CN101995127A - Device and method for preparing granular ice by injection and atomization - Google Patents

Abstract

The invention relates to a device and method for producing granular ice through injection atomization. The device includes a circulating booster fan (1), a refrigerator evaporator (2), an injection pipe (3), and a water supply tank (4) , particle ice collector (5) and filter (6); Wherein, the outlet of described circulation pressurization fan (1) links to each other with the inlet of refrigerating machine evaporator (2), and the outlet of refrigerating machine evaporator (2) is connected with The inlet end of the ejector pipe (3) is connected, the outlet of the ejector pipe (3) is connected with the inlet end of the particle ice collector (5), and the outlet port of the particle ice collector (5) is connected with the circulation booster fan (1 ), the filter (6) is set inside the particle ice collector (5), the water supply tank (4) is connected to the water inlet of the injection pipe (3), and the water inlet is set at the injection at the smallest section of the pipe (3). The device and method reduce energy consumption in the ice making process.

Description

Device and method for producing granular ice by ejector atomization

technical field

The present invention relates to a new method for producing granular ice through ejection atomization. Small-sized ice particles can be produced by atomizing water in the air and rapidly freezing and freezing, which will greatly increase the interphase between gas and liquid. The heat exchange area further strengthens heat exchange, improves ice-making efficiency, and reduces ice-making energy consumption. The invention belongs to the technical field of ice making.

Background technique

Ice making technology is widely used in many aspects, such as cold storage air conditioning, food freezing, fish preservation and even concrete cooling. At present, ice making is mainly based on making block ice, that is, making water freeze into ice on a low-temperature solid surface. Since the thermal conductivity of ice is two orders of magnitude smaller than that of metal (for example, the thermal conductivity of copper and aluminum at 0°C is 401 W·m-1·K-1 and 236 W·m-1·K-1, respectively, The thermal conductivity of ice is only 2 W·m-1·K-1), so when the ice layer is formed on the solid heat transfer surface during static ice making, a large heat transfer resistance will be generated, and the refrigerant in the tube will evaporate As the temperature decreases, the temperature difference of heat transfer increases, the energy consumption of ice making increases, and the ice making speed also slows down with the increase of ice layer thickness, which will significantly reduce the ice making efficiency of the ice making system.

In order to avoid the above problem of increased thermal resistance caused by the increase of icing thickness, the present invention atomizes the liquid in the gas and freezes it. Since the diameter of the atomized water droplets is very small (below the millimeter level), Therefore, its relative heat transfer area will be greatly increased (if the ice particles with a diameter of 10mm are decomposed into ice particles with a diameter of 0.1mm, the surface area will increase by 100 times), effectively avoiding the static ice production caused by the thickness of ice cubes. The thermal resistance of the ice layer caused by this problem greatly strengthens the heat transfer in the ice making process and reduces the energy consumption of ice making.

Contents of the invention

Technical problem: The object of the present invention is to provide a device and method for producing granular ice through injection atomization, which allows water to be atomized and frozen in the gas, greatly reducing the diameter of frozen particles, and overcoming the problem of liquid in the air. When the solid surface is frozen, the increase of the ice thickness will lead to the increase of the heat conduction resistance of the ice, the decrease of the relative heat exchange area, the decrease of the ice making efficiency, and the increase of the energy consumption.

Technical solution: In order to solve the above technical problems, the technical solution provided by the present invention is a device for producing granular ice through injection atomization. The device includes a circulating booster fan, a refrigerator evaporator, an injection pipe, a water supply tank, and a granular ice collector. and filter: the device includes a circulating booster fan, a refrigerator evaporator, an injection pipe, a feed water tank, a particle ice collector and a filter; wherein, the air outlet of the circulating booster fan is connected to the inlet The air outlet is connected, the air outlet of the evaporator of the refrigerator is connected with the inlet end of the ejector pipe, the outlet of the ejector pipe is connected with the inlet end of the particle ice collector, and the outlet end of the particle ice collector is connected with the inlet port of the circulating booster fan. The ends are connected, the filter is set inside the particle ice collector, the water supply tank is connected to the water inlet of the ejection pipe, and the water inlet is set at the smallest cross-section of the ejection pipe.

The method for producing granular ice of the device for producing granular ice by injecting atomization includes the following steps:

The device for producing granular ice through injection atomization uses circulating cooling medium to exchange heat with the evaporator of the refrigerator to form low-temperature air, and then enters the injection pipe and forms a negative pressure near its smallest cross-section to feed the water tank The water in the air is inhaled and ejected, atomized into water droplets, and the water droplets are quickly frozen into ice particles in the cold air flow, and enter the particle ice collector together with the air flow, where they are separated from the air flow through the filtration of the filter. It is stored in the particle ice collector, and the air flow passes through the circulation booster fan and enters the ice machine evaporator again for the next cycle.

The particle size of the water droplets is 0.5 mm. The circulating cooling medium can be air, nitrogen or other gases.

The gas is used as the cooling medium, and the water is ejected and atomized through the Venturi tube, and the gas exchanges heat with the atomized liquid droplets, and the liquid droplets are frozen into ice particles.

Beneficial effects: the granular ice prepared by the method can be widely used, and can be used in food refrigeration, fish preservation, ice storage and other fields. Due to the large heat transfer area of the method, the required ice-making temperature difference is small, and the thermal efficiency of the system is high, compared with making block ice, the energy consumption of the ice-making process can be greatly reduced.

Compared with the existing method for producing granular ice, the method has simple equipment, low cost, no rotating parts in the whole system, reliable operation, and large-scale ice production can be realized.

Description of drawings

Figure 1 is a flow chart of the ice making cycle. Among them: Circulation booster fan 1, refrigerator evaporator 2, ejector pipe 3, water supply tank 4, particle ice collector 5, filter 6.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

According to the heat transfer theory, increasing the heat transfer temperature difference and reducing the particle size to increase the relative heat transfer area are two ways to increase the heat transfer capacity. Enlarging the temperature difference means increasing the energy consumption, and the present invention adopts the method of atomizing water in the nozzle to realize the production of small particle ice.

Referring to Fig. 1 , the device for preparing granular ice by injecting atomization provided by the present invention includes a circulating booster fan 1, a refrigerator evaporator 2, an ejector pipe 3, a water supply tank 4, a granular ice collector 5 and filter6;

The device for making granular ice by injection atomization includes a circulating booster fan 1, a refrigerator evaporator 2, an ejector pipe 3, a water supply tank 4, a granular ice collector 5, and a filter 6; wherein, the circulating booster The air outlet of the fan 1 is connected to the air inlet of the refrigerating machine evaporator 2, the air outlet of the refrigerating machine evaporator 2 is connected to the inlet end of the ejector pipe 3, and the outlet of the ejector pipe 3 is connected to the inlet end of the particle ice collector 5 connected, the air outlet end of the particle ice collector 5 is connected to the inlet end of the circulating booster fan 1, the filter 6 is arranged inside the particle ice collector 5, the water supply tank 4 is connected to the water inlet of the ejection pipe 3, and the The water inlet is set at the minimum section of the injection pipe 3 .

The present invention also provides a method for producing granular ice by injecting atomization, the method comprising the following steps:

The device for producing granular ice through ejection atomization uses the cold-carrying medium to exchange heat with the evaporator 2 of the refrigerator to form low-temperature air, which then enters the ejector pipe 3 and forms a negative pressure near its smallest cross-section, which will give The water in the water tank 4 is sucked and ejected, atomized into water droplets, and the water droplets are quickly frozen into ice particles in the cold air flow, and enter the particle ice collector 5 together with the air flow, and pass through the filtration of the filter 6 in the particle ice collector Separated from the air flow, it is stored in the particle ice collector 5, and the air flow passes through the circulation booster fan 1 and enters the ice machine evaporator 5 again for the next cycle.

The particle size of the water droplets is 0.5mm.

The circulating cooling medium can be air, nitrogen or other gases.

The gas is used as the cooling medium, and the water is ejected and atomized through the Venturi tube, and the gas exchanges heat with the atomized liquid droplets, and the liquid droplets are frozen into ice particles.

The specific process is as follows: the water supply tank 4 is connected to the smallest section of the nozzle, and the system uses air as the circulating medium. The low-temperature and low-pressure air from the heat exchanger 5 is boosted by the pressurized circulation fan 1, then enters the nozzle 2 and forms a negative pressure at the smallest cross-section, sucks the water at normal temperature in the water supply tank 4, and atomizes it , so that the water droplets freeze rapidly in the cold air flow, and these ice particles are blown into the freezing container 3 . During this process, the temperature of the gas flow increases and the pressure decreases. The high-temperature and low-pressure air flows into the heat exchanger 5) to be cooled, and then is sucked into the circulation fan to enter the next cycle.

This method reduces the diameter of water droplets through atomization, which greatly increases its relative heat transfer surface area. This method obtains water droplets with extremely small particle sizes through ejection atomization, thereby greatly increasing the heat transfer surface area between the gas-liquid two phases. The heat transfer is greatly enhanced, the temperature difference of heat transfer is reduced, and the purpose of energy saving is achieved. Granular ice is produced by this method, there are no moving parts in the system, the equipment cost is low, the operation is reliable, and large-scale ice production can be realized.

Claims (3)

1. produce the device of particle ice by injection atomizing for one kind, it is characterized in that: this device comprises circularly-supercharged blower fan (1), evaporator of refrigerator (2), induction tunnel (3), feed-tank (4), particle ice gatherer (5) and filter (6); Wherein, the air outlet of described circularly-supercharged blower fan (1) links to each other with the air inlet of evaporator of refrigerator (2), the air outlet of evaporator of refrigerator (2) links to each other with the inlet end of induction tunnel (3), the outlet of induction tunnel (3) links to each other with the inlet side of particle ice gatherer (5), the outlet side of particle ice gatherer (5) links to each other with the inlet end of circularly-supercharged blower fan (1), filter (6) is arranged on particle ice gatherer (5) inside, feed-tank (4) is connected the water inlet of induction tunnel (3), and this water inlet is arranged on the smallest cross-sectional place of induction tunnel (3).

2. as claimed in claim 1ly produce the method for producing particle ice of the device of particle ice by injection atomizing for one kind, it is characterized in that: this method comprises the steps:

The described device of producing particle ice by the injection atomizing carries cold medium with circulation and evaporator of refrigerator (2) carries out the heat exchange cooling, form Cryogenic air, then enter induction tunnel (3) and near its smallest cross-sectional, form negative pressure, water in the feed-tank (4) is sucked and injection, it is atomized into small water droplet, carry out heat exchange by the water droplet after gas and the atomizing, and the water droplet quick freezing is become small ice particle; Enter particle ice gatherer (5) with air-flow, in particle ice gatherer, pass through the filtration and the flow separation of filter (6), be stored in particle ice gatherer (5), air communication is crossed circularly-supercharged blower fan (1) and is entered ice machine evaporator (5) once more and carry out next circulation.

3. according to claim 2 the atomizing by injection produced the method for particle ice, and it is characterized in that: it is air or nitrogen that a cold medium is carried in circulation.

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