CN211012561U - Air side gas and water mixed micro-atomization enhanced heat exchange system for air cooler - Google Patents

Abstract

An air side gas and water mixed micro-atomization enhanced heat exchange system for an air cooler comprises a water path assembly (1), a gas path assembly (2) and a monitoring control system (3); the monitoring control system (3) comprises an ambient temperature sensor (32), a humidity sensor (31), a wind speed sensor (33), a wind direction sensor (34), a fin temperature sensor (35), a hard disk for storing control data, and a CPU for processing data transmitted by each sensor and sending control signals. The gas-liquid two-phase jet flow is adopted as a technical means, and the atomization performance is effectively improved on the premise of low energy consumption. Therefore, the method has the advantages of low energy consumption, low cost, high efficiency and the like.

Description

Air side gas and water mixed micro-atomization enhanced heat exchange system for air cooler

Technical Field

The utility model relates to a gas, the double-phase atomizing of liquid and heat transfer technical field, a air side gas for air cooler, water mix fine atomization reinforcing heat transfer system specifically says so.

Background

The circulating cooling system is widely applied to the industries of metallurgy, petrifaction, electric power, chemical industry and the like. With the emphasis on water resources and the enhancement of environmental awareness, air has gradually replaced water as a cooling medium. The air cooler is the core equipment of the circulating cooling system, and is equipment which uses ambient air as a cooling medium and sweeps across the outside of the fin tube to cool or condense high-temperature process fluid in the tube, and is called an air cooler for short. Since the air cooler uses air as a cooling medium, seasonal changes in air temperature affect the cooling performance of the air cooler. In recent years, the problem of high temperature in summer is becoming more serious. High temperature heat not only affects human health, but also seriously affects the normal operation of air cooling equipment, even affects the whole process system, leads to increase of operation energy consumption, reduction of product quality and even brings serious potential safety hazard.

In response to such problems, the related art has conducted research and analysis in various technical levels. The invention discloses a peak cooling device of an air cooling condenser, which comprises a fan, a surface type radiator, a cooling water pipeline, a nozzle and the like. The method mainly adopts a mode of increasing water cooling, and auxiliary cooling of steam is carried out in a high-temperature period in summer. The scheme mainly comprises the steps of adding heat exchange equipment, having higher investment cost and greatly changing the original equipment.

For solving the heat transfer effect in summer in the short time, consider more that the system that adopts supplementary nature satisfies the requirement, as the utility model discloses a "power station direct air cooling system X shape atomizing humidification heat sink" of grant notice No. CN201652683U utility model discloses a this technical scheme is designed to power station air cooling system, mainly by dividing water tank, water supply branch pipe, the nozzle, metal collapsible tube etc. constitutes, top in A shape steelframe to the mode of whereabouts is from top to bottom sprayed water, in order to increase air humidity, reduce ambient temperature. The arrangement mode is to increase the residence time of liquid drops in the air by a height drop without considering the size of the liquid drops and the atomization coverage area, and the atomized liquid drops are easy to be evaporated in the air but directly fall to the ground.

The utility model discloses an "air cooling condenser high pressure sprays cooling system" that utility model patent of grant publication No. CN205332832U, this technical scheme mainly comprises high pressure water pump, high-pressure line and high pressure nozzle. Water is sprayed to the surfaces of the fins to directly cool the fins, so that the heat exchange performance of the fins is improved. The disadvantages of this solution are: 1. the particle size of the liquid drops is reduced in a high-pressure mode, the pressure-resistant grade of the whole system needs to be set to be more than 10MPa, and the energy consumption and the cost are correspondingly increased. 2. The fog drops directly sprayed to the fins can be condensed and combined with dregs in the air, and dirt which is difficult to remove can be formed on the surfaces of the fins for a long time, so that the fins are polluted, and the heat exchange performance of the fins is reduced.

The utility model discloses a "air cooling condenser spray humidification cooling system who combines the guide plate" that utility model patent of grant publication No. CN208487710U, this technical scheme is to power station air cooling system design, comprises water tank, multistage centrifugal pump, governing valve, guide plate etc.. The air at the outlet of the fan is guided by the guide plate, and water is sprayed to the upper part of the guide plate to increase the air humidity and reduce the temperature. The defects are basically consistent with the X-shaped atomization humidification cooling device.

Therefore, the prior art can not automatically adjust the water spraying amount according to the environmental condition and the equipment condition, so the cooling intensity required by the actual power of the equipment can not be automatically adjusted; the actual environment condition cannot be judged, and the spray amount of the water mist cannot be adjusted according to the temperature and the humidity; in addition, the air cooler is often arranged at a high place, and once the air cooler meets the weather of changeable wind direction or wind speed, atomized water is sprayed along with wind, water resources are consumed, and the expected cooling effect cannot be achieved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reinforcing heat transfer system based on gas, the fine atomizing technique of liquid mixture for all kinds of large-scale air cooler, fundamentally solves above-mentioned problem. It can improve air cooler air side condition in the high temperature period in summer, makes its heat transfer ability promote, ensures its safe operation to satisfy cooling system technological requirement. The gas-liquid two-phase jet flow is adopted as a technical means, and the atomization performance is effectively improved on the premise of low energy consumption. Therefore, the method has the advantages of low energy consumption, low cost, high efficiency and the like.

In order to achieve the above purpose, the utility model provides a following technical scheme: the air side gas and water mixed micro-atomization enhanced heat exchange system for the air cooler comprises a water path component (1), a gas path component (2) and a monitoring control system (3);

the waterway assembly (1) comprises a water supply assembly (10) and a secondary filter (11) which are arranged at the front end of the water pump (14), a first waterway electric valve (12) and an exhaust valve (17) which are arranged at the rear end of the water pump (14), and a plurality of second waterway electric valves (18) which are arranged at the tail ends of pipelines of the waterway assembly (1); the water supply assembly (10) comprises a water tank (104) with a liquid level meter (105), a primary safety valve (101), a first electric valve (103) and a primary filter (102) which are arranged at the front end of the water tank (104), and a secondary safety valve (107) and a second electric valve (106) which are arranged at the rear end of the water tank (104);

gas circuit subassembly (2) include air compressor (24), set up flow control motorised valve (23) and a plurality of settings at terminal gas circuit control valve (22) of gas circuit subassembly (2) pipeline on air compressor (24) output pipeline, and its technical essential is:

the monitoring control system (3) comprises an ambient temperature sensor (32), a humidity sensor (31), a wind speed sensor (33), a wind direction sensor (34), a fin temperature sensor (35), a hard disk for storing control data, and a CPU for processing data transmitted by each sensor and sending control signals.

The utility model also provides a control method of above-mentioned system, its technical essential is, including following step:

step 1, simulating the working environment of a cooling fin in a laboratory environment;

step 2, respectively measuring a standard curve of humidity/wind speed and a simulation curve of humidity/wind speed;

step 3, extracting parameter values with similarity of more than 90% to the standard curve from the simulation curve, and using the parameter values as a data set;

and 4, storing the data set in the step 3 in a hard disk of the monitoring control system (3) as a database, and comparing the environmental parameters with the parameter values in the database in real time to control the electric valve of the water path component (1) or the air path component (2).

The utility model has the advantages that:

on the whole technical scheme, the utility model discloses but each environmental parameter of real-time supervision influence cooling strength to make optimal feedback control, reach the best cooling effect with minimum energy consumption.

Specifically, the method comprises the following steps: the sensors comprise a temperature sensor, a humidity sensor, a wind speed sensor and a wind direction sensor which are used for monitoring the environment.

The temperature and humidity sensor can comprehensively judge the heat conduction (emission) speed in the current environment, for example, in an environment of 5-10 ℃, the higher the humidity is, the better the heat conduction effect is. At this time, the water mist ejection amount can be appropriately reduced.

Wind speed, wind direction sensor can synthesize and judge environment wind to water smoke, then are used for judging the influence of environment wind to water smoke injection position and spray regime to the air cooling equipment of the vertical setting of cooling shaft is for example, and its fan radiating fin sets up side by side usually, and the water smoke placement that lies in outermost side nozzle this moment can't all spray to the fin under the influence of environment wind on, leads to this part cooling water to be wasted. Through the comprehensive judgment of the sensors, the corresponding electromagnetic valve can be automatically controlled at the moment to close the nozzle, so that the endless consumption of water resources is avoided.

In addition, the sensor also comprises a gas circuit pressure sensor and a water circuit pressure sensor which monitor the pressure of the pipeline in real time; a temperature sensor for monitoring the cooled fin. The pressure sensor in the pipeline feeds back the pressure in the pipeline in real time and is used for adjusting the gas-water ratio at the nozzle in real time, so that the optimal cooling effect is achieved with the lowest consumption. And the temperature sensor on the fin can monitor the cooling effect in real time and judge whether the water mist cooling system needs to be started.

To sum up, the utility model discloses a control system can combine the feedback signal of above-mentioned sensor, relies on big data automatic judgement environmental condition, pipeline condition, and then subassemblies such as automatic control water route subassembly, gas circuit subassembly, finally realizes reaching the purpose of best cooling effect with minimum energy consumption.

Drawings

Fig. 1 is the schematic diagram of the structure of the water path and the gas path of the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Fig. 3 is a schematic top view of fig. 2.

Fig. 4 is a schematic structural diagram I of another embodiment of the present invention.

Fig. 5 is a schematic structural diagram II of another embodiment of the present invention.

Detailed Description

The following describes the specific contents of the present invention in detail with reference to fig. 1 to 5 by way of specific embodiments. This air side gas for air cooler mixes superfine atomizing enhancement heat transfer system including water route subassembly 1, gas circuit subassembly 2, monitoring control system 3.

On the premise of not changing the steel structure of the original fin bracket 42, the pipeline bracket 43 is fixed on the fin bracket 42 through bolts or welding, so that the nozzle is positioned at the position of the air cooler cylinder 44, and the water mist covers the air cooling fins 41 with the optimal coverage area.

The waterway assembly 1 comprises a water supply assembly 10 and a secondary filter 11 which are arranged at the front end of a water pump 14, a first waterway electric valve 12 and an exhaust valve 17 which are arranged at the rear end of the water pump 14, and a plurality of second waterway electric valves 18 which are arranged at the tail ends of pipelines of the waterway assembly 1; the water supply assembly 10 comprises a water tank 104 with a liquid level meter 105, a primary safety valve 101, a first electric valve 103 and a primary filter 102 which are arranged at the front end of the water tank 104, and a secondary safety valve 107 and a second electric valve 106 which are arranged at the rear end of the water tank 104.

The air path assembly 2 comprises an air compressor 24, a flow rate adjusting electric valve 23 arranged on an output pipeline of the air compressor 24 and a plurality of air path control valves 22 arranged at the tail ends of pipelines of the air path assembly 2.

To avoid the influence of the ambient temperature on the core components, the (centrifugal) water pump and the air compressor as well as the control system (parts other than the sensors) are usually arranged indoors.

The monitoring control system 3 includes an ambient temperature sensor 32, a humidity sensor 31, an air speed sensor 33, a wind direction sensor 34, a fin temperature sensor 35 (or a fan speed sensor, as long as the output power of the load can be directly or indirectly reflected), a hard disk for storing control data, and a CPU for processing data transmitted from each sensor and transmitting control signals. The monitoring control system is centralized control, can control the starting, stopping and rotating speed of the pump, and simultaneously controls the regulating valve, thereby controlling the corresponding pipeline or the high-pressure nozzle 13.

The tail ends of the water path component 1 and the gas path component 2 extend to be arranged at an air inlet below an air cooler inlet in parallel, the tail end of each water/gas path pipeline is provided with a corresponding electric valve for realizing intelligent control, and the pipeline material is selected from pressure-resistant grade PN1.6 materials, such as stainless steel. The pipeline support is fixed on original fin support steel construction, according to the jet angle and the distance of nozzle, confirms nozzle arrangement and pipeline interval for atomizing efflux covers evenly, and the coverage rate is 100%, and the efflux direction is the following air current direction.

Control data acquisition

The fin is mainly based on circulation of air in order to improve the radiating effect, but simultaneously, when wind-force was too big, also can influence the drop point of water smoke, causes its comprehensive cooling effect to be difficult to define, if continue to let in the cooling water this moment, will waste partial water resource certainly. For this purpose, the following method is used to carry out a standardized measurement and to generate a standardized curve from the measurement results, so that an optimal cooling strategy is achieved under different wind conditions.

In the experimental stage, environmental parameters including the temperature, the humidity, the wind speed, the wind direction and the like of the fins are collected under the full-load condition of the load equipment by simulating different seasons and layout heights. The influence factors of the seasons mainly include temperature and humidity, and the experiment takes humidity as a main influence factor because the humidity influences the heat conductivity coefficient of air. Different installation heights produce variations in wind direction and wind speed (wind force), which in turn is the main factor.

A single group of rotatable fins with a heating device is adopted, and the actual working conditions of the fins are simulated in a standardized parameter mode.

Selection of fin size: the high pressure nozzle can cover just the entire fin pack with the same throw distance (as it is actually used).

Setting of a heating device: the heating power of the heating device is ensured to be larger than the heat dissipation efficiency of the heat dissipation fins, and a temperature threshold T0 can be set. To simulate heating of the load.

Setting of nozzle injection amount: the fins spraying the mist can fall linearly from the temperature threshold. (neglecting the optimal air-water ratio) at the same time, the fan-shaped spraying area of the nozzle should just cover the fin group, and the nozzle should be positioned right above the center line of the fin, so as to eliminate the influence of the wind direction on the heat dissipation effect.

Humidity f (w) control curve: and (3) starting the heating device, closing the heating device after the temperature of the fins reaches a threshold T0 (the temperature is reduced to be below T0, the heating device is not started), under the condition of closing the fan (no wind condition), measuring the time T0 of naturally cooling the temperature of the fins from the temperature threshold T0 to the room temperature T1 by taking 1% as increment, and generating a control curve f0 (w).

Humidity/wind speed f (w/v) control curve: and (3) starting the heating device, closing the heating device after the temperature of the fins reaches a threshold T0 (the temperature is reduced to below T0, the heating device is not started), increasing the wind speed v of the fan step by taking 0.5m/s as increment, matching different humidity w conditions (taking 1% as increment), measuring the time T1 of naturally cooling the temperature of the fins from the temperature threshold T0 to the room temperature T1, and generating a control curve f1(w, v).

Humidity/wind speed f (w/v) simulation curve: and (3) starting the heating device, keeping constant temperature after the temperature of the fins reaches a threshold T0 (the temperature is reduced to below T0, and then starting the heating device), starting the atomizing nozzle, increasing the wind speed v of the fan step by taking 0.5m/s as increment, matching different humidity w conditions (taking 1% as increment), measuring the time T2 for cooling the temperature of the fins from the temperature threshold T0 to the set temperature T2, and generating a simulation curve f2(w, v).

And (4) result screening, fitting f1(w, v) and f2(w, v), extracting a value with the similarity of more than 90%, wherein the high similarity represents that the cooling effect is not greatly influenced by water mist spraying, and establishing a control data set by using the extracted data. If the humidity and wind power values of the environment fall into the data set, no water mist is needed for cooling.

Practical application in the field

In the high-temperature period in summer, when the environmental temperature is higher than the design temperature of the air cooler or the heat exchange performance cannot meet the production requirement, the auxiliary adjusting system can be started. Temperature, humidity transducer arrange in near air cooler environment, detect and judge that the system carries out real-time supervision to air circumstance humiture to whether combine air cooler operating parameter to judge and need strengthen heat transfer system and open, when ambient temperature is higher than air cooler design temperature or air cooling system has the needs, open this system.

And calculating the water consumption according to the detection data, thereby controlling the rotating speed of the pump and controlling the opening and closing of different branch valves. The water path and the gas path are combined at the high-pressure nozzle, and the two fluids are mutually disturbed to generate atomized jet flow of fine particles, wherein the average particle diameter is generally below 50 mu m. The enhanced heat exchange system can automatically adjust the proportion of water and gas according to the change of the environment and the operation parameters of the air cooler, and can judge whether to stop the operation of the equipment and close the electric valve after the environment adjustment meets the requirement. The pipeline is also provided with a water outlet, so that the medium can be emptied when the pipeline is not needed for a long time.

The method comprises the following specific steps:

step 1, opening a primary safety valve 101 and a first electric valve 103, supplementing water to a water tank 104, and stopping supplementing water when a liquid level meter 105 displays that the water level meets the use condition.

And 2, connecting a water inlet hose and a water outlet hose of the water pump 14, opening the secondary safety valve 107 and the second electric valve 106, and opening the electric valves of the corresponding pipelines through the control system.

And 3, starting the water pump 14 and the air compressor 24 in sequence, recording the water quantity and the air quantity by the water flow meter 15 and the air flow meter 21, calculating and judging the proportion of the required use quantity of the water and the gas by a program, and controlling the rotating speed of the water pump 14 and the adjustment use quantity of an electric valve by a monitoring control system so as to obtain the minimum water use quantity and the optimal atomization effect.

According to the determination of the optimal air-water ratio of the air-water atomizing nozzle published in steel vanadium-titanium in 2004 of Mei national morning, Wurong Yang, Mengdong Ji and the like, the given experimental result shows that the cooling intensity of the air-water spraying is determined by the cold characteristic parameters of the spraying, mainly including the water flow density, the size of fog drops and the impact speed of the fog drops, and the characteristic parameters can be changed by adjusting the working positions of water pressure and air pressure. Namely, the control of the cooling intensity can be realized by adjusting the air-water ratio. The higher the water pressure is, the smaller the value of the optimum gas-water ratio is. And several experimental examples are given: when the pressure is 0.2Mpa, the optimal gas-water ratio is 1.2; when the pressure is 0.25Mpa, the optimal gas-water ratio is 0.95; the optimal gas-water ratio is 0.8 at 0.3 MPa. If the gas-water ratio is required to be used under higher pressure, the gas-water ratio can be obtained by a similar experimental method according to a specific gas-water ratio derivation method given in the gas-water ratio derivation method.

Description of reference numerals:

1 waterway assembly

10 water supply assembly

101 first-stage safety valve

102 primary filter

103 first electric valve

104 water tank

105 liquid level meter

106 second electric valve

107 two-stage safety valve

11 two-stage filter

12 first waterway electric valve

13 high-pressure nozzle

14 Water pump

15 water flowmeter

17 evacuation valve

18 second waterway electric valve

2 gas circuit assembly

21 air flow meter

22 gas circuit electric valve

23 flow control electric valve

24 air compressor

3 monitoring control system

31 humidity sensor

32 temperature sensor

33 wind speed sensor

34 wind direction sensor

35 fin temperature sensor

4 Assembly structure subassembly

41 air cooling fin

42 fin support

43 pipeline support

44 air cooling fan cylinder

Claims (1)

1. An air side gas and water mixed micro-atomization enhanced heat exchange system for an air cooler comprises a water path assembly (1), a gas path assembly (2) and a monitoring control system (3);

the waterway assembly (1) comprises a water supply assembly (10) and a secondary filter (11) which are arranged at the front end of the water pump (14), a first waterway electric valve (12) and an exhaust valve (17) which are arranged at the rear end of the water pump (14), and a plurality of second waterway electric valves (18) which are arranged at the tail ends of pipelines of the waterway assembly (1); the water supply assembly (10) comprises a water tank (104) with a liquid level meter (105), a primary safety valve (101), a first electric valve (103) and a primary filter (102) which are arranged at the front end of the water tank (104), and a secondary safety valve (107) and a second electric valve (106) which are arranged at the rear end of the water tank (104);

gas circuit subassembly (2) include air compressor (24), set up flow control motorised valve (23) and a plurality of settings at terminal gas circuit control valve (22) of gas circuit subassembly (2) pipeline on air compressor (24) output line, its characterized in that:

the monitoring control system (3) comprises an ambient temperature sensor (32), a humidity sensor (31), a wind speed sensor (33), a wind direction sensor (34), a fin temperature sensor (35), a hard disk for storing control data, and a CPU for processing data transmitted by each sensor and sending control signals.

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