Measuring unit and method for measuring heat exchange efficiency of various falling film heads
By designing a measuring unit for the film-reducing head, using hot water and cold water of various temperatures to measure the evaporation amount of the film-reducing evaporator, the problem of inaccurate heat exchange efficiency measurement in the prior art is solved, and accurate heat exchange is achieved Efficiency calculation and cost reduction ensure the accuracy and safety of experimental results.
Patent Information
- Application Number
- CN202411445810.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-01-03
AI Technical Summary
The existing method of measuring heat exchange efficiency of the lowering film head cannot be accurately measured, resulting in large differences between theoretical calculations and actual conditions, increasing equipment costs, and the single temperature of the existing heat source and cold source cannot meet the measurement needs, which affects the accuracy of the test results.
A measuring unit is designed, including a falling film evaporation module and a cold source heat source module. Through the cold source heat source module, it generates hot water and cold water of various temperatures, combined with heat heating coils, cold heating coils, compressors and expansion valves. Heat exchange is achieved, the evaporation amount of the falling film evaporator is measured every hour, and the heat exchange coefficient is calculated to determine the heat exchange efficiency.
Accurate measurement of heat exchange coefficients is achieved, equipment costs are reduced, energy waste is reduced, experimental results are referenced, and safety hazards of high temperature and high pressure are eliminated.
Smart Images
Figure CN119246610A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of cylinder longitudinal seam assembly fixtures, and in particular relates to a measuring unit and method for measuring the heat exchange efficiency of various falling film heads. Background Art
[0002] Film evaporation is to add the feed liquid from the upper tube box of the falling film evaporator heating chamber, and evenly distribute it to each heat exchange tube through the liquid distribution and film forming device (the film forming device is our falling film head). Under the action of gravity, vacuum induction and airflow, it flows from top to bottom in a uniform film. During the flow process, it is heated and vaporized by the shell side heating medium, and the generated steam and liquid phase enter the separation chamber of the evaporator together. After the vapor and liquid are fully separated, the steam enters the condenser for condensation, and the liquid phase is discharged from the separation chamber. There is a direct connection between the heat transfer efficiency of the falling film evaporator and the falling film head. The heat transfer coefficients of the falling film heads we use now are calculated based on theory. There is a large deviation between the calculation and the actual situation. Sometimes, in order to achieve the process goals, we can only enlarge the margin, resulting in a large increase in production costs. If we can accurately measure the heat transfer coefficient, we can calculate the heat exchange area that just meets the needs, which can greatly reduce our equipment costs. Therefore, we need a method to measure the heat transfer efficiency of the falling film head. The falling film evaporator is available, but there is currently no unit system specifically used to measure the heat transfer efficiency of the falling film head. To make the falling film evaporator run, it is nothing more than providing a heat source and a cold source. However, the heat source used in the current production process is a steam generator, and the temperature of this source is 120 degrees, which is fixed. The cold water is generated by a cooling tower, and the temperature of the source is 25°C, which is also fixed. The temperature of the heat source and cold source generated is single, which cannot meet the measurement needs and cannot verify the accuracy of the test results. Summary of the invention
[0003] (1) Technical problem to be solved: In view of the current need for a method capable of measuring the heat exchange efficiency of a falling film head, the present invention provides a measuring unit and method for measuring the heat exchange efficiency of various falling film heads to solve the technical problem raised in the background technology.
[0004] (2) The technical solution adopted by the present invention is as follows: A measuring unit for measuring the heat exchange efficiency of various falling film heads, comprising a falling film evaporation module and a cold source heat source module, the cold source heat source module comprising a cold medium container and a hot medium container, the cold medium container and the hot medium container are both connected to a medium replenishing pipeline, a cold source delivery outlet and a cold source reflux inlet are arranged on the cold medium container, the cold source delivery outlet is connected to a cold source delivery device, a heat source delivery outlet and a heat source reflux inlet are arranged on the hot medium container, the heat source delivery outlet is connected to the heat source delivery device, a hot heating coil is arranged inside the hot medium container, a cold heating coil is arranged inside the cold medium container, the inlet end of the hot heating coil is sequentially connected to the outlet end of the compressor and the cold heating coil, the outlet end of the hot heating coil is sequentially connected to an auxiliary cooler, an expansion valve and a cold heating coil The inlet end of the tube, an auxiliary heater and a heat source temperature measuring device are arranged on the hot medium container, a cold source temperature measuring device is arranged on the cold medium container, the falling film evaporation module includes a falling film evaporator and a condenser, the falling film evaporator is provided with a heat source inlet and a heat source outlet, the heat source conveying device is connected to the heat source inlet, the heat source outlet is connected to the heat source reflux inlet, the condenser is provided with a cold source inlet and a cold source outlet, the cold source conveying device is connected to the cold source inlet, the cold source outlet is connected to the cold source reflux inlet, the falling film evaporator is provided with a feed port, a feed port and a steam outlet, the condenser is provided with a steam inlet and a condensate outlet, the steam outlet is connected to the steam inlet, the condensate outlet is connected to the condensate tank, and the condensate tank is arranged on the weighing device.
[0005] A further technical solution is that the falling film evaporator comprises, from top to bottom, an upper tube box, a heating chamber, a separation chamber and a liquid collecting chamber, the falling film head is located at the upper part of the heating chamber, the feed port is arranged on the top of the upper tube box, the discharge port is arranged on the liquid collecting chamber, the liquid collecting chamber is connected in sequence to the liquid supply pump and the raw material tank through a liquid supply pipeline, the liquid collecting chamber is connected in sequence to the circulation pump and the feed port through a circulation pipeline, and the upper part of the liquid collecting chamber is connected to the vacuum pump through a vacuum pipeline.
[0006] A measurement method comprises measuring the heat exchange efficiency of different falling film heads by using the measuring unit for measuring the heat exchange efficiency of various falling film heads. During the measurement, hot water at a set temperature and cold water at a set temperature are generated by a cold source heat source module. The hot water at the set temperature and the cold water at the set temperature include multiple types, and the hot water and the cold water are used as the heat source and the cold source of the falling film evaporation module respectively. Meanwhile, the amount of the cold source heat source generated by the heat source heat source generating module is greater than the amount of the cold source heat source required by the falling film evaporation module. When sufficient energy is introduced into the falling film evaporation module, the evaporation amount of the falling film evaporator per hour is measured, including the evaporation amount of the falling film evaporator without a falling film head, with a falling film head, and with different falling film heads. In each case, the measurement is performed respectively with multiple types of hot water at the set temperature and cold water at the set temperature. Then, the heat exchange coefficient of the falling film evaporator per hour is calculated according to the formula ,Q refers to the evaporation heat, which is converted according to the evaporation amount. S is the heat exchange area, which is fixed. T refers to the temperature difference, which is also fixed. That is, after measuring the evaporation amount, the heat transfer efficiency of the falling film head can be calculated to compare the heat exchange effects of various falling film heads.
[0007] (3) Due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. A measuring unit is provided, which includes a falling film evaporation module and a cold source heat source module. The cold source heat source module can provide heat sources and cold sources of various temperatures for the falling film evaporation module. A measuring method is provided, which uses the measuring unit to measure the evaporation amount of the falling film evaporator per hour, including the evaporation amount of the falling film evaporator without a falling film head, with a falling film head, and with different falling film heads, and in each case, hot water at a plurality of set temperatures and cold water at a set temperature are used respectively. Then, the heat transfer coefficient of the falling film evaporator per hour is calculated according to the formula After measuring the evaporation amount, the heat transfer coefficient of the falling film head can be calculated. By actual measurement, a relatively accurate heat transfer coefficient can be obtained, and the heat exchange area that just meets the demand can be calculated. This can greatly reduce the equipment cost and make up for the problem that the heat transfer coefficient calculated by the prior art based on theory has a large deviation from the actual calculation. In order to achieve the process goal, the margin can only be enlarged, resulting in a large increase in production costs.
[0008] 2. Through the hot heating coil, cold heating coil, compressor and expansion valve and the intermediate medium (refrigerant), heat is exchanged between the cold medium container and the hot medium container to achieve the heat exchange between the cold source and the heat source, thereby achieving the purpose of energy saving, reducing energy waste and saving production costs. 3. By setting up auxiliary heaters and auxiliary coolers, I can generate the heat source temperature and cold source temperature I want, just like the actual working conditions. The experimental results obtained are only for reference. Moreover, the heat source and cold source temperatures can be accurately controlled under the auxiliary heaters and auxiliary coolers and the corresponding control points, eliminating the safety hazards of high temperature and high pressure in the overall operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of the connection relationship of the components of the cold source and heat source module of the present invention; Figure 2 It is a schematic diagram of the connection relationship of the components of the measuring machine set of the present invention; Figure 3 It is the operating principle diagram of the measuring unit of the present invention; Figure 4 Schematic diagram of the connection relationship of the components of the falling film evaporation module of the present invention. Figure 5It is a schematic diagram of the structures of various falling film heads described in the present invention.
[0010] 1. Cold medium container; 2. Hot medium container; 3. Medium replenishment pipeline; 4. Cold source delivery outlet; 5. Cold source reflux inlet; 6. Cold source delivery device; 7. Heat source delivery outlet; 8. Heat source reflux inlet; 9. Heat source delivery device; 10. Hot heating coil; 11. Cold heating coil; 12. Compressor; 13. Auxiliary cooler; 14. Expansion valve; 15. Auxiliary heater; 16 Heat source temperature measuring device; 17. Cold source temperature measuring device; 18. Falling film evaporator; 19. Condenser; 20. Heat source inlet; 21. Heat source outlet; 22. Cold source inlet; 23. Cold source outlet; 24. Feed inlet; 25. Discharge outlet; 26. Steam outlet; 27. Steam inlet; 28. Condensate outlet; 29. Condensate tank; 30. Upper pipe box; 31. Heating chamber; 32. Separation chamber; 33. Liquid collecting chamber; 34. Vacuum pump; 35 Circulation pump. DETAILED DESCRIPTION
[0011] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0012] like Figure 1-Figure 4A measuring unit for measuring the heat exchange efficiency of various falling film heads, including a falling film evaporation module, including a cold source heat source module, the cold source heat source module including a cold medium container 1 and a hot medium container 2, the cold medium container 1 and the hot medium container 2 are both connected to a medium replenishing pipeline 3, a cold source delivery outlet 4 and a cold source reflux inlet 5 are arranged on the cold medium container 1, the cold source delivery outlet 4 is connected to a cold source delivery device 6, a heat source delivery outlet 7 and a heat source reflux inlet 8 are arranged on the hot medium container 2, the heat source delivery outlet 7 is connected to a heat source delivery device 9, a hot heating coil 10 is arranged inside the hot medium container 2, a cold heating coil 11 is arranged inside the cold medium container 1, the inlet end of the hot heating coil 10 is connected to a compressor 12 and the outlet end of the cold heating coil 11 in sequence, the outlet end of the hot heating coil 10 is connected to an auxiliary cooler 13, an expansion valve 14 and the inlet end of the cold heating coil 11 in sequence, the hot medium An auxiliary heater 15 and a heat source temperature measuring device 16 are arranged on the container 2, a cold source temperature measuring device 17 is arranged on the cold medium container 1, the falling film evaporation module includes a falling film evaporator 18 and a condenser 19, the falling film evaporator 18 is provided with a heat source inlet 20 and a heat source outlet 21, the heat source conveying device 9 is connected to the heat source inlet 20, the heat source outlet 21 is connected to the heat source reflux inlet 8, the condenser 19 is provided with a cold source inlet 22 and a cold source outlet 23, the cold source conveying device 6 is connected to the cold source inlet 22, the cold source outlet 23 is connected to the cold source reflux inlet 5, the falling film evaporator 18 is provided with a feed inlet 24, a discharge port 25 and a steam outlet 26, the condenser 19 is provided with a steam inlet 27 and a condensate outlet 28, the steam outlet 26 is connected to the steam inlet 27, the condensate outlet 28 is connected to the condensate tank 29, and the condensate tank is arranged on the weighing device. The heat source conveying device 9 and the cold source conveying device 6 are both pumps, the auxiliary heater 15 is an electric heater, and the heat source temperature measuring device 16 and the cold source temperature measuring device 17 are both thermometers.
[0013] The falling film evaporator 18 comprises, from top to bottom, an upper tube box 30, a heating chamber 31, a separation chamber 32 and a liquid collecting chamber 33. The falling film head is located at the upper part of the heating chamber 31. The feed port 24 is arranged on the top of the upper tube box 30. The discharge port 25 is arranged on the liquid collecting chamber 33. The liquid collecting chamber 33 is connected to the liquid supply pump and the raw material tank in sequence through a liquid supply pipeline. The liquid collecting chamber 33 is connected to the circulation pump 35 and the feed port 24 in sequence through a circulation pipeline. The upper part of the liquid collecting chamber 33 is connected to the vacuum pump 34 through a vacuum extraction pipeline.
[0014] When in use, the water is heated to make hot water and cooled to make cold water by introducing an intermediate medium (refrigerant) to produce different heat sources and cold sources. The generated heat source is provided to the falling film evaporation equipment as a heat source, and the generated cold source is provided to the condenser 19. At the same time, the auxiliary heater 15 and the corresponding control points can generate any required heat source and cold source. The introduced intermediate medium is called refrigerant. The refrigerant is vaporized through the coil heat exchange in the cold medium container 1, and then heated and pressurized by the compressor 12 before entering the hot medium container 2. At the same time, there is an auxiliary electric heater in the hot medium container 2 to control the temperature of the hot water. An auxiliary cooler 13 is installed at the outlet of the hot medium coil to further control The temperature of the cold water in the cold medium container 1, the refrigerant after passing through the auxiliary cooler 13 becomes mist through the expansion valve 14 and then enters the coil of the cold medium container 1 to be gasified. The auxiliary cooler 13 is a heat dissipation fan, and the intermediate medium is in the form of a coil at the position of the auxiliary cooler 13. The refrigerant is circulated repeatedly in the cold medium container 1 and the hot medium container 2. The present invention realizes heat exchange between the cold source and the heat source by introducing an intermediate heat exchange transfer between the cold medium container 1 and the hot medium container 2, thereby achieving the purpose of energy saving, reducing energy waste, and saving production costs.
[0015] A measurement method comprises measuring the heat exchange efficiency of different falling film heads by using the measuring unit for measuring the heat exchange efficiency of various falling film heads. During the measurement, hot water at a set temperature and cold water at a set temperature are generated by a cold source heat source module. The hot water at the set temperature and the cold water at the set temperature include multiple types. The hot water and the cold water are used as the heat source and the cold source of the falling film evaporation module respectively. Meanwhile, the amount of the cold source heat source generated by the heat source heat source generating module is greater than the amount of the cold source heat source required by the falling film evaporation module. When sufficient energy is introduced into the falling film evaporation module, the evaporation amount of the falling film evaporator 18 per hour is measured, including the evaporation amount of the falling film evaporator 18 without a falling film head, with a falling film head, and with different falling film heads. In each case, the measurement is performed respectively with multiple types of hot water at the set temperature and cold water at the set temperature. Then, the heat exchange coefficient of the falling film evaporator 18 per hour is calculated according to the formula ,Q refers to the evaporation heat, which is converted according to the evaporation amount. S is the heat exchange area, which is fixed. T refers to the temperature difference, which is also fixed. That is, after measuring the evaporation amount, the heat transfer efficiency of the falling film head can be calculated to compare the heat transfer effects of various falling film heads. The evaporation amount can be obtained by weighing the weight of the condensed water through a weighing device (electronic scale). The weight of the condensed water is equal to the evaporation amount.
[0016] In this experiment, 6 types of falling film heads were selected, and the heat transfer coefficients of various falling film heads were inferred based on the configurations, such as Figure 5 shown.
[0017] According to the above experimental data, the heat transfer efficiency of the hemispherical head film distributor is the highest. At the same time, various forms of falling film heads can be designed to measure their heat transfer efficiency.
[0018] The above are only preferred embodiments of the present invention.
Claims
1. A measuring unit for measuring the heat exchange efficiency of various falling film heads, comprising a falling film evaporation module, characterized in that: The invention comprises a cold source heat source module, which comprises a cold medium container and a hot medium container. Both the cold medium container and the hot medium container are connected to a medium replenishing pipeline. A cold source delivery outlet and a cold source reflux inlet are arranged on the cold medium container. The cold source delivery outlet is connected to a cold source delivery device. A heat source delivery outlet and a heat source reflux inlet are arranged on the hot medium container. The heat source delivery outlet is connected to the heat source delivery device. A hot heating coil is arranged inside the hot medium container. A cold heating coil is arranged inside the cold medium container. The inlet end of the hot heating coil is connected to a compressor and an outlet end of the cold heating coil in sequence. The outlet end of the hot heating coil is connected to an auxiliary cooler, an expansion valve and an inlet end of the cold heating coil in sequence. An auxiliary heater and a heat source temperature measuring device are provided, a cold source temperature measuring device is provided on the cold medium container, the falling film evaporation module includes a falling film evaporator and a condenser, the falling film evaporator is provided with a heat source inlet and a heat source outlet, the heat source conveying device is connected to the heat source inlet, the heat source outlet is connected to the heat source reflux inlet, the condenser is provided with a cold source inlet and a cold source outlet, the cold source conveying device is connected to the cold source inlet, the cold source outlet is connected to the cold source reflux inlet, the falling film evaporator is provided with a feed inlet, a feed outlet and a steam outlet, the condenser is provided with a steam inlet and a condensate outlet, the steam outlet is connected to the steam inlet, the condensate outlet is connected to the condensate tank, and the condensate tank is provided on the weighing device.
2. A measuring unit for measuring the heat exchange efficiency of various falling film heads according to claim 1, characterized in that: The falling film evaporator comprises, from top to bottom, an upper tube box, a heating chamber, a separation chamber and a liquid collecting chamber, the falling film head is located at the upper part of the heating chamber, the feed port is arranged at the top of the upper tube box, the discharge port is arranged on the liquid collecting chamber, the liquid collecting chamber is connected to the liquid supply pump and the raw material tank in sequence through a liquid supply pipeline, the liquid collecting chamber is connected to the circulation pump and the feed port in sequence through a circulation pipeline, and the upper part of the liquid collecting chamber is connected to the vacuum pump through a vacuum extraction pipeline.
3. A measurement method, characterized in that: The method comprises measuring the heat exchange efficiency of different falling film heads by using the measuring unit for measuring the heat exchange efficiency of various falling film heads as described in claim 1. During the measurement, hot water at a set temperature and cold water at a set temperature are generated by a cold source heat source module. The hot water at the set temperature and the cold water at the set temperature include multiple types, and the hot water and the cold water are used as the heat source and the cold source of the falling film evaporation module respectively. At the same time, the amount of the cold source heat source generated by the heat source heat source generating module is greater than the amount of the cold source heat source required by the falling film evaporation module. When sufficient energy is introduced into the falling film evaporation module, the evaporation amount of the falling film evaporator per hour is measured, including the evaporation amount of the falling film evaporator without a falling film head, with a falling film head, and with different falling film heads. In each case, the measurement is performed separately with multiple types of hot water at the set temperature and cold water at the set temperature. Then, the heat exchange coefficient of the falling film evaporator per hour is calculated according to the formula ,Q refers to the evaporation heat, which is converted according to the evaporation amount. S is the heat exchange area, which is fixed. T refers to the temperature difference, which is also fixed. That is, after measuring the evaporation amount, the heat transfer efficiency of the falling film head can be calculated to compare the heat exchange effects of various falling film heads.