CN109621464B

CN109621464B - Antifreezing solution concentrating device for butt-joint open or closed heat source tower

Info

Publication number: CN109621464B
Application number: CN201910083051.8A
Authority: CN
Inventors: 刘赟
Original assignee: Hunan Huarui Wuji Energy Saving Technology Co ltd
Current assignee: Hunan Huarui Wuji Energy Saving Technology Co ltd
Priority date: 2019-01-27
Filing date: 2019-01-27
Publication date: 2024-04-05
Anticipated expiration: 2039-01-27
Also published as: CN109621464A

Abstract

The invention provides an antifreezing solution concentration device for a butt-joint open or closed heat source tower, which comprises an overflow control valve, a heating heat exchanger, a negative pressure evaporation chamber, a liquid outlet control valve, a water pumping device, a heating device, an exhaust control valve and a liquid level monitor, wherein the overflow control valve, the heating heat exchanger, the negative pressure evaporation chamber and the liquid outlet control valve are sequentially connected, and the water pumping device, the heating device, the exhaust control valve and the liquid level monitor are all arranged in the negative pressure evaporation chamber, wherein the overflow control valve and the liquid outlet control valve are connected with the heat source tower. The antifreeze concentration device provided by the invention can solve the problem of harm caused by the reduction of the antifreeze concentration of the closed or open heat source tower.

Description

Antifreezing solution concentrating device for butt-joint open or closed heat source tower

Technical Field

The invention relates to the technical field of heat source tower equipment, in particular to an antifreezing solution concentrating device for a butt-joint type or closed heat source tower.

Background

Coal electricity conversion has become the theorem, and steam electricity conversion is also a necessary trend. The trend can be considered from two aspects, firstly, from the environment protection, pure electric energy is free from any pollution to air, and the electric energy can drive the heat pump to push the low-temperature heat source to transfer to a high temperature, and the high energy efficiency ratio has an energy amplification effect which accords with the law of conservation of energy.

The consumed electric energy is not used for converting heat, but is used for promoting the heat of low-temperature air energy to be transferred to a high temperature, and the low-temperature heat energy can be utilized, so that the technology is quite mature, and in the development history of the heat pump technology, especially the heat source tower technology, the technology attracts great importance to each country, the technology is initially put into an implementation stage, and a plurality of commercial operation success cases are not lacked, the commercial operation needs to be considered from the economic benefit, and the market driving force is further increased as long as the economic benefit is brought to customers.

Therefore, the method can make objective and practical calculation, and look at the cost required by heating by using the natural gas boiler and look at the cost of the air energy heat source tower. We know that the natural gas can produce 8000-8500 kcal/m per prescription ³ The heat value of the boiler is lost by heat exchange of the gas boiler, and only 80 percent of the heat value can be utilized, because 20 percent of the heat energy is discharged along with the flue gas at about 130 ℃, and the utilization of the heat energy is very difficultThe recovery cost is expensive, and the actual heating value available for heating is 8500×0.8=6800 kcal, 3 yuan per cubic natural gas; if the 6800 large calorie heat value generated by adopting the air energy heat source tower technology needs to consume the electricity as follows, since 1 kw=860 large calorie, 6800 large calorie=7.9 kw heat value; however, the energy efficiency ratio of the air energy heat source tower is about 4 times, that is, 1kw of electric energy is consumed to generate 4kw of heat value, then the corresponding 7.9kw of heat value needs to consume electricity as follows, that is, the electricity consumption=7.9++4=1.98 kw of the same heating heat value is generated, then the air energy heat source tower cost=1.98X1=1.98 yuan (the electricity market price is calculated according to 1 yuan per degree), the cost of 6800 large-card heating heat value natural gas is 3 yuan, the energy consumption cost can be saved by 34 percent, the electricity per degree is calculated according to 1 yuan, the natural gas per cubic natural gas is calculated according to 3 yuan, the price of the natural gas is a non-renewable energy source, the natural gas tension of the present day has demonstrated the reason, along with the technological progress, the power generation method is approaching to clean energy sources more and more, and the power generation cost is lower, so the electricity price is not increased faster than the natural gas, and the price is even possible.

So the use of the heat source tower heating technology can bring three benefits to customers:

1. the energy cost can be saved by 34% for each winter of the user;

the utilization efficiency of the equipment can be fully developed, and the sharing of equipment resources is maximally realized;

2. the equipment investment and the equipment maintenance cost are reduced, the boiler equipment investment is not required to be increased, and the occupied space of the boiler equipment and the equipment room investment are reduced.

3. When the energy efficiency ratio of the heat pump unit is 2.6 times, the running cost of the boiler is equal to that of the heat pump unit, when the ambient temperature is higher than zero, the energy efficiency ratio of the heat source tower heat pump unit is generally 3.5 times, and when the ambient temperature is minus 30 ℃, the energy efficiency ratio of the high-efficiency overlapping heat pump unit can reach 3 times, and as the heat pump technology is gradually perfected, the energy efficiency ratio of the high-efficiency overlapping heat pump unit can be further improved, so that the high-efficiency overlapping heat pump unit has strong significance of energy conservation and emission reduction.

Aiming at the current air-cooled air-source heat pump, the following comparative analysis is carried out:

the air cooling is that the refrigerant exchanges heat with the air directly, the water cooling is that the refrigerant exchanges heat with the air indirectly through water, but the efficiency of the indirect-mode refrigerating unit is more than one time higher than that of the direct-heat-exchange refrigerating unit, and the efficiency is mainly determined by the following three factors:

1. the smaller the heat exchange end difference is, the higher the heat exchange efficiency is, namely, the higher the plate heat exchanger efficiency is than the shell-and-tube heat exchanger, namely, the end difference of the plate heat exchanger can reach 1 ℃, the maximum end difference of the shell-and-tube heat exchanger can be 5 ℃ (the temperature end difference can be 7 ℃ generally), the accumulated temperature end difference can be increased through indirect heat exchange of several heat exchange relay, the direct heat exchange with the air heat exchanger has certain advantages, the air cooling unit can directly exchange heat with the air, but the refrigerant inlet temperature of the condenser is generally 70 ℃ -90 ℃, the air outlet temperature is higher than 36 ℃ (when the ambient temperature is 35 ℃), the refrigerant outlet temperature is 42 ℃ -50 ℃, the characteristics of the air cooling condenser are determined by the ambient temperature, and the higher the ambient temperature is, the higher the condensing temperature is. The condensing temperature of the common air-cooled condenser is 7-12 ℃ higher than the ambient temperature, and the value of 7-12 ℃ is called heat exchange end difference. The higher the condensing temperature, the lower the refrigeration efficiency of the refrigeration unit, so we need to control the heat exchange end difference not to be too great. However, if the end difference of the heat exchange is not easy to be reduced, the heat exchange area of the air-cooled condenser and the circulating air quantity are greatly increased, the end difference is not obvious, and the manufacturing cost of the air-cooled condenser is higher. The temperature limit is not higher than 55 ℃ and not lower than 20 ℃. The condenser temperature of the water cooling unit is generally higher than the outlet temperature of cooling water by 2-4 ℃, the outlet temperature of cooling water is generally 37-40 ℃ when the outdoor temperature in summer is 35 ℃, the accumulated temperature end difference is obviously only 1-3 ℃, the accumulated temperature end difference is obviously much smaller than that of an air cooling unit, the efficiency is obviously higher, the accumulated temperature end difference is obviously much smaller than that of an air cooling direct heat exchange mode although an indirect heat exchange mode is adopted, the heat transfer coefficient of water is much larger than that of air, the heat transfer coefficient is undoubtedly, the required heat exchange area is much smaller under the condition of the same heat exchange scale, the air cooling unit technology is required to adopt a remedial mode, namely, a heat conducting fin is added on the air side of the condenser to solve the problem of unbalance between the refrigerant and the air heat exchange capacity, the water cooling unit does not exist, the contact area of water and the air is much larger than that of a tubular fin air cooling unit in a limited volume when the contact area of water drops and the air is adopted in a pure countercurrent mode, the evaporation area of the water cooling unit is much smaller than that of the tubular fin air cooling unit, the evaporation area of the water is much smaller than that of the air cooling unit in a limited volume, the water cooling unit is much lower than that of the air cooling unit, and the temperature of the water cooling unit is generally about 8.8.8, and the temperature of the water cooling unit is generally lower than the temperature of the water cooling unit is about 8.8. The principle of the heat pump is similar to that of a heat pump in winter, only pipeline switching is carried out to enable an evaporator to be in butt joint with an outdoor heat source tower, antifreeze fluid circulates between the evaporator and the heat source tower, water circulates between a condenser and the heat source tower, heating is carried out, the antifreeze fluid obtains latent heat of water vapor in air and sensible heat of the air, the antifreeze fluid is diluted to cause the temperature of a solution freezing point to move upwards, and the technology for concentrating dilute antifreeze fluid is key to the line and column technology.

2. The refrigerant operation mileage of the air cooling unit is much longer than that of the water cooling unit, a compressor is required to convey gaseous fluid, a circulating pump is required to convey liquid fluid, no matter the compressor or the circulating pump is required to overcome the pressure of the fluid and the resistance of a pipeline, the energy consumed by the circulating pump to convey the liquid fluid under the condition of conveying equal mass of fluid is much less than that consumed by the compressor to convey the gaseous fluid, the space occupied by the gaseous fluid with equal mass is more than tens of times that of the liquid fluid under the condition of the equal mass of fluid, the pressure of the fluid faced by the compressor is much higher than that faced by the pump (under the condition of the same pressure), and therefore, the power consumed by the compressor for working to overcome the pressure is definitely much more than that consumed by the pump. On the other hand, the larger the resistance of the long pipeline of the fluid operation mileage is, the larger the resistance of the surface area of the multi-pipeline of the occupied space is, so that the thermal power generation prefers to change exhaust steam into condensed water and disperse latent heat into air to waste, and the exhaust steam is not willing to be pressed into a boiler by a compressor to increase enthalpy so that the latent heat of the exhaust steam can be recycled, but only the condensed water is pumped into the boiler by a booster pump for recycling. The reason is the same, so that the low efficiency of the multi-unit is not difficult to explain, and especially the very poor effect of the tail end of the air conditioner which is far away from the multi-unit host is also explained, which is the same way as a rut. If water is used as a carrier of heat and cold energy to convey the cold energy and the heat energy by a pump, the water cooling unit has the advantage of being capable of conveying the cold energy or the heat energy in a long distance compared with an air cooling unit, thereby realizing large-scale refrigeration and heating and realizing large-scale heat exchange between the water cooling unit and air in a limited volume.

3. The third problem is that when the air cooling unit is used as a heat pump, the evaporator can generate frosting, when frosting is just started, the energy efficiency ratio can reach the highest, because a great amount of latent heat can be released by water vapor solidification in the air, the latent heat energy density can be more than tens times higher than the air sensible heat energy density, although the water vapor mass accounts for only 0.3% of the air, the latent heat can account for 25% of the whole air energy heat (more than 35% in the case of high humidity), the effect is very remarkable, the heating capacity can be drastically attenuated along with the increase of the thickness of the frost layer to a certain extent, the frost layer has poor heat conduction capacity, a frost blocking air channel is caused, and the natural heat exchange amount can be greatly reduced due to the reduction of the air intake. The air cooling unit adopts reverse operation to defrost, which seems to use the latent heat of water vapor in the air, and indeed, because the heat of defrosting is from a room, not only the experience of a user is affected, but also a lot of time is spent for defrosting, the defrosting energy consumption of the air cooling unit sometimes accounts for about one third of the whole energy consumption, and the situation that about 35 percent of the latent heat of water vapor in the air energy is not utilized is also proved, and the beneficial synergy is changed into harmful situation. If the problem of worldwide defrosting is solved, the latent heat of vapor in the air is changed into benefit, and the energy efficiency ratio of the heat pump unit can be improved by at least more than 25 percent. With the occurrence of heat source tower technology, the water-cooling unit is converted into a heat source tower heat pump unit, the evaporator of the heat source tower heat pump unit has no defrosting problem, but the situation that the evaporator is destroyed by the freezing pipe exists, because when the antifreeze is used as the heat transfer fluid, the antifreeze absorbs water vapor in the air under the condition that the temperature is lower than the ambient temperature to cause the upward movement of the freezing point temperature of the antifreeze, and when the temperature of the evaporator is reduced to the freezing point temperature of the concentration of the solution, the expansion event occurs, so that the energy efficiency ratio is greatly reduced by adopting a non-volatile evaporation concentration method, and more energy than water vapor can be obtained to evaporate and concentrate the antifreeze. The method is characterized in that the method is based on negative pressure cold evaporation, the investment cost is increased, the freezing pipe is difficult to prevent, the dilute antifreeze is difficult to be heated and evaporated and concentrated by adopting a heat pump mode or a solar energy method, the concentration mode depends on weather conditions, larger antifreeze storage equipment is needed, more space is occupied besides the increased cost, and water vapor can be lost again and again; thus, a second way is thought to prevent the occurrence of the freezing pipe event, and it appears that water vapor can be utilized, but the continuous addition of the antifreeze to prevent the occurrence of the freezing pipe event is at the cost of water and soil pollution, and it is difficult to ensure that an operator does not negligence, and whether the antifreeze is added under the condition of a specified concentration is ensured to not cause the occurrence of the freezing pipe event. There are more ways to solve these problems, and the technical solution for truly and effectively preventing the occurrence of the freezing tube event is certainly: the method can be used for realizing the actual utilization of the water vapor, the temperature of the dilute antifreeze solution is increased to reduce the negative pressure evaporation electricity consumption cost, the temperature of the sprayed water in condensation spraying is reduced to be more favorable for the improvement of the vacuum degree and the evaporation of the dilute antifreeze solution and the condensation of the water vapor, and the fourth is that the whole process is automated without intervention of operators, the freezing pipe event caused by human negligence can be completely avoided, and the fourth is that the method is more important, and the commercial operation of the heat source tower can be truly realized.

The heat source tower technology of nineties in the last century brings many dreams and rich opportunities to the line, some people leave from the line, but more people come in, even many large companies participate in the line, the line is truly popular, the line is continuously surrendered to be bright and colored, international companies are not known to begin to operate the field, the line comprises domestic sea, TCL, grid force and the like, the cake is in a jump-and-transition desire test, the withdrawer is in a top view, the technology is not too hard and sad, the importer tries to share the economic benefit in the future, the line is almost as much as many of the precursors in the prior development of the line, the continuous remirter has better technical scheme, and the final achievement is the people truly having continuous innovation capability. The statistics data of the related departments show that the actual cases are not next thousand, the number of the related inventions and the invention patents is tens, a plurality of cases bring bad impressions to users, the problems are more, and the cases with a plurality of success are of course attracting clients.

Therefore, people want to further improve the heat source tower technology, namely, the existing cooling tower is utilized to carry out adaptive reconstruction, so that rainwater prevention and solution corrosion resistance improvement are realized, the solution drift problem is solved, the antifreeze solution runs between the evaporator and the heat source tower, and the problem of defrosting does not exist, but the antifreeze solution has a new problem: the solution concentration of the antifreeze can be thinned because the antifreeze absorbs water vapor in the air, because the temperature of the antifreeze is always lower than the temperature of the ambient air, the water in the air is condensed in the antifreeze, the freezing point temperature of the solution can be moved upwards, freezing can occur when the freezing point temperature is moved upwards, the copper pipe of the evaporator is expanded, and huge economic loss is caused.

The frequent case of this distended copper tube becomes the pain point of the greatest rank. However, the method of adopting the concentrated antifreeze solution to prevent the situation that the freezing point temperature of the antifreeze solution is shifted upwards is thought to be present, and the electric heating rod is firstly adopted to evaporate the concentrated antifreeze solution, so that the consumption of the concentrated antifreeze solution is found to be huge, the concentrated antifreeze solution is obviously inexpensible, the concentrating method is abandoned soon, the event of expanding and damaging the copper pipe is prevented by adopting the antifreeze solution adding method, the operation cost is increased sharply, the pollution to water and soil is caused, and the environmental detection bureau is involved sooner or later. There is a concern that this line will be lost and broken in these impractical solutions, and will be choked by environmental authorities sooner or later.

Nevertheless, one does not want to discard the cake. Because of the large environment of changing coal into electricity and even changing gas into electricity, which is a development trend in the future, it is obvious that if the heat source tower can solve the problem of upward movement of freezing point temperature of the antifreeze, but not prevent the upward movement of freezing point temperature of the solution by adopting a non-environment-friendly mode of adding the antifreeze, and the replacement of traditional boiler heating by adopting a low-cost negative pressure evaporation concentration antifreeze mode is a daily-acceptable matter.

The current heat source tower array generates a series of related invention patents, and a plurality of related inventions and invention patents are still to be perfected in the implementation process, so that the problems of solution corrosion equipment, solution drift, pipe expansion and solution loss are solved. The dawn people see dawn on the heat source tower, and the huge energy saving potential attracts many related technological workers to study. The way of continuously adding the antifreezing solution is impossible to continue, because the method still eliminates the hidden danger of freezing pipes, water and soil can be polluted, the user is embarrassed about the trouble of adding the antifreezing solution, the operator is hard to be careless, and the freezing pipes are left carelessly. The problems of corrosion of the solution to the equipment are considered for those who use calcium chloride as the antifreeze, so that the equipment is in the first four to five years; the equipment using urea as the antifreeze is corroded almost five to six years, and the problem of solution crystallization also exists, so that the heat pump unit cannot normally operate. The traditional evaporation concentration method is unacceptable to users, and the energy consumed in the concentration process can even exceed the energy consumed by the heat pump host. The method adopts a heat pump mode to concentrate the dilute antifreeze solution, adopts solar energy to concentrate the dilute antifreeze solution, or is based on negative pressure wet evaporation, so that the investment cost of solution concentration equipment is increased, the energy consumption cost in the concentration process is high, water vapor in air can not be really utilized, the water vapor can be recycled in various concentration modes, and compared with an air-cooled heat pump unit, the method has no great advantage, because the antifreeze solution concentration modes are used for discharging the water vapor into the air again in a gaseous state, and only the water vapor can be really utilized in a condensed water discharging mode, the repeated concentration mode is called. Some areas can have water vapor accounting for more than 35% of the whole air energy, and if the heat pump unit can improve the efficiency by 35%, the heat pump unit is not easy, and the heat pump unit is advanced more than the air cooling unit, so that the heat pump unit has a wide prospect.

The humidity of air in each area is different, the relative humidity of the same area at different time is also changed, the humidity of the south area in China is much higher than that of the north area, the humidity is higher than that of the south area, the heat pump unit is beneficial and harmful, the technical method is adopted for treatment, if the existing reverse defrosting technology is adopted, the water vapor can be obviously not utilized and becomes very harmful, the defrosting is not needed by adopting the heat source tower technology without defrosting, the problem of the upward movement of the freezing point temperature can be encountered, the harm of the upward movement of the freezing point temperature is not solved, the copper tube of the evaporator is directly expanded, and the huge economic loss is caused.

For this reason, we must know what the water vapor content in air is, and in general, the absolute water vapor content in air varies according to the difference of the evaporation amount and the temperature of air, and the absolute humidity varies from one ten thousandth to one fortieth. Relative humidity is the ratio of the current water vapor content to the maximum water vapor content at a given temperature, given in percent, ranging from nearly 0% for dry hot air to 100% for fully saturated humid air, and water mist conditions. We need to deal with the fact that hot air can carry more water vapor than cold air. So that the relative humidity of the hot air is lower than that of the cold air even though the absolute humidity (actual water vapor content) is the same. Thus, we can raise the relative humidity of a bolus of air by cooling it. If the air is cooled to a sufficiently low temperature, the relative humidity may reach 100% and the saturation may condense into a cloud. This temperature is the dew point temperature.

When the temperature of the evaporator of the heat pump unit is reduced to the ambient dew point temperature, the evaporator fins are condensed, if the temperature is reduced continuously, frosting is formed, and the energy efficiency ratio of the heat pump unit is high in real time, so that the heat pump unit is very beneficial to the unit. When the ambient temperature is close to zero degree, frosting can occur on the evaporator, the efficiency of the heat pump unit can be maximized when frosting just begins, not only can the latent heat of gaseous state change into liquid state be obtained, but also the latent heat of liquid state change into solid state be obtained, when the thickness of the frost layer is gradually thickened, the heat conduction efficiency of the evaporator is reduced, more importantly, an air channel is blocked, the air inlet quantity is reduced, the heat exchange quantity is directly reduced, and therefore, the frosting is very harmful, and the problem of worldwide frosting is solved, so that the efficiency of the heat pump unit is improved by more than 25%.

And the average latent heat of water vapor in the air obtained by the general air energy heat pump is about 25% in the southern area according to the data statistics of the authority, and the average latent heat of water vapor in the air can be more than 35% in the areas with higher humidity, so that the amount of water vapor in the air is relatively less than about 15% in the northern area. If we calculate 25 kilocalories of latent heat according to 25% ratio, and how much condensed water is precipitated when 25 kilocalories of heat is released, we know that the latent heat of vaporization of water is 2257.2kJ/kg at 100 ℃ of one atmosphere (0.1 MPa), 2484.1kJ/kg at 0.001mpa,6.9491 ℃,1 kcal= 4.182 joules, 1 kcal= 4.182kJ, 25 kilocalories of heat=250000× 4.182 kj= 1045500kJ, so that condensed water= 1045500kJ/2484.1 kJ/kg=420 kg can be precipitated, and we have to configure a concentrating device to be able to concentrate and precipitate 420kg of condensed water per hour for one million large calorie heat pump units. For a water ring vacuum pump with the power of 5.5kw and the model of 2b-F111, the pumping rate is 3.83 cubic per minute when the vacuum degree is 3800pa and the solution temperature is 30 ℃, and if water vapor is pumped, 47 cubic per minute can be pumped, namely 229.8 cubic per hour of air can be pumped, when the antifreeze solution is 45 ℃, the gas phase vacuum degree is 95.8kpa, the gas phase is water vapor, and the density of the water vapor is 0.06543kg/m ³ The water vapor can be pumped to 6890m per hour ³ And/h. Mainly because the higher the temperature of the solution is, the higher the gas phase partial pressure is correspondingly, if the water vapor is sucked, the water vapor can be condensed in the circulating water, so the volume of the sucked water vapor can beMore than 99 times of air, thus water vapor can be pumped in 451kg/h per hour, and a heat source tower with 100 ten thousand large cards can be completely arranged by a 5.5kw water ring vacuum pump. If the model of the water jet condensing pump is PLB500, 500kg of water vapor can be pumped in each hour at the absolute pressure of 3066pa, the power of the prepared circulating pump is 5.5kw, and the model of the corresponding water jet vacuum pump is as follows: ZSWJ-100, at the same vacuum and spray cycle water temperature, if air is drawn, then the amount of air drawn per hour: 100/m ³ h, namely 129kg/h, which corresponds to 7.5kw of circulating pump power and 650kg/h of vapor can be pumped per hour for secondary vapor pumping, the mass of the pumped vapor is 5 times of the mass of the pumped air, and the mass of the pumped vapor is 99 times of the volume of air if calculated according to the vapor density in the corresponding vacuum environment, obviously, the pumped vapor is unreasonable according to volume calculation, the parameters on a nameplate generally refer to the how many cubic meters of the pumped vapor per hour and how many kilograms of the pumped vapor per hour, because the mass and the volume of the pumped air are different, because the vortex generated by the edge of the injected water column has a entrainment vapor effect which is much stronger than the entrainment air effect, because the vapor can condense into liquid water to be combined with circulating water to be much more tightly than the combination degree of air and water, the water column edge vacuum degree is much larger than that of air when sucking water vapor, so that the speed of sucking water vapor is much larger than that of sucking air, partial water molecules and air can escape from circulating water under the corresponding vacuum environment, the higher the vacuum degree is, the higher the escape amount of circulating water temperature is, the larger the escape amount of circulating water temperature is, when entrainment and escape reach dynamic balance, the constant water vapor or air sucking capacity is maintained, the vacuum degree is enhanced if the entrainment effect is stronger than the escape effect, the suction capacity is also increased, and if the temperature of the injected circulating water enters the ejector exceeds 38 ℃, the ejector can lose the suction capacity basically when the water vapor escapes from the circulating water continuously, and the air escape speed is faster than the water vapor escape. Compared with the consumption of 5.5kw per hour of 25 ten thousand calorie heat, even if the heat energy compensation of the antifreeze fluid is needed The power consumption of 3000w is 8.5kw when the temperature is raised to 41 ℃ or above, the energy efficiency ratio is about 34 times, namely 34 times of energy efficiency ratio can be obtained by utilizing the two modes to concentrate the antifreeze and obtain the water vapor latent heat 250000 Daka=250000×1000/860=290.1 kw and 8.5kw in the air. Assuming that the temperature of the antifreeze fluid is 0 ℃ from the evaporator, the temperature of the circulating water is 45 ℃, the concentrated dilute antifreeze fluid is 200kg, the circulating water is 250kg, the circulating water at 45 ℃ enters the heat energy feedback heat exchanger to exchange heat with the dilute antifreeze fluid at the other side, the temperature of the circulating water is reduced to about 20 ℃ when the circulating water exits the heat energy feedback heat exchanger, the temperature of the dilute antifreeze fluid is continuously increased to more than 20 ℃, the circulating water is heated to a certain degree, the temperature of the dilute antifreeze fluid is increased to a certain degree, the temperature of the circulating water is increased to a certain degree, the temperature of the dilute antifreeze fluid is increased to be higher than 35 ℃, the temperature of the circulating water is increased to the maximum, and the temperature of the circulating water is increased to the maximum degree, and the temperature of the dilute antifreeze fluid is required to be heated to be higher than the 45 ℃ by the circulating water, and the circulating water is heated to the left side by the circulating water heater, and the circulating device is not required to be balanced, and the heat of the antifreeze fluid can be supplied to the circulating water is heated by the circulating device. Since the evaporation amount of the dilute antifreeze solution is small below 20 ℃, the required vacuum degree is also relatively high, and therefore the dilute antifreeze solution must be further warmed. Another way is to use an electric heating rod or the hot fluid from the condenser of the heat pump unit to directly heat the dilute antifreeze solution, and the heating mode does not need a solution heating circulating pump, but the heating speed is relatively slow. The best method is to heat the circulating water, then the heated circulating water is continuously conveyed into a heat energy feedback heat exchanger through a jet circulating pump or a water ring vacuum pump, and heat is exchanged with the dilute antifreeze pumped in from the other side through the solution heating circulating pump. When the temperature of the dilute antifreeze solution discharged from the evaporator is below-15 ℃, 300kg of 45 ℃ circulating water is required to be provided for heating 200kg of dilute antifreeze solution at-15 ℃, the heating device is almost as large as the 0 ℃ antifreeze solution, and the circulating time of the solution heating circulating pump is relatively long. If the temperature of the antifreeze solution exiting the evaporator is higher than 5 ℃, the temperature of the circulating water entering the condensing ejector or the water ring vacuum pump may be higher than 30 ℃, and if the temperature of the circulating water exiting the ejector is higher than 45 ℃, the temperature of the circulating water must be considered to be reduced, and a cooling device for reducing the circulating water must be arranged, so that the evacuation of the circulating water becomes more and more difficult when the temperature of the circulating water exiting the heat energy feedback heat exchanger is higher than 30 ℃.

There are a number of related antifreeze concentrate patents filed for this purpose, comparative analyses are given here by way of example, which are: "a vapor energy latent heat feedback solution concentration system" (patent number: 201810863778.3); the patent package obviously does not utilize the condition that the quantity of solution is increased and overflow is caused by diluting the antifreeze by utilizing the water vapor, can utilize the overflow mode of the dilute antifreeze to realize the control of the whole-course automatic concentrated antifreeze, and also does not consider the problem that the antifreeze cannot flow into a negative pressure evaporation chamber due to air blockage caused by the arrangement of an exhaust valve and the difficulty of evacuating a condensation ejector caused by too low evaporation speed of the antifreeze when the temperature of the antifreeze is too low, and does not consider the problem that the injection steam efficiency is low due to the too high injection circulating water temperature. The cooling and heating unit and the antifreezing solution concentration device (patent number: 201811111377.9; invention 201821553797.8) adopt a dilute antifreezing solution overflow mode to enter a negative pressure evaporation chamber instead of a heat exchanger, but the negative pressure evaporation chamber is internally provided with a spiral tube type heat exchanger to realize the feedback of the latent heat of the water vapor energy into the solution, but the evaporation difficulty caused by the exhaust problem and the insufficient temperature of the dilute solution is not considered, and a solution heating circulating pump is not considered to fully improve the temperature of the dilute antifreezing solution by utilizing the heat of circulating water. The "air-source heat pump concentrating device 201811042693.5" and the "air-source heat pump solution concentrating device 201821462000.3" are similar to the above-mentioned patent package principle and flow, in which the air extractor consisting of the condensation ejector and the jet circulation pump is changed into a water-ring vacuum pump, and the exhaust problem is not considered, and the heat energy compensation of the dilute antifreeze solution and the improvement of the temperature of the dilute antifreeze solution by setting the solution heating circulation pump are not considered, so that the evaporation speed of the dilute antifreeze solution is accelerated, and the problem of the improvement of the vacuum degree or the efficiency of the condensed water vapor by cooling the circulating water is not considered. The invention patent applied in the earlier stage has the common characteristic that water vapor can be recovered, but high-efficiency concentration of the antifreeze cannot be realized, no matter a condensation ejector vacuumizing mode is adopted to realize the concentration of the antifreeze, or a water ring vacuum pump is adopted for negative pressure evaporation, the high-efficiency concentration is quite poor, that is, the antifreeze temperature can be quite low under the condition of lower environment temperature, the vacuum degree requirement of the vacuum evaporation concentration is quite high under the condition of lower antifreeze temperature, the water ring vacuum pump is quite good under the higher vacuum degree, or a condensation jet vacuum pump is quite low, a lot of energy consumption cost is paid, the sealing performance of equipment is also enhanced, and therefore, the heating of the dilute antifreeze is not enough only by adopting a thermal energy feedback mode. Therefore, the invention adopts the heat of fluid in an electric heating rod or a condenser to raise the temperature of the antifreeze to at least maintain the temperature of the dilute antifreeze to above 35 ℃, and can also realize heat energy feedback in a system to recycle heat energy, but the invention patent related to the comparative antifreeze concentration is not so, and the invention patent only aims at an open heat source tower, but does not consider defrosting of a closed heat source tower, and does not consider heating by adopting a dilute antifreeze circulation mode.

The problem that the fins are frosted is also encountered in the prior closed heat source tower like the related technology of heat exchange with wide fins and small temperature difference, the heat conduction performance of the fins is seriously affected, even the heat pump unit cannot normally operate, if frost on the fins is melted by adopting the antifreeze, the problem that the freezing point temperature of the antifreeze is moved upwards is also caused, the problem that the antifreeze is concentrated and thin antifreeze is encountered, the method of adding the concentrated antifreeze is absolutely not preferable, the traditional evaporative concentration antifreeze is obviously less cost-effective, even if the low-temperature antifreeze in the heat pump mode is used for heating the heat exchanger of the closed heat source tower, the low-temperature antifreeze can be heated to be above zero degree by taking a long time, the heating work is stopped, the antifreeze temperature in the heat exchanger of the heat source tower in north is lower than-20 ℃, if the antifreeze temperature of the antifreeze is required to be heated to be above zero degree, the heat storage and cooling loss is caused by adopting the heat storage heating antifreeze, and the heat of warm medium water is not used for defrosting, the user experience is quite poor, and the related patents are as follows: "steam suspension condensation heat source tower heat pump heat supply station, patent number: 2018108813893"," wet cold and heat source secondary refrigerant heat pump noise insulation heat supply station, patent number: 2018108815687 "this is well verified in the relevant case.

Accordingly, there is a need to provide a new antifreeze concentrate apparatus for a butt-joint type or closed heat source tower that solves the above-mentioned problems.

Disclosure of Invention

The invention solves the technical problem of providing an antifreezing solution concentration device for a butt-joint type or closed heat source tower so as to solve the technical problem caused by the reduction of the concentration of the antifreezing solution.

In order to solve the technical problems, the antifreeze concentration device for the butt-joint type or closed heat source tower comprises an overflow control valve, a heating heat exchanger, a negative pressure evaporation chamber, a liquid outlet control valve, a vapor pumping device, a heating device, an exhaust control valve and a liquid level monitor, wherein the overflow control valve, the heating heat exchanger, the negative pressure evaporation chamber and the liquid outlet control valve are sequentially connected, and the vapor pumping device, the heating device, the exhaust control valve and the liquid level monitor are all arranged in the negative pressure evaporation chamber, and the overflow control valve and the liquid outlet control valve are connected with the heat source tower;

when the antifreeze concentrate device is in a use state, the antifreeze overflows from the heat source tower and enters the negative pressure evaporation chamber through the overflow control valve and the heating heat exchanger;

When the liquid level monitor detects that the liquid level of the antifreeze in the negative pressure evaporation chamber rises to a preset first height value, the liquid level monitor closes the exhaust control valve and the overflow control valve and starts the temperature rising device and the vapor pumping device;

the water vapor pumping device is used for pumping water vapor and air in the negative pressure evaporation chamber, and the temperature rising device is used for increasing the temperature of the antifreeze in the negative pressure evaporation chamber;

when the liquid level monitor detects that the liquid level in the negative pressure evaporation chamber is reduced to a preset second height value, the liquid level monitor controls the liquid outlet control valve to be opened;

when the liquid level monitor detects that the liquid level in the negative pressure evaporation chamber is reduced to a preset third height value, the liquid level monitor controls the liquid outlet control valve to be closed, and the exhaust control valve and the overflow control valve to be opened.

Preferably, the antifreeze concentration device further comprises a first temperature controller, and when the first temperature controller detects that the temperature of the antifreeze in the negative pressure evaporation chamber rises to a preset first temperature value, the first temperature controller controls the temperature rising device to be closed.

Preferably, the temperature raising device is a heating circulating pump, and the temperature raising device is used for sending the antifreeze in the negative pressure evaporation chamber into the temperature raising heat exchanger again.

Preferably, the temperature raising device is a heating device or a heating heat exchanger, and the temperature raising device is arranged in the negative pressure evaporation chamber.

Preferably, the antifreeze concentration device further comprises a liquid storage tank, and the vapor pumping device is further used for sending the warming liquid flowing out of the warming heat exchanger into the liquid storage tank and sending the warming liquid in the liquid storage tank into the warming heat exchanger again.

Preferably, the vapor pumping device comprises a condensation ejector and an injection circulating pump which are connected with each other, the condensation ejector is communicated with the negative pressure evaporation chamber and the liquid storage tank, and the temperature rising heat exchanger is communicated with the injection circulating pump and the liquid storage tank.

Preferably, the water pumping device is a water ring vacuum pump, the water ring vacuum pump is communicated with the negative pressure evaporation chamber and the liquid storage tank, and the heating heat exchanger is communicated with the water ring vacuum pump and the liquid storage tank.

Preferably, the antifreeze concentration device further comprises a cooling heat exchanger, and the cooling heat exchanger is used for reducing the temperature of the warming liquid flowing out of the liquid storage tank.

Preferably, the antifreeze concentration device further comprises a heating component, and the heating component is used for increasing the temperature of the warming liquid in the liquid storage tank.

In the antifreeze concentrate device for the butt-joint open or closed heat source tower, antifreeze overflows from the heat source tower through the tray, and enters the negative pressure evaporation chamber through the overflow control valve and the temperature-rising heat exchanger; at this time, the exhaust control valve is in an open state, the antifreeze fluid enters the negative pressure evaporation chamber, and the air in the negative pressure evaporation chamber is discharged from the exhaust control valve;

when the liquid level monitor detects that the liquid level of the antifreeze in the negative pressure evaporation chamber rises to a preset first height value, the liquid level monitor closes the exhaust control valve and the overflow control valve and starts the temperature rising device and the vapor pumping device; the water vapor pumping device pumps air in the negative pressure evaporation chamber to enable the negative pressure evaporation chamber to be in a negative pressure state, and the antifreeze can automatically evaporate water vapor in the antifreeze under the negative pressure state so as to improve the concentration of the antifreeze; the water vapor is discharged in time by the water vapor pumping device, and meanwhile, the temperature of the antifreeze fluid drops in the process of evaporating the self water vapor; the temperature rising device can raise the temperature of the antifreeze fluid to keep the antifreeze fluid at a proper concentration temperature;

When the liquid level monitor detects that the liquid level in the negative pressure evaporation chamber is reduced to a preset second height value, the liquid level monitor controls the liquid outlet control valve to be opened; thereby timely outputting the antifreeze with proper concentration;

when the liquid level monitor detects that the liquid level in the negative pressure evaporation chamber is reduced to a preset third height value, the liquid level monitor controls the liquid outlet control valve to be closed, and the exhaust control valve and the overflow control valve to be opened; so as to facilitate the new round of concentration of the antifreeze after the new antifreeze is introduced.

Drawings

Fig. 1 is a schematic structural view of a first embodiment of an antifreeze concentrate apparatus for a dock-open or closed heat source tower according to the present invention;

fig. 2 is a schematic structural view of a second embodiment of an antifreeze concentrate device for a dock-open or closed heat source tower according to the present invention;

FIG. 3 is a schematic view of a third embodiment of an antifreeze concentrate device for a dock-open or closed heat source tower according to the present invention;

fig. 4 is a schematic structural view of a fourth embodiment of an antifreeze concentrate device for a dock-open or closed heat source tower according to the present invention;

fig. 5 is a schematic structural view of a fifth embodiment of an antifreeze concentrate device for a dock-open or closed heat source tower according to the present invention;

Fig. 6 is a schematic structural view of a sixth embodiment of an antifreeze concentrate device for a dock-open or closed heat source tower according to the present invention;

fig. 7 is a schematic structural view of a seventh embodiment of an antifreeze concentrate device for a butt-joint type or closed heat source tower according to the present invention.

Reference numerals illustrate:

100/200/300/400/500/600/700-antifreeze concentrate apparatus for interfacing open or closed heat source towers;

1 a-tower body;

the device comprises a 1-tray, a 2-overflow control valve, a 3-heating heat exchanger, a 4-negative pressure evaporation chamber, a 5-heat source tower circulating pump, a 5 c-spray pipe circulating pump, a 6-spray pipe and a 7-liquid outlet control valve;

8-pumping steam device, 4 a-heating device, 4 b-exhaust control valve, 4 c-liquid level monitor and 4 d-first temperature controller;

9-liquid storage tank and 9 a-heat exchanger in the tower; 9 b-a heating assembly, 9 c-a cooling heat exchanger;

81-condensing ejector, 82-jet circulation pump;

91-a box body and 92-an overflow pipe;

9b 1-heater, 9b 2-second temperature controller.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.

The invention provides an antifreezing solution concentrating device for a butt-joint open or closed heat source tower.

First embodiment

Referring to fig. 1, the heat source tower is an open heat source tower, the heat source tower includes a tower body 1a, a tray 1, a heat source tower circulating pump 5 and a spray pipe 6, the tray 1 is disposed at the bottom end of the tower body 1a, the spray pipe 6 is suspended in the tower body 1a, and the heat source tower circulating pump 5 and the spray pipe 6 are all communicated with an evaporator of a heat pump unit.

Based on the above hardware conditions, a first embodiment of the present invention is provided, which is an antifreeze concentration device 100 for a butt-joint type or closed heat source tower, and includes an overflow control valve 2, a heating heat exchanger 3, a negative pressure evaporation chamber 4, a liquid outlet control valve 7, a vapor pumping device 8, a heating device 4a, an exhaust control valve 4b, and a liquid level monitor 4c, wherein the overflow control valve 2, the heating heat exchanger 4a, the negative pressure evaporation chamber 4, and the liquid outlet control valve 7 are sequentially connected, and the vapor pumping device 8, the heating device 4a, the exhaust control valve 4b, and the liquid level monitor 4c are all disposed in the negative pressure evaporation chamber 4, and the overflow control valve 2 and the liquid outlet control valve 7 are all connected with the heat source tower;

When the antifreeze concentrate device is in a use state, the antifreeze overflows from the heat source tower and enters the negative pressure evaporation chamber 4 through the overflow control valve 2 and the heating heat exchanger 3;

when the liquid level monitor 4c detects that the liquid level of the antifreeze in the negative pressure evaporation chamber 4 rises to a preset first height value, the liquid level monitor 4c closes the exhaust control valve 4b and the overflow control valve 2, and starts the temperature raising device 4a and the vapor pumping device 8;

the water vapor pumping device 8 is used for pumping water vapor and air in the negative pressure evaporation chamber 4, and the temperature rising device 4a is used for increasing the temperature of the antifreeze in the negative pressure evaporation chamber 4;

when the liquid level monitor 4c detects that the liquid level in the negative pressure evaporation chamber 4 is reduced to a preset second height value, the liquid level monitor 4c controls the liquid outlet control valve 7 to be opened;

when the liquid level monitor 4c detects that the liquid level in the negative pressure evaporation chamber 4 is reduced to a preset third height value, the liquid level monitor 4c controls the liquid outlet control valve 7 to be closed, and the exhaust control valve 4b and the overflow control valve 2 to be opened.

It will be appreciated that in this embodiment, the overflow control valve 2 is in communication with the tray 1, and the liquid outlet control valve 7 is in communication with the heat source tower circulation pump 5. As a preferable mode of this embodiment, the exhaust control valve 4b is provided at the top end of the negative pressure evaporation chamber 4, and the vapor pumping device 8 communicates with the top end of the negative pressure evaporation chamber 4.

The control principle of the antifreeze concentrate device for the butt-joint open or closed heat source tower provided by the invention is as follows:

the antifreeze fluid overflows from the heat source tower 1a through the tray 1, and enters the negative pressure evaporation chamber 4 through the overflow control valve 2 and the temperature rising heat exchanger 3; at this time, the exhaust control valve 4b is in an open state, the antifreeze fluid enters the negative pressure evaporation chamber 4, and the air in the negative pressure evaporation chamber 4 is discharged from the exhaust control valve 4 b;

when the liquid level monitor 4c detects that the liquid level of the antifreeze in the negative pressure evaporation chamber 4 rises to a preset first height value, the liquid level monitor 4c closes the exhaust control valve 4b and the overflow control valve 2, and starts the temperature raising device 4a and the vapor pumping device 8; the water vapor pumping device 8 pumps air in the negative pressure evaporation chamber 4, so that the negative pressure evaporation chamber 4 is in a negative pressure state, and the antifreeze can automatically evaporate water vapor in the antifreeze under the negative pressure state, thereby realizing the improvement of the concentration of the antifreeze; the water vapor pumping device 8 discharges water vapor in time, and meanwhile, the temperature of the antifreeze fluid drops in the process of evaporating self water vapor; the temperature raising device 4a can raise the temperature of the antifreeze to maintain the antifreeze at a proper concentration temperature;

When the liquid level monitor 4c detects that the liquid level in the negative pressure evaporation chamber 4 is reduced to a preset second height value, the liquid level monitor 4c controls the liquid outlet control valve to be opened; thereby timely outputting the antifreeze with proper concentration;

when the liquid level monitor 4c detects that the liquid level in the negative pressure evaporation chamber 4 is reduced to a preset third height value, the liquid level monitor 4c controls the liquid outlet control valve to be closed, and the exhaust control valve 4b and the overflow control valve 2 to be opened; so as to facilitate the new round of concentration of the antifreeze after the new antifreeze is introduced.

Preferably, the antifreeze concentration device 100 may further include a first temperature controller 4d, and the first temperature controller 4d controls the temperature increasing device 4a to be turned off when the first temperature controller 4d detects that the temperature of the antifreeze increases to a preset first temperature value.

In this embodiment, the temperature raising device 4a is a heating circulation pump, and the temperature raising device 4a is used for sending the antifreeze in the negative pressure evaporation chamber 4 into the temperature raising heat exchanger 3 again. In this embodiment, the heating liquid is circulating water.

It will be appreciated that in other embodiments, the temperature raising device 4a may be a heating device or a heating heat exchanger, and the temperature raising device 4a is disposed in the negative pressure evaporation chamber 4.

In this embodiment, the antifreeze concentration device 100 further includes a liquid storage tank 9, and the vapor pumping device 8 is configured to send the warmed liquid flowing out of the warmed heat exchanger 3 into the liquid storage tank 9, and send the warmed liquid in the liquid storage tank 9 into the warmed heat exchanger 3 again.

In this embodiment, the vapor pumping device 8 includes a condensation injector 81 and an injection circulation pump 82 that are connected to each other, the condensation injector 81 communicates with the top end of the negative pressure evaporation chamber 4 and the liquid storage tank 9, and the temperature-raising heat exchanger 3 communicates with both the injection circulation pump 82 and the liquid storage tank 9.

As a preferred mode of this embodiment, the antifreeze concentration device 100 further includes a heating unit 9b, and the heating unit 9b is configured to raise the temperature of the temperature raising liquid in the liquid storage tank 9.

Further, the heating assembly 9b includes a heater 9b1 and a second temperature controller 9b2, when the second temperature controller 9b2 detects that the temperature rising liquid in the liquid storage tank 9 is unchanged in a preset time period, the temperature value is lower than a preset second temperature value, and the second temperature controller 9b2 starts the heater 9b1. The heater 9b1 and the second temperature controller 9b2 may be separately provided or may be integrally provided.

The control principle of the heating assembly 9b is as follows:

with the concentration of the antifreeze, the evaporated vapor enters the liquid storage tank 9 along with the condensation injector 81;

the heat of the water vapor is also brought into the warming liquid in the liquid storage tank 9, and the heat of the warming liquid and the antifreezing liquid can be balanced gradually along with the continuous heat exchange of the warming liquid entering the warming heat exchanger 3 and the antifreezing liquid;

when it is still necessary to further raise the temperature of the antifreeze, the heating assembly 9b may be activated to heat the warmed liquid in the liquid storage tank 9.

It will be appreciated that in other embodiments, the pumping device may be a water ring vacuum pump, the water ring vacuum pump is communicated with the top end of the negative pressure evaporation chamber 4 and the liquid storage tank 9, and the heating heat exchanger 3 is communicated with both the water ring vacuum pump and the liquid storage tank 9.

In this embodiment, the liquid storage tank 9 includes a tank 91 and an overflow pipe 92, the overflow pipe 92 is disposed on the upper portion of the tank 91, in the process of condensing the antifreeze, the evaporated water vapor enters the liquid storage tank 9 through the vapor pumping device 8, and the water vapor can be discharged from the overflow pipe 92 in a liquid water form, rather than in a gaseous form, so as to ensure that the heat carried in the water vapor is retained in the tank 91, and the water vapor can be recovered.

In this embodiment, the liquid level monitor 4c may be a float ball or a travel switch or a float ball travel switch.

In this embodiment, the heating heat exchanger 3 is a heat energy feedback heat exchanger. The heat source tower is an open heat source tower.

The heat source tower circulating pump 5 and the spray pipe 6 are communicated through an evaporator of the heat pump unit.

The concentrated antifreeze fluid is pumped into an evaporator of the heat pump unit through a liquid outlet control valve 7 and a heat source tower circulating pump 5;

heat exchange is carried out with other antifreeze and the refrigerant at the other side of the evaporator, and the temperature of the antifreeze is reduced after heat exchange;

then spraying by a spray pipe 6 from an evaporator pipeline into the heat source tower 1a, wherein the spraying process of the antifreeze solution is to perform countercurrent heat exchange with the air in the heat source tower 1 a;

the heat exchange with the air in countercurrent not only absorbs the sensible heat in the air, but also absorbs the latent heat of water vapor in the air, and the concentration of the antifreeze solution becomes thin, the solution quantity is increased, and the increased solution quantity flows through the overflow pipe electric control valve in an overflow mode to enter the temperature rising heat exchanger 3 and the negative pressure evaporation chamber 4;

thereby continuously realizing continuous unmanned control of automatic concentration of the antifreeze liquid.

Second embodiment

Referring to fig. 2, according to the first embodiment of the present invention, an antifreeze concentrate apparatus 100 for a butt-joint type or closed type heat source tower is provided, and in a second embodiment of the present invention, an antifreeze concentrate apparatus 200 for a butt-joint type or closed type heat source tower is provided, wherein the temperature raising heat exchanger 3 is a plate heat exchanger.

Third embodiment

Referring to fig. 3, according to the first embodiment of the present invention, an antifreeze concentrate apparatus 100 for a butt-joint type or closed type heat source tower is provided, and in a third embodiment of the present invention, an antifreeze concentrate apparatus 300 for a butt-joint type or closed type heat source tower is provided, which is different in that a cooling heat exchanger 9c is further included, where the cooling heat exchanger 9c is used for reducing the temperature of the heating liquid flowing out from the liquid storage tank 9.

The two ends of the cooling heat exchanger 9c are respectively connected with the heat source tower circulating pump 5, and preferably, one end of the cooling heat exchanger 9c adjacent to the outlet end of the heat source tower circulating pump 5 is provided with a control valve.

When the ambient temperature is relatively high, the temperatures of the antifreeze and the warming liquid are increased along with the outside air temperature, so that the normal operation of the vapor pumping device 8 is affected.

In particular, when the temperature of the antifreeze exceeds 5 ℃, the temperature of the warmed liquid is led to be higher than 35 ℃ out of the warmed heat exchanger 3, so that the condensation injector 81 is unfavorable in pumping water vapor or cannot play a sealing role on the water ring vacuum pump.

In this embodiment, the temperature increasing device 4a is preferably a heating circulation pump.

Fourth embodiment

Referring to fig. 4, an antifreeze concentrate apparatus 300 for a butt-joint type or closed type heat source tower according to a third embodiment of the present invention is provided, and in a fourth embodiment of the present invention, an antifreeze concentrate apparatus 400 for a butt-joint type or closed type heat source tower is provided, wherein the temperature raising device 4a is preferably a heating device.

Fifth embodiment

Referring to fig. 5, in the present embodiment, the heat source tower is a closed heat source tower. The heat source tower comprises a tower body 1a, a tray 1, a heat source tower circulating pump (not shown), a spray pipe circulating pump 5c, a spray pipe 6 and an in-tower heat exchanger 9a, wherein the tray 1 is arranged at the bottom end of the tower body 1a, the spray pipe 6 is suspended in the tower body 1a, the in-tower heat exchanger 9a is also suspended in the tower body 1a and is positioned between the tray 1 and the spray pipe 6, the spray pipe circulating pump 5c is communicated with the spray pipe 6 and the tray, and the heat source tower circulating pump is communicated with the in-tower heat exchanger 9c and an evaporator of a heat pump unit.

Based on the above hardware conditions, an antifreeze concentrate apparatus 500 for a butt-joint open or closed heat source tower according to a fifth embodiment of the present invention includes an overflow control valve 2, a heat-raising heat exchanger 3, a negative pressure evaporation chamber 4, a liquid outlet control valve 7, a vapor pumping device 8, a heat-raising device 4a, an exhaust control valve 4b, and a liquid level monitor 4c, wherein the overflow control valve 2, the heat-raising heat exchanger 4a, the negative pressure evaporation chamber 4, and the liquid outlet control valve 7 are sequentially connected, and the vapor pumping device 8, the heat-raising device 4a, the exhaust control valve 4b, and the liquid level monitor 4c are all disposed in the negative pressure evaporation chamber 4, and the overflow control valve 2 and the liquid outlet control valve 7 are all connected with the heat source tower;

It will be appreciated that in this embodiment, the overflow control valve 2 is in communication with the tray 1, and the outlet control valve 7 is in communication with the shower circulation pump 5 a.

As a preferable mode of this embodiment, the exhaust control valve 4b is provided at the top end of the negative pressure evaporation chamber 4, and the vapor pumping device 8 communicates with the top end of the negative pressure evaporation chamber 4.

Preferably, the antifreeze concentration device 500 may further include a first temperature controller 4d, and the first temperature controller 4d controls the temperature increasing device 4a to be turned off when the first temperature controller 4d detects that the temperature of the antifreeze increases to a preset first temperature value.

In this embodiment, the antifreeze concentration device 500 further includes a liquid storage tank 9, and the vapor pumping device 8 is configured to send the warmed liquid flowing out of the warmed heat exchanger 3 into the liquid storage tank 9, and send the warmed liquid in the liquid storage tank 9 into the warmed heat exchanger 3 again.

As a preferred mode of this embodiment, the antifreeze concentrate apparatus 500 further includes a heating unit 9b, and the heating unit 9b is configured to raise the temperature of the temperature raising liquid in the liquid storage tank 9.

The control principle of the heating assembly 9b is as follows:

It will be appreciated that in other embodiments, the pumping device 8 may be a water ring vacuum pump, the water ring vacuum pump is communicated with the top end of the negative pressure evaporation chamber 4 and the liquid storage tank 9, and the heating heat exchanger 3 is communicated with both the water ring vacuum pump and the liquid storage tank 9.

In this embodiment, the heating heat exchanger 3 is a heat energy feedback heat exchanger. The heat source tower is a closed heat source tower. The heat exchanger 9a in the tower is connected with the evaporator of the heat pump unit through an evaporator removing pipeline and a heat source tower circulating pump to form an antifreezing solution internal circulating system. The spray pipe 6 is connected with the heat source tower circulating pump 5 through a pipeline to form a defrosting and antifreezing fluid external circulating system, so that a unified coordination system of defrosting and antifreezing fluid circulation inside and outside the antifreezing fluid of the closed heat source tower 1a is formed, the internal antifreezing fluid circulating system is used for transmitting air energy, and the external defrosting and antifreezing fluid circulating system is used for dissolving frost layers on fins of the heat exchanger 9a in the tower.

Sixth embodiment

Referring to fig. 6, according to the antifreeze concentrating device 500 provided by the fifth embodiment of the present invention, the antifreeze concentrating device 600 provided by the sixth embodiment of the present invention is different in that the antifreeze concentrating device 600 may also include a cooling heat exchanger 9c, and the cooling heat exchanger 9c is used for reducing the temperature of the heating liquid flowing out of the liquid storage tank 9.

In this embodiment, the cooling heat exchanger 9c is disposed inside the liquid storage tank 9, and two ends of the cooling heat exchanger 9c are communicated with an evaporator of the heat pump unit. The cooling principle of the present embodiment is the same as that of the third embodiment of the present invention, and will not be described here again.

In this embodiment, the temperature raising device 4a is a heating heat exchanger, the heating heat exchanger is disposed in the negative pressure evaporation chamber 4, the heating heat exchanger is communicated with a condenser of the heat pump unit, and heating medium water with a higher temperature of the condenser enters the heating heat exchanger, so that the antifreeze in the negative pressure evaporation chamber 4 can be heated, and the electric heating rod can be used for directly heating the dilute antifreeze.

Seventh embodiment

Referring to fig. 7, according to the antifreeze concentrating device 600 according to the sixth embodiment of the present invention, the antifreeze concentrating device 700 according to the seventh embodiment of the present invention is different in that the antifreeze concentrating device 700 for a butt-joint type or closed type heat source tower may not be provided with the cooling heat exchanger 9c.

In this embodiment, the pumping device 8 preferably includes a condensation ejector 81 and an ejector circulation pump 82 connected to each other.

The working principle of the antifreeze concentration device provided by the invention is as follows:

firstly, the invention utilizes the latent heat released by water vapor to dilute the antifreeze, the diluting process is also the process of increasing the volume of the antifreeze, the increased volume can be treated in an overflow mode, and the overflowed dilute antifreeze is concentrated independently;

the heating and the concentration can be carried out simultaneously, and all the antifreeze liquid does not need to be heated in the concentration process, so the heat energy consumed by concentration is very little, the overflowed dilute antifreeze liquid directly enters the heat energy feedback heat exchanger, and the antifreeze liquid solution is distributed into the heat energy feedback heat exchanger in a solution flow regulating valve or frequency conversion mode, so the automatic control is convenient and simplified, and the fault source can be greatly reduced.

The preset control evaporation temperature is also much more accurate, the fluctuation range of the concentration of the antifreeze is also much smaller, the heat energy feedback heat exchanger is not placed in the negative pressure evaporation chamber 4, the heat exchange effect is not ideal because the heat energy feedback heat exchanger is placed in the negative pressure evaporation chamber 4, the heat exchange of the dilute antifreeze corresponding to the circulating water in the circulating mode cannot be realized, the static mode can be very slow in response to the temperature rising speed, and the manufacturing cost of the heat energy feedback heat exchanger can be increased, so the present invention is the first obvious difference between the patent and the related concentrated patent.

Secondly, the related antifreeze concentrate patent does not consider the condition that the dilute antifreeze flows into the negative pressure evaporation chamber 4 or the heat exchanger and air blockage occurs, so an exhaust device is not arranged, and the invention is specially provided with an exhaust electric control valve.

Thirdly, the technology does not consider that the evaporation force of the dilute antifreeze is insufficient under the condition of low ambient temperature, the concentration can be realized by the higher vacuum degree, the energy consumption is huge by the higher vacuum degree, and the concentration work can not be performed when the ultimate vacuum degree of the concentration pumping equipment is reached, so the invention adds the heat energy compensation device in the circulating water tank, and the heat energy compensation device can be an electric heating rod or heat energy from the condenser of the heat pump unit.

Fourth, the prior related patent of the invention for concentrating the antifreeze solution is not provided with a solution heating circulating pump, which can not fully heat the circulating water to continuously heat the dilute antifreeze solution.

Fifthly, the existing relevant antifreeze concentration technology does not consider that too high temperature of circulating water can lead to the failure of sealing of circulating water of the water ring vacuum pump, and can also lead to the failure of vacuumizing of the water injection condensing pump due to too high temperature of the injected circulating water, thereby influencing the effect of concentrating the dilute antifreeze.

Therefore, the invention provides a cooling heat exchanger for spraying circulating water or circulating water, which can be arranged in the circulating water tank or in series with the circulating water tank, and is cooled by adopting antifreeze, and the heat can be fully utilized instead of being dissipated into the air for waste.

The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather utilizing equivalent structural changes made in the present invention description and drawings or directly/indirectly applied to other related technical fields are included in the scope of the present invention.

Claims

1. The antifreeze concentration device for the butt-joint open or closed heat source tower is characterized by comprising an overflow control valve, a heating heat exchanger, a negative pressure evaporation chamber, a liquid outlet control valve, a water vapor pumping device, a heating device, an exhaust control valve and a liquid level monitor, wherein the overflow control valve, the heating heat exchanger, the negative pressure evaporation chamber and the liquid outlet control valve are sequentially connected, and the water vapor pumping device, the heating device, the exhaust control valve and the liquid level monitor are all arranged in the negative pressure evaporation chamber, and the overflow control valve and the liquid outlet control valve are connected with the heat source tower;

when the liquid level monitor detects that the liquid level in the negative pressure evaporation chamber is reduced to a preset third height value, the liquid level monitor controls the liquid outlet control valve to be closed, and the exhaust control valve and the overflow control valve to be opened;

the antifreezing solution concentration device further comprises a first temperature controller, and when the first temperature controller detects that the temperature of the antifreezing solution in the negative pressure evaporation chamber rises to a preset first temperature value, the first temperature controller controls the temperature rising device to be closed;

The temperature rising device is a heating circulating pump and is used for sending the antifreeze in the negative pressure evaporation chamber into the temperature rising heat exchanger again;

the temperature rising device is arranged in the negative pressure evaporation chamber;

the anti-freezing liquid concentration device further comprises a liquid storage tank, and the vapor pumping device is further used for sending the warming liquid flowing out of the warming heat exchanger into the liquid storage tank and sending the warming liquid in the liquid storage tank into the warming heat exchanger again;

the water vapor pumping device comprises a condensation ejector and an injection circulating pump which are connected with each other, the condensation ejector is communicated with the negative pressure evaporation chamber and the liquid storage tank, and the heating heat exchanger is communicated with the injection circulating pump and the liquid storage tank;

the water pumping device is a water ring vacuum pump, the water ring vacuum pump is communicated with the negative pressure evaporation chamber and the liquid storage tank, and the heating heat exchanger is communicated with the water ring vacuum pump and the liquid storage tank;

the antifreeze concentration device also comprises a cooling heat exchanger, wherein the cooling heat exchanger is used for reducing the temperature of the warming liquid flowing out of the liquid storage tank;

the antifreeze concentration device also comprises a heating component, and the heating component is used for increasing the temperature of the warming liquid in the liquid storage tank.