each other by circulation pipe 3 and the pipeline that is connected the low-temperature receiver body outlet of heat exchanger 1, and its outlet is continuous with the pipeline of the fresh low-temperature receiver body import that is connected heat exchanger 1 by circulation pipe 3; The low-temperature receiver body returns adjustable valve 4 and is arranged on supercharging device 2 export pipelines, and fresh low-temperature receiver body inlet flow rate control valve 5 is arranged on the inlet ductwork of fresh low-temperature receiver body; The low-temperature receiver body amount of returning regulation device 6 comprises temperature sensor 8 and adjuster 9, and (structure and annexation are as shown in Figure 5, the adjuster model is DSC40B), temperature sensor 8 is arranged on the low-temperature receiver body exit of heat exchanger 1, its output is connected with the input of adjuster 9, convert detected low-temperature receiver body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster 9 returns adjustable valve 4 with the low-temperature receiver body and is connected, and adjusts the aperture that the low-temperature receiver body returns adjustable valve 4 according to the low-temperature receiver body outlet temperature signal that receives; Fresh low-temperature receiver body inlet flow rate regulation device 7 comprises temperature sensor 10 and adjuster 11, and (structure and annexation are as shown in Figure 6, the adjuster model is DSC40B), temperature sensor 10 is arranged on the heat source body exit of heat exchanger 1, its output is connected with the input of adjuster 11, convert detected heat source body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster 11 is connected with fresh low-temperature receiver body inlet flow rate control valve 5, adjusts the aperture of fresh low-temperature receiver body inlet flow rate control valve 5 according to the heat source body outlet temperature signal that receives.
During use, according to the CO of temperature sensor demonstration
2Outlet temperature and cooling water outlet temperature are manually controlled fresh low-temperature receiver body inlet flow rate control valve 5 or/and the low-temperature receiver body returns the aperture of adjustable valve 4, will go out the CO of heat exchanger
2Temperature is controlled at 40～43 ℃, and the coolant-temperature gage that goes out heat exchanger is controlled at 42～44 ℃.After system is stable, drop into control automatically, fresh low-temperature receiver body inlet flow rate regulation device 7, the low-temperature receiver body amount of returning regulation device 6 are according to the CO of heat exchanger
2The outlet temperature signal of telecommunication and the cooling water outlet temperature signal of telecommunication are controlled fresh low-temperature receiver body inlet flow rate control valve 5 automatically or/and the low-temperature receiver body returns the aperture of adjustable valve 4, will go out the CO of heat exchanger
2Temperature is controlled at 40～43 ℃, and the coolant-temperature gage that goes out heat exchanger is controlled at 42～44 ℃.
The heat-exchange system of present embodiment is used for the cooling of formalin.The low-temperature receiver body is a water, design inlet pressure 0.3Mpa, 32 ℃ of design inlet temperatures, 42 ℃ of design outlet temperatures, 45 ℃ of the highest outlet temperatures of permission; Heat source body is a formalin, design inlet pressure 0.6MPa, 70 ℃ of design inlet temperatures, 40 ℃ of design outlet temperatures, 35 ℃ of the minimum outlet temperatures of permission.26 ℃ of the fresh cooling water minimum temperatures of prediction, the constant 200m of fresh cooling water flow
3/ h, 70 ℃ of the fresh formalin temperature constant of prediction.
Present embodiment has adopted heat-exchange system shown in Figure 2, i.e. heat source body circulation and the two control of fresh heat source body Flow-rate adjustment heat-exchange system.This heat-exchange system comprises that heat exchanger 1, supercharging device 2, heat source body return adjustable valve 4, fresh heat source body inlet flow rate control valve 5, the heat source body amount of returning regulation device 6 and fresh heat source body inlet flow rate regulation device 7.The heat transfer coefficient of heat exchanger 1 is 1300w/m
2. ℃, heat transfer area is 100m
2Supercharging device 2 is a centrifugal pump, the minimum outlet temperature (35 ℃) that its maximum stream flow allows according to formalin, the highest outlet temperature (45 ℃) that cooling water allows, the heat transfer coefficient of heat exchanger, the heat transfer area of heat exchanger, the fresh cooling water minimum temperature (26 ℃) of prediction, the fresh cooling water flow (200m of prediction
3/ h), the prediction fresh formalin temperature technological parameters such as (70 ℃), (computational methods are seen " chemical engineers handbook "/Yuan Yi chief editor to separate acquisition by rate of heat transfer equation and energy-balance equation connection, chemical engineers handbook editorial board compiles, China Machine Press, 1999.10), in the present embodiment, calculate the largest loop flow 70m of gained centrifugal pump
3/ h, and carry out the type selecting of centrifugal pump in view of the above, the model of selected centrifugal pump is LS100-80-160.Heat source body returns adjustable valve 4, fresh heat source body inlet flow rate control valve 5 is the barrier film control valve.
In the heat-exchange system, the annexation of heat exchanger and each member or device: the import of supercharging device (centrifugal pump) 2 links to each other by circulation pipe 3 and the pipeline that is connected the heat source body outlet of heat exchanger 1, and its outlet is continuous with the pipeline of the fresh heat source body import that is connected heat exchanger 1 by circulation pipe 3; Heat source body returns adjustable valve 4 and is arranged on supercharging device 2 export pipelines, and fresh heat source body inlet flow rate control valve 5 is arranged on the inlet ductwork of fresh heat source body; The heat source body amount of returning regulation device 6 comprises temperature sensor 8 and adjuster 9, and (structure and annexation are as shown in Figure 5, the adjuster model is DSC40B), temperature sensor 8 is arranged on the heat source body exit of heat exchanger 1, its output is connected with the input of adjuster, convert detected heat source body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster 9 returns adjustable valve 4 with heat source body and is connected, and adjusts the aperture that heat source body returns adjustable valve 4 according to the heat source body outlet temperature signal that receives; Fresh heat source body inlet flow rate regulation device 7 comprises temperature sensor 10 and adjuster 11, and (structure and annexation are as shown in Figure 6, the adjuster model is DSC40B), temperature sensor 10 is arranged on the low-temperature receiver body exit of heat exchanger, its output is connected with the input of adjuster, convert detected low-temperature receiver body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster is connected with fresh heat source body inlet flow rate control valve 5, adjusts the aperture of fresh heat source body inlet flow rate control valve 5 according to the low-temperature receiver body outlet temperature signal that receives.
During use, formalin outlet temperature and cooling water outlet temperature according to the temperature sensor demonstration, manually the control heat source body returns adjustable valve 4 or/and the aperture of fresh heat source body inlet flow rate control valve 5, the formalin temperature that will go out heat exchanger is controlled at 38～40 ℃, and the coolant-temperature gage that goes out heat exchanger is controlled at 42～44 ℃.After system is stable, drop into control automatically, the heat source body amount of returning regulation device 6, fresh heat source body inlet flow rate regulation device 7 are according to the formalin outlet temperature signal of telecommunication and the cooling water outlet temperature signal of telecommunication of heat exchanger, automatically the control heat source body returns adjustable valve 4 or/and the aperture of fresh heat source body inlet flow rate control valve 5, the formalin temperature that will go out heat exchanger is controlled at 38～40 ℃, and the coolant-temperature gage that goes out heat exchanger is at 42～44 ℃.
The heat-exchange system of present embodiment is used for the cooling of formalin.The low-temperature receiver body is a water, design inlet pressure 0.3Mpa, 32 ℃ of design inlet temperatures, 42 ℃ of design outlet temperatures, 45 ℃ of the highest outlet temperatures of permission; Heat source body is a formalin, design inlet pressure 0.6MPa, 70 ℃ of design inlet temperatures, 40 ℃ of design outlet temperatures, 35 ℃ of the minimum outlet temperatures of permission.26 ℃ of the fresh cooling water minimum temperatures of prediction, the constant 200m of fresh cooling water flow
3/ h, 70 ℃ of the fresh formalin temperature constant of prediction.
Present embodiment has adopted heat-exchange system shown in Figure 3, i.e. low-temperature receiver body circulation and the two control of fresh heat source body Flow-rate adjustment heat-exchange system.This heat-exchange system comprises that heat exchanger 1, supercharging device 2, low-temperature receiver body return adjustable valve 4, fresh heat source body inlet flow rate control valve 5, the low-temperature receiver body amount of returning regulation device 6 and fresh heat source body inlet flow rate regulation device 7.The heat transfer coefficient of heat exchanger 1 is 1300w/m
2. ℃, heat transfer area is 100m
2Supercharging device 2 is a centrifugal pump, the minimum outlet temperature (35 ℃) that its maximum stream flow allows according to formalin, the highest outlet temperature (45 ℃) that cooling water allows, the heat transfer coefficient of heat exchanger, the heat transfer area of heat exchanger, the fresh cooling water minimum temperature (26 ℃) of prediction, the fresh cooling water flow (200m of prediction
3/ h), the prediction fresh formalin temperature technological parameters such as (70 ℃), (computational methods are seen " chemical engineers handbook "/Yuan Yi chief editor to separate acquisition by rate of heat transfer equation and energy-balance equation connection, chemical engineers handbook editorial board compiles, China Machine Press, 1999.10), in the present embodiment, calculate the largest loop flow 70m of gained centrifugal pump
3/ h, and carry out the type selecting of centrifugal pump in view of the above, the model of selected centrifugal pump is LS100-80-160.The low-temperature receiver body returns adjustable valve 4, fresh heat source body inlet flow rate control valve 5 is the barrier film control valve.
In the heat-exchange system, the annexation of heat exchanger and each member or device: the import of supercharging device (centrifugal pump) 2 links to each other by circulation pipe 3 and the pipeline that is connected the low-temperature receiver body outlet of heat exchanger 1, and its outlet is continuous with the pipeline of the fresh low-temperature receiver body import that is connected heat exchanger 1 by circulation pipe 3; The low-temperature receiver body returns adjustable valve 4 and is arranged on supercharging device 2 export pipelines, and fresh heat source body inlet flow rate control valve 5 is arranged on the inlet ductwork of fresh heat source body; The low-temperature receiver body amount of returning regulation device 6 comprises temperature sensor 8 and adjuster 9, and (structure and annexation are as shown in Figure 5, the adjuster model is DSC40B), temperature sensor 8 is arranged on the low-temperature receiver body exit of heat exchanger, its output is connected with the input of adjuster, convert detected low-temperature receiver body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster returns adjustable valve 4 with the low-temperature receiver body and is connected, and adjusts the aperture that heat source body returns adjustable valve 4 according to the low-temperature receiver body outlet temperature signal that receives; Fresh heat source body inlet flow rate regulation device 7 comprises temperature sensor 10 and adjuster 11, and (structure and annexation are as shown in Figure 6, the adjuster model is DSC40B), temperature sensor 10 is arranged on the heat source body exit of heat exchanger 1, its output is connected with the input of adjuster, convert detected heat source body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster 11 is connected with fresh heat source body inlet flow rate control valve 5, adjusts the aperture of fresh heat source body inlet flow rate control valve 5 according to the heat source body outlet temperature signal that receives.
During use, formalin outlet temperature and cooling water outlet temperature according to the temperature sensor demonstration, manually control low-temperature receiver body returns adjustable valve 4 or/and the aperture of fresh heat source body inlet flow rate control valve 5, the formalin temperature that will go out heat exchanger is controlled at 38～40 ℃, and the coolant-temperature gage that goes out heat exchanger is controlled at 42～44 ℃.After system is stable, drop into control automatically, the low-temperature receiver body amount of returning regulation device 6, fresh heat source body inlet flow rate regulation device 7 are according to the formalin outlet temperature signal of telecommunication and the cooling water outlet temperature signal of telecommunication of heat exchanger, automatically control low-temperature receiver body returns adjustable valve 4 or/and the aperture of fresh heat source body inlet flow rate control valve 5, the formalin temperature that will go out heat exchanger is controlled at 38～40 ℃, and the coolant-temperature gage that goes out heat exchanger is at 42～44 ℃.
The heat-exchange system of present embodiment is used for the cooling of formalin.The low-temperature receiver body is a water, design inlet pressure 0.3MPa, 32 ℃ of design inlet temperatures, 42 ℃ of design outlet temperatures, 45 ℃ of the highest outlet temperatures of permission; Heat source body is a formalin, design inlet pressure 0.6MPa, 70 ℃ of design inlet temperatures, 40 ℃ of design outlet temperatures, 35 ℃ of the minimum outlet temperatures of permission.26 ℃ of the fresh cooling water minimum temperatures of prediction, 70 ℃ of the fresh formalin temperature constant of prediction, the fresh formalin flow 150m of prediction
3/ h.
Present embodiment has adopted heat-exchange system shown in Figure 4, i.e. heat source body circulation and the two control of fresh low-temperature receiver body Flow-rate adjustment heat-exchange system.This heat-exchange system comprises that heat exchanger 1, supercharging device 2, heat source body return adjustable valve 4, fresh low-temperature receiver body inlet flow rate control valve 5, the heat source body amount of returning regulation device 6 and fresh low-temperature receiver body inlet flow rate regulation device 7.The heat transfer coefficient of heat exchanger 1 is 1300w/m
2. ℃, heat transfer area is 100m
2Supercharging device 2 is a centrifugal pump, the minimum outlet temperature (35 ℃) that its maximum stream flow allows according to formalin, the highest outlet temperature (45 ℃) that cooling water allows, the heat transfer coefficient of heat exchanger, the heat transfer area of heat exchanger, the fresh cooling water minimum temperature (26 ℃) of prediction, the fresh formalin temperature (70 ℃) of prediction, the fresh formalin flow (150m of prediction
3/ h) wait technological parameter, (computational methods are seen " chemical engineers handbook "/Yuan Yi chief editor to separate acquisition by rate of heat transfer equation and energy-balance equation connection, chemical engineers handbook editorial board compiles, China Machine Press, 1999.10), in the present embodiment, calculate the largest loop flow 70m of gained centrifugal pump
3/ h, and carry out the type selecting of centrifugal pump in view of the above, the model of selected centrifugal pump is LS100-80-160.Heat source body returns adjustable valve 4, fresh low-temperature receiver body inlet flow rate control valve 5 is the barrier film control valve.
In the heat-exchange system, the annexation of heat exchanger and each member or device: the import of supercharging device (centrifugal pump) 2 links to each other by circulation pipe 3 and the pipeline that is connected the heat source body outlet of heat exchanger 1, and its outlet is continuous with the pipeline of the fresh heat source body import that is connected heat exchanger 1 by circulation pipe 3; Heat source body returns adjustable valve 4 and is arranged on supercharging device 2 export pipelines, and fresh low-temperature receiver body inlet flow rate control valve 5 is arranged on the inlet ductwork of fresh low-temperature receiver body; The heat source body amount of returning regulation device 6 comprises temperature sensor 8 and adjuster 9, and (structure and annexation are as shown in Figure 5, the adjuster model is DSC40B), temperature sensor 8 is arranged on the heat source body exit of heat exchanger 1, its output is connected with the input of adjuster 9, convert detected heat source body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster returns adjustable valve 4 with heat source body and is connected, and adjusts the aperture that heat source body returns adjustable valve 4 according to the heat source body outlet temperature signal that receives; Fresh low-temperature receiver body inlet flow rate regulation device 7 comprises temperature sensor 10 and adjuster 11, and (structure and annexation are as shown in Figure 6, the adjuster model is DSC40B), temperature sensor 10 is arranged on the low-temperature receiver body exit of heat exchanger 1, its output is connected with the input of adjuster 11, convert detected low-temperature receiver body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster 11 is connected with fresh low-temperature receiver body inlet flow rate control valve 5, adjusts the aperture of fresh low-temperature receiver body inlet flow rate control valve 5 according to the low-temperature receiver body outlet temperature signal that receives.
During use, formalin outlet temperature and cooling water outlet temperature according to the temperature sensor demonstration, manually the control heat source body returns adjustable valve 4 or/and the aperture of fresh low-temperature receiver body inlet flow rate control valve 5, the formalin temperature that will go out heat exchanger is controlled at 38～40 ℃, and the coolant-temperature gage that goes out heat exchanger is controlled at 42～44 ℃.After system is stable, drop into control automatically, the heat source body amount of returning regulation device 6, fresh low-temperature receiver body inlet flow rate regulation device 7 are according to the formalin outlet temperature signal of telecommunication and the cooling water outlet temperature signal of telecommunication of heat exchanger, automatically the control heat source body returns adjustable valve 4 or/and the aperture of fresh low-temperature receiver body inlet flow rate control valve 5, the formalin temperature that will go out heat exchanger is controlled at 38～40 ℃, and the coolant-temperature gage that goes out heat exchanger is at 42～44 ℃.
Claims (10)
1. the control method of a heat exchanger heat transfer amount is characterized in that the cooperation of this method by following two aspects adheres to specification the low-temperature receiver body that carries out after the heat exchange and the outlet temperature of heat source body in heat exchanger:
(1) will from the low-temperature receiver body of heat exchanger or heat source body outlet flow out carry out low-temperature receiver body after the heat exchange or the part of heat source body is back to the low-temperature receiver body of heat exchanger or the pipeline of heat source body porch with its boost in pressure by supercharging device to the pressure that adheres to specification, with enter heat exchanger after fresh low-temperature receiver body or heat source body mix and carry out heat exchange
(2) adjust the flow that fresh low-temperature receiver body or heat source body enter heat exchanger.
2. the control method of heat exchanger heat transfer amount according to claim 1 is characterized in that cooperation by following two aspects adheres to specification the low-temperature receiver body that carries out after the heat exchange and the outlet temperature of heat source body in heat exchanger:
(1) part of carrying out the low-temperature receiver body after the heat exchange that will flow out from the outlet of the low-temperature receiver body of heat exchanger is back to its boost in pressure to the pressure that adheres to specification the pipeline of the low-temperature receiver body porch of heat exchanger by supercharging device, with enter heat exchanger after fresh low-temperature receiver body mixes and carry out heat exchange
(2) adjust the flow that fresh low-temperature receiver body enters heat exchanger.
3. the control method of heat exchanger heat transfer amount according to claim 1 is characterized in that cooperation by following two aspects adheres to specification the low-temperature receiver body that carries out after the heat exchange and the outlet temperature of heat source body in heat exchanger:
(1) part of carrying out the heat source body after the heat exchange that will flow out from the outlet of the heat source body of heat exchanger is back to its boost in pressure to the pressure that adheres to specification the pipeline of the heat source body porch of heat exchanger by supercharging device, with enter heat exchanger after fresh heat source body mixes and carry out heat exchange
(2) adjust the flow that fresh heat source body enters heat exchanger.
4. the control method of heat exchanger heat transfer amount according to claim 1 is characterized in that cooperation by following two aspects adheres to specification the low-temperature receiver body that carries out after the heat exchange and the outlet temperature of heat source body in heat exchanger:
(1) part of carrying out the low-temperature receiver body after the heat exchange that will flow out from the outlet of the low-temperature receiver body of heat exchanger is back to its boost in pressure to the pressure that adheres to specification the pipeline of the low-temperature receiver body porch of heat exchanger by supercharging device, with enter heat exchanger after fresh low-temperature receiver body mixes and carry out heat exchange
(2) adjust the flow that fresh heat source body enters heat exchanger.
5. the control method of heat exchanger heat transfer amount according to claim 1 is characterized in that cooperation by following two aspects adheres to specification the low-temperature receiver body that carries out after the heat exchange and the outlet temperature of heat source body in heat exchanger:
(1) part of carrying out the heat source body after the heat exchange that will flow out from the outlet of the heat source body of heat exchanger is back to its boost in pressure to the pressure that adheres to specification the pipeline of the heat source body porch of heat exchanger by supercharging device, with enter heat exchanger after fresh heat source body mixes and carry out heat exchange
(2) adjust the flow that fresh low-temperature receiver body enters heat exchanger.
6. according to the control method of the described heat exchanger heat transfer amount of arbitrary claim in the claim 1 to 5, it is characterized in that carrying out flow that the amount of low-temperature receiver body that low-temperature receiver body after the heat exchange or heat source body be back to heat exchanger or heat source body porch and fresh low-temperature receiver body or heat source body enter heat exchanger is that benchmark is adjusted with the outlet design temperature of low-temperature receiver body and heat source body.
7. the control method of heat exchanger heat transfer amount according to claim 6, it is characterized in that carrying out the flow that the amount of low-temperature receiver body that low-temperature receiver body after the heat exchange or heat source body be back to heat exchanger or heat source body porch and fresh low-temperature receiver body or heat source body enter heat exchanger and adopt the manual mode adjustment, promptly adjust the aperture that low-temperature receiver body or heat source body return adjustable valve (4) and fresh low-temperature receiver body or heat source body inlet flow rate control valve (5) and realize by operating personnel.
8. the control method of heat exchanger heat transfer amount according to claim 6, it is characterized in that carrying out the flow that the amount of low-temperature receiver body that low-temperature receiver body after the heat exchange or heat source body be back to heat exchanger or heat source body porch and fresh low-temperature receiver body or heat source body enter heat exchanger and adopt the automatic control mode adjustment, promptly adjust the aperture realization that low-temperature receiver body or heat source body return the aperture of adjustable valve (4) and adjust fresh low-temperature receiver body or heat source body inlet flow rate control valve (5) by fresh low-temperature receiver body or heat source body inlet flow rate regulation device (7) automatically automatically by low-temperature receiver body or the heat source body amount of returning regulation device (6).
9. the control method of heat exchanger heat transfer amount according to claim 8 is characterized in that low-temperature receiver body or the heat source body amount of returning regulation device (6) comprise temperature sensor (8) and adjuster (9); Temperature sensor (8) is arranged on the heat source body or the low-temperature receiver body exit of heat exchanger, its output is connected with the input of adjuster, convert detected heat source body or low-temperature receiver body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster (9) returns adjustable valve (4) with low-temperature receiver body or heat source body and is connected, and adjusts the aperture that low-temperature receiver body or heat source body return adjustable valve (4) according to the heat source body that receives or low-temperature receiver body outlet temperature signal.
10. the control method of heat exchanger heat transfer amount according to claim 8 is characterized in that fresh low-temperature receiver body or heat source body inlet flow rate regulation device (7) comprise temperature sensor (10) and adjuster (11); Temperature sensor (10) is arranged on the heat source body or the low-temperature receiver body exit of heat exchanger, its output is connected with the input of adjuster, convert detected heat source body or low-temperature receiver body outlet temperature to the signal of telecommunication and send adjuster to, the output of adjuster (11) is connected with fresh low-temperature receiver body or heat source body inlet flow rate control valve (5), adjusts the aperture of fresh low-temperature receiver body or heat source body inlet flow rate control valve (5) according to the heat source body that receives or low-temperature receiver body outlet temperature signal.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953637A (en) * | 2016-04-13 | 2016-09-21 | 舒方硕 | Heat exchanger for full heat exchange of fluid, and control method for heat exchanger |
| CN106196799A (en) * | 2016-08-25 | 2016-12-07 | 浙江夏王纸业有限公司 | One utilizes public water delivery low-temperature receiver amount to replace production body paper thermal device |
| CN107741172A (en) * | 2017-11-10 | 2018-02-27 | 清华大学 | Compressed air cold energy reclamation device and its application method |
| CN108534590A (en) * | 2018-04-23 | 2018-09-14 | 法雷奥汽车空调湖北有限公司动力总成热系统分公司 | A kind of heat-exchange device of controllable flow rate |
| CN111457781A (en) * | 2020-04-14 | 2020-07-28 | 武汉腾云数冷科技有限公司 | Parallel loop water mixing heat exchange PID control system and control method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968331A (en) * | 2010-10-19 | 2011-02-09 | 天津渤海化工有限责任公司天津碱厂 | Method for controlling heat exchange temperature |
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2007
- 2007-10-09 CN CNB2007100501861A patent/CN100570267C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105953637A (en) * | 2016-04-13 | 2016-09-21 | 舒方硕 | Heat exchanger for full heat exchange of fluid, and control method for heat exchanger |
| CN106196799A (en) * | 2016-08-25 | 2016-12-07 | 浙江夏王纸业有限公司 | One utilizes public water delivery low-temperature receiver amount to replace production body paper thermal device |
| CN107741172A (en) * | 2017-11-10 | 2018-02-27 | 清华大学 | Compressed air cold energy reclamation device and its application method |
| CN108534590A (en) * | 2018-04-23 | 2018-09-14 | 法雷奥汽车空调湖北有限公司动力总成热系统分公司 | A kind of heat-exchange device of controllable flow rate |
| CN111457781A (en) * | 2020-04-14 | 2020-07-28 | 武汉腾云数冷科技有限公司 | Parallel loop water mixing heat exchange PID control system and control method thereof |
| CN111457781B (en) * | 2020-04-14 | 2021-11-09 | 武汉腾云数冷科技有限公司 | Parallel loop water mixing heat exchange PID control system and control method thereof |
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| CN100570267C (en) | 2009-12-16 |
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