CN103616907B - Temperature adjusting device for heat exchange experiments - Google Patents
Temperature adjusting device for heat exchange experiments Download PDFInfo
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- CN103616907B CN103616907B CN201310704409.7A CN201310704409A CN103616907B CN 103616907 B CN103616907 B CN 103616907B CN 201310704409 A CN201310704409 A CN 201310704409A CN 103616907 B CN103616907 B CN 103616907B
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Abstract
The invention relates to a temperature adjusting device for heat exchange experiments. The temperature adjusting device comprises a tank body for containing cooling water, wherein the interior of the tank body is divided into a first tank body and a second tank body by a partition plate; a first heating device is mounted in the first tank body, a drain pipe is mounted at the bottom, a water return pipe and a water replenishing pipe are mounted at the top, and an additional drainage pipe and a fourth regulating valve are arranged on the water return pipe; a second heating device is mounted in the second tank body, an overflow pipe is mounted at the upper part of the side wall of the second tank body, a water supply pipeline is mounted at the lower part, and the drain pipe and the overflow pipe are connected with the drainage pipe. The temperature adjusting device provided by the invention is designed against the temperature control range of a cooling water tank, which is required for the experiments, fully utilizes the characteristic of rich industrial water sources in a power plant, and directly uses a method of injecting water at normal temperature to cool the circulating cooling water; compared with the traditional cooling water tank, a compressor is omitted, so that the space is saved. Furthermore, the opening degree of the fourth regulating valve can be reduced to control the flow rate of the cooling water after heat exchange, which is returned to the tank body through the water return pipe and has relatively high temperature.
Description
Technical field
The present invention relates to control field, particularly relate to a kind of local heat transfer register.
Background technology
Cooling water tank belongs to the conventional instrument and equipment of industrial circle and scientific research field, the occasion of accurate controlled cooling model procedure parameter is needed at some, cavity as laser instrument cools or in some scientific experiment, usually needs in cooling tube, pass into the specific chilled water of temperature range.
Conventional cooling water tank generally has two features: if a cooling water circulation utilizes, generally need to lower the temperature to chilled water, the method of cooling uses cooling device often, but, the general volume ratio of compressor is larger, use extra cooling device to make the water tank natively needing to take very large space heavier, be not suitable for very much using in the place of narrow space; If two need accurately to carry out temperature control, usual employing be closed loop control method in automatically controlling, this needs the complexity increasing circuit design and control operation on the one hand, on the other hand due to environmental change, needs the various setup parameters adjusted in real time to ensure the accuracy of temperature control.
Figure 1 shows that cooling water tank of the prior art, this cooling water tank uses fan blower and air pump to coordinate and cools chilled water, this cooling water tank needs extra air-blast device and air extractor, increases the volume of cooling water tank, does not possess the function of accurate controlled cooling model coolant-temperature gage simultaneously.
At present, in the research heat transfer characteristic of boiler tail flue gas and the experiment of corrosive property, in order to study the impact of heat interchanger wall temperature heat exchanger heat exchange property, need to control heat interchanger wall temperature by the temperature of accurate controlled cooling model water.In this experiment, because boiler tail flue gas complicated component, temperature are high, simulated experiment platform difficulty is built in laboratory, so experiment mainly completes in the actual motion environment of power plant, experiment condition is subject to a lot of restriction.Generally closely, operating space is narrow and small for the layout of such as power plant, and the conventional cooling water tank with compressor is not suitable for this workplace; Power plant's experiment condition is simple and crude on the other hand, and environment is noisy, and experimenter wishes to use simple control method as far as possible to complete experiment.
Summary of the invention
The object of this invention is to provide a kind of local heat transfer register, for the particular surroundings of power plant, be applicable to use in power plant's cooling.
The technical scheme that the present invention takes is:
A kind of local heat transfer register, comprise the casing containing chilled water, be provided with dividing plate in casing and casing be separated into the first casing and the second casing, in first casing, first heater is installed, bottom is provided with leak-off pipe, top is provided with return pipe and filling pipe, return pipe is provided with additional drainage pipe and the 4th variable valve, in second casing, secondary heating mechanism is installed, the top of the second wall box is provided with run-down pipe, bottom is provided with water supply line, and leak-off pipe is all connected with drainpipe with run-down pipe.
The volume of the first described casing is greater than the volume of described second casing, and particularly, the volume of the first casing is the twice of the volume of described second casing.The power of described first heater is greater than the power of described secondary heating mechanism, and particularly, the power of described first heater is 4KW, and the power of described secondary heating mechanism is 1KW.
Described first casing communicates above dividing plate with the second casing, and described run-down pipe is positioned at the sidewall top position of the second casing and it is highly lower than the height of described dividing plate, thus the water uniaxially in the first casing is flowed in the second casing.
Described dividing plate is provided with the temperature sensor of water temperature in survey second water tank, described water supply line inside is provided with the temperature sensor surveying water supply water temperature.
Described water supply line is provided with the first variable valve and water pump, described filling pipe is provided with the second variable valve, described leak-off pipe is provided with the 3rd variable valve.Each temperature sensor and heating arrangement are connected with controller, are controlled by the controller.The first temperature controller that controller comprises power supply, is connected with the first temperature sensor, the second temperature controller be connected with the second temperature sensor, first temperature controller is by the first Control first heater, and the second temperature controller is by the second Control secondary heating mechanism.Water supply line is outwards supplied water by water pump.
The invention solves when water tank is applied in summer high temperature environment (as environment temperature reaches more than 35 DEG C, now as the water temperature of power plant's normal temperature process water of make-up water generally at nearly 30 DEG C), the temperature of chilled water is wanted to control below 35 DEG C, what need the aperture of the second variable valve to open is very large, to increase the increment of normal-temperature water, and simultaneously, need because power plant arranges, drainpipe is often very long, resistance is very large, water tank spilling water may be caused not in time because of draining, make the problem that water tank cannot normally work.Return pipe adds the 4th variable valve, and additional drainage pipe drawn by pipeline before the 4th variable valve, when needing the temperature of chilled water to control at lower temperature, the aperture can turning the 4th variable valve down is to control the flow being returned chilled water after the higher heat exchange of the temperature of casing by return pipe.
The beneficial effect compared with prior art had:
1) in the power plant's local heat transfer that the present invention relates to, the temperature range of required chilled water is 35 DEG C-80 DEG C, for this temperature control scope, the present invention takes full advantage of the feature of power plant's industry abundant water, the direct method injecting normal-temperature water that uses cools recirculated cooling water, compare traditional cooling water tank and decrease compressor, save space, be suitable for carrying out field experiment use in power plant.
2) waterbox design is two body structures by the present invention, adopt the design of two-stage temperature control, use high power heater coarse adjustment temperature in large casing, low-power heating device is used to finely tune temperature in small box, ensure that temperature control efficiency and temperature-controlled precision simultaneously, namely control method without the need to complexity can realize accurate temperature controlling, and error reaches within 1 DEG C.
Accompanying drawing explanation
Fig. 1 is existing cooling water tank schematic diagram;
Fig. 2 is the schematic diagram of two-stage cooling water tank in the embodiment of the present invention;
Fig. 3 is the schematic diagram of embodiment of the present invention middle controller;
1. casing, 2. controller, 3. dividing plate, 41. water supply lines, 42. return pipes, 43. filling pipes, 44. drainpipes, 45. additional drainage pipes, 441. leak-off pipes, 442. run-down pipes, 51. first heaters, 52. secondary heating mechanisms, 61. first variable valve, 62. second variable valve, 63. the 3rd variable valve, 64. the 4th variable valve, 71. first temperature sensors, 72. second temperature sensors, 8. water pump, 11. first casings, 12. second casings, 21. power supplys, 221. first temperature controllers, 222. second temperature controllers, 231. first relays, 232. second relays.
Embodiment
Further illustrate below in conjunction with embodiment.
Embodiment 1
As shown in Figure 2, a kind of local heat transfer register, comprise the casing 1 containing chilled water, be provided with dividing plate 3 in casing 1 and casing be separated into the first casing 11 and the second casing 12, and the first casing 11 and the second casing 22 communicate above dividing plate 3, in first casing 11, first heater 51 is installed, bottom is provided with leak-off pipe 441, top is provided with return pipe 42 and filling pipe 43, return pipe 42 is provided with additional drainage pipe 45 and the 4th variable valve 64, in second casing 12, secondary heating mechanism 52 is installed, the top of the second casing 12 sidewall is provided with run-down pipe 442, bottom has been installed on water supply line 41, leak-off pipe 441 is all connected with drainpipe 44 with run-down pipe 442.
The volume of the first casing 11 is greater than the volume of described second casing 12, and particularly, the volume of the first casing 11 is twices of the volume of described second casing 12.The power of first heater is greater than the power of described secondary heating mechanism, and particularly, the power of described first heater is 4KW, and the power of described secondary heating mechanism is 1KW.
Leak-off pipe 441 is positioned at the sidewall top position of described second casing and it is highly lower than the height of described dividing plate 3, thus the water uniaxially in the first casing is flowed in the second casing.。
Water supply line 41 is positioned at the position close to bottom below described second wall box, is externally supplied water by water pump 8.
Dividing plate 3 is provided with the first temperature sensor 71 near the top of the first casing side, and for measuring the water temperature in the first casing 11, described water supply line 41 inside is provided with the second temperature sensor 72.Water supply line 41 is provided with the first variable valve 61 and water pump 8, described filling pipe 43 is provided with the second variable valve 62, described leak-off pipe 441 is provided with the 3rd variable valve 63.Each temperature sensor and heating arrangement are connected with controller 2, are controlled by the controller.
The first temperature controller 221 that the controller that the two-stage cooling water tank that the present embodiment provides uses comprises power supply 21, is connected with described first temperature sensor 71, the second temperature controller 222 be connected with described second temperature sensor 72, described first temperature controller 221 controls the work of described first heater 51 by the first relay 231, described second temperature controller controls described secondary heating mechanism 52 by the second relay 232 and works.
In the present embodiment, cooling water tank is used for boiler exhaust gas local heat transfer, provides the chilled water of 55 DEG C to heat exchanger tube.Heat exchanger tube is arranged in the flue after boiler air preheater, this section of flue gas in flue temperature is between 110-140 DEG C, by measuring the parameters such as such as inflow temperature, leaving water temperature, cooling water flow, observation heat exchanger tube temperature, seek the impact of the pipe surface temperature exchange heat pipe heat exchange property of the heat exchanger tube being arranged in boiler exhaust gas.
The course of work of water tank is as follows:
Heating period, close the 3rd variable valve 63, first variable valve 61 and water pump 8, in water tank, fill water by moisturizing pipeline, the control temperature of the first temperature controller 221 and the second temperature controller is set as 52 DEG C, heat the chilled water to 52 DEG C in the first casing 11 and the second casing 12.
Working stage, is set as 53 DEG C by the control temperature of the first temperature controller 221, and the control temperature of the second temperature controller 222 is set as 55 DEG C, opens the first variable valve 61 and water pump 8.By regulating the flow of inlet water of the aperture controlled cooling model water of the first variable valve 61, the heat transfer characteristic of tube wall under various heat exchange amount can be observed.By the flow of the design temperature and filling pipe 43 that change the first temperature controller 221, second temperature controller 222, the water temperature that can control constant temperature water tank works between 40-80 DEG C.
Ending phase, first closes the second variable valve 62, opens the water in emptying first casing 11 of the 3rd variable valve 63, and after the water in the second casing 12 is drained by water pump 8, switch off the pump 8 and first variable valve 61.
When needing to control at lower temperature by the temperature of chilled water, during as 35 DEG C, the aperture can turning the 4th variable valve 64 down is to control the flow being returned chilled water after the higher heat exchange of the temperature of casing by return pipe 42.
By increasing the 4th variable valve 64 and additional drainage pipe 45, the cooling water tank described in the present embodiment can provide the chilled water of 30 DEG C-90 DEG C in summer high temperature environment.Because the temperature of boiler exhaust gas acid dew point is generally more than 70 DEG C, the temperature of water dew point is generally between 30-40 DEG C, therefore, the temperature range of the chilled water that this water tank provides makes those skilled in the art heat exchanging tube wall temperature to control, the heat transfer characteristic of heat exchanger tube when observation heat exchanger tube wall temperature is near these two dewpoint temperatures.
Claims (5)
1. a local heat transfer register, comprise the casing and controller of containing chilled water, it is characterized in that, be provided with dividing plate in casing and casing be separated into the first casing and the second casing, in first casing, first heater is installed, bottom is provided with leak-off pipe, top is provided with return pipe and filling pipe, return pipe is provided with additional drainage pipe and the 4th variable valve, in second casing, secondary heating mechanism is installed, the top of the second wall box is provided with run-down pipe, and bottom is provided with water supply line, and leak-off pipe is all connected with drainpipe with run-down pipe.
2. a kind of local heat transfer register according to claim 1, it is characterized in that, described dividing plate is provided with the first temperature sensor of water temperature in survey first casing, described water supply line inside is provided with the second temperature sensor surveying water supply water temperature, described water supply line is provided with the first variable valve and water pump, described filling pipe is provided with the second variable valve, described leak-off pipe is provided with the 3rd variable valve, each temperature sensor and heating arrangement are connected with controller.
3. a kind of local heat transfer register according to claim 2, it is characterized in that, described controller comprises power supply, the first temperature controller be connected with the first temperature sensor, the second temperature controller of being connected with the second temperature sensor, first temperature controller is by the first Control first heater, and the second temperature controller is by the second Control secondary heating mechanism.
4. a kind of local heat transfer register according to claim 1, is characterized in that, the volume of the first described casing is greater than the volume of described second casing.
5. a kind of local heat transfer register according to claim 1, is characterized in that, the power of described first heater is greater than the power of described secondary heating mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310704409.7A CN103616907B (en) | 2013-12-19 | 2013-12-19 | Temperature adjusting device for heat exchange experiments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310704409.7A CN103616907B (en) | 2013-12-19 | 2013-12-19 | Temperature adjusting device for heat exchange experiments |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103616907A CN103616907A (en) | 2014-03-05 |
| CN103616907B true CN103616907B (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310704409.7A Expired - Fee Related CN103616907B (en) | 2013-12-19 | 2013-12-19 | Temperature adjusting device for heat exchange experiments |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105373160A (en) * | 2015-11-13 | 2016-03-02 | 通用国际企业有限公司 | Liquid heating system and method thereof |
| CN112144069A (en) * | 2020-09-25 | 2020-12-29 | 阳光电源股份有限公司 | Spray coating device and temperature adjusting method for spray coating device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2173967Y (en) * | 1993-11-30 | 1994-08-10 | 曹振寿 | Circulating water temp. controller |
| US20030091091A1 (en) * | 2001-11-15 | 2003-05-15 | Patterson Wade C. | System and method for controlling temperature of a liquid residing within a tank |
| CN101275872A (en) * | 2008-04-24 | 2008-10-01 | 庄瑞国 | Automatic constant temperature fluid bath |
| CN203338170U (en) * | 2013-07-02 | 2013-12-11 | 福建兴宇树脂有限公司 | Automatic thermostat |
| CN203606713U (en) * | 2013-12-19 | 2014-05-21 | 山东大学 | Temperature adjustment apparatus used for heat transfer experiment |
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Granted publication date: 20150617 Termination date: 20171219 |