JPH052366B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon dioxide absorption device used for absorbing carbon dioxide into a product liquid in the process of producing a carbonated soft drink.

FIG. 1 and FIG. 2 are sectional views showing the configuration of a conventional carbon dioxide absorption device, respectively.

The one shown in Figure 1 is designed to absorb carbon dioxide gas while cooling the product liquid.
A is a tank, b is a heat insulating material, and a pressurized carbon dioxide atmosphere is created in the tank a by an automatic carbon dioxide gas supply control valve c and an automatic tank internal pressure controller j that is interlocked with the automatic carbon dioxide gas supply control valve c.

e is an inlet for the product liquid, and the product liquid that has flowed in is distributed evenly to the carbonation plate g in the water distribution tank f.
From the liquefied refrigerant inlet h to the carbonation plate g,
A refrigerator (not shown) is connected so that a refrigerant such as ammonia or chlorofluorocarbon is supplied and discharged from a vaporized refrigerant outlet i through a refrigerant flow path in the carbonation plate g.

The product liquid distributed to the carbonation plate g is
It is cooled by vaporizing the liquefied refrigerant and absorbs carbon dioxide in a pressurized carbon dioxide atmosphere. In addition, d
is a tank pressure gauge, and j is an automatic tank pressure regulator, which detects the pressure inside the tank a and operates the carbon dioxide gas supply automatic control valve c to maintain the pressure inside the tank at a predetermined pressure.

The product liquid that has been cooled and absorbed carbon dioxide gas by the carbonation plate g is stored at the bottom of the tank and is sent out from the product liquid outlet l. Note that k is a swirl prevention plate, and m is a product liquid temperature detector.

Moreover, the one shown in FIG. 2 is one in which carbon dioxide gas is absorbed after the product liquid has been cooled in advance.

I is a heat exchanger, and a suitable refrigerant (chilled water or propylene glycol aqueous solution, etc.) is supplied from the refrigerant supply port K.
supply. H is cooled to a predetermined temperature in a heat exchanger I at the product liquid supply port. L is the refrigerant outlet,
The refrigerant is directed back to the cooling system. J is the check valve, E is the inlet of the cooled product liquid to the tank, and E is the cooled product liquid supplied from the product liquid inlet, which is almost evenly distributed to the carbonation plate G by the water distribution nozzle F. .

In addition, A is a tank, B is a heat insulating material, and D is an automatic tank pressure regulator that detects the pressure inside tank A and operates the automatic carbon dioxide gas supply valve C to maintain the carbon dioxide pressure in tank A to a predetermined pressure. I'm learning to keep it. The product liquid distributed to the carbonation plate G absorbs carbon dioxide gas under a pressurized carbon dioxide atmosphere, flows down to the bottom of the tank, and is stored. P is a swirl prevention plate, M is a product liquid temperature detector, and N is a product liquid outlet.

In both of the apparatuses shown in FIGS. 1 and 2, the flow rate of the liquid sent to the next process from the L or N product liquid outlet is not necessarily constant. Therefore, depending on the operating conditions,
The amount of product liquid stored in tank a or A changes depending on the liquid feeding state.

Due to the structure of the conventional products described above, the carbon dioxide absorption efficiency (the ratio of the actual carbon dioxide absorption value to the saturation value determined from the product liquid temperature and tank internal pressure) is approximately the same. (1) When the product liquid delivery to the next process is stopped, more carbon dioxide gas is absorbed from the gas-liquid interface of the product liquid stored in the tank, and the carbon dioxide gas There is a large change in absorption concentration.

(2) At the start of operation when the tank is empty, a large amount of carbon dioxide gas is absorbed due to free fall from the lower end of the carbonation plate, and the carbon dioxide absorption of the product changes depending on the change in the storage liquid level position. .

(3) When the temperature of the product liquid increases, the pressure inside the tank becomes higher than necessary, which interferes with the next process of filling the product liquid. (Conventionally, it is cooled to 1 to 2 degrees Celsius) The present invention was proposed in view of the above points,
In a carbon dioxide absorption device that supplies a product liquid into a carbon dioxide atmosphere at a predetermined pressure and absorbs carbon dioxide gas,
An orifice is provided in the supply piping that leads the product into the tank, an injection nozzle is installed slightly downstream of the orifice, and a carbon dioxide gas injection device is provided for injecting carbon dioxide into the product liquid through the injection nozzle. , and is configured such that carbon dioxide gas at a predetermined flow rate and pressure is supplied to the carbon dioxide gas injection device via a flow meter and a pressure gauge, and its purpose and From the perspective of energy saving, it is possible to absorb carbon dioxide even at a product liquid temperature close to room temperature, and to perform the specified amount of carbon dioxide absorption at a relatively low tank internal pressure. An object of the present invention is to provide a carbon dioxide absorbing device which can reduce changes in absorption amount and enable stable operation even under poor conditions at a product liquid temperature close to room temperature.

The present invention will be explained below based on one embodiment.

FIG. 3 is an overall configuration diagram of the carbon dioxide absorption device.

1 is a product liquid supply pipe, and 2 is a carbon dioxide gas injection device. Carbon dioxide gas is supplied to the carbon dioxide gas injection device 2 via a carbon dioxide gas supply valve 3, a pressure reducing valve 4, a carbon dioxide gas flow meter 5, a carbon dioxide gas flow abnormality alarm 6, a pressure gauge 7, and a carbon dioxide gas flow control valve 8. It is becoming more and more like this. 9 is a heat exchanger, 10 is a refrigerant supply port, 11 is a refrigerant outlet, 12 is a check valve, 13 is a product liquid supply port to the carbon dioxide absorption tank, 14 is a liquid distribution nozzle, 1
5 is carbonation liquid, 16 is carbon dioxide gas supply automatic control valve, 17 is tank internal pressure automatic regulator, 18
is a tank, 19 is a heat insulator, 20 is a swirl prevention plate, 2
1 is a product liquid temperature detector, 22 is a product liquid outlet, 23
is the tank pressure gauge.

In the above, except for the carbon dioxide gas injection device 2, the structure is the same as that of the conventional device shown in FIG. FIG. 4 is a detailed view of the carbon dioxide injection device 2, in which 101 is the valve body, 102 is the cylinder, 103 is the piston, 104 is the spring, 105 is the cylinder lid, 10
6 is a valve stem, 107 is a valve seat, 108 is a washer, 109 is a cheese, 110 is a gasket, 11
1, 112, 113 are rolling seals, 114, 115 are bolts, 116, 117
is a spring washer, 118 is a valve stem fixing nut, 1
19 is a product liquid supply port, 120 is an orifice plate,
121 is a carbon dioxide gas injection nozzle, 122 is a product liquid outlet, 123 is an air inlet for valve operation, 124 is a supply port for injected carbon dioxide gas, 125 is a nut, 126 is a packing, 127 is a connecting pipe, and air inlet 1
23, by supplying air to raise the piston 103 against the spring 104 and raising the valve seat 107, carbon dioxide supplied from the carbon dioxide gas supply port 124 is passed through the injection nozzle 121. Configured to be injected into the product liquid.

Next, the effect will be explained.

A predetermined flow rate of the product liquid is supplied from the product liquid supply pipe 1, while carbon dioxide gas is supplied at sufficient pressure from the carbon dioxide gas supply valve 3, and the pressure is adjusted to a predetermined pressure using the pressure reducing valve 4. This pressure is confirmed with the pressure gauge 7. The opening degree of the carbon dioxide gas flow control valve 8 is measured by the carbon dioxide flow meter 5.
Check and set the required flow rate. The carbon dioxide gas flow rate abnormality alarm device 6 is configured to issue an alarm when the set carbon dioxide gas flow rate becomes abnormal (too much or too little).

The carbon dioxide gas injection device 2 has a product liquid supply port 119.
The carbon dioxide gas set at the required flow rate described above is injected into the product liquid at a predetermined flow rate supplied from the orifice plate 1.
20, the flow is sufficiently turbulent, and the carbon dioxide gas injection device 2 injects carbon dioxide gas only when the product liquid is flowing at an appropriate timing with the flow of the product liquid.

The carbon dioxide gas is injected through the carbon dioxide supply port 124 in a quantity measured by the carbon dioxide gas flow meter 5 . For this supply, operating air is supplied from the valve operating air inlet 123, and the piston 103 and the valve stem 106
This is done by driving the valve seat 107 upward, and carbon dioxide gas is injected from the carbon dioxide gas injection nozzle 121 into the sufficiently turbulent flow of the product liquid. The tip of the carbon dioxide gas injection nozzle 121 protrudes slightly downstream from the orifice plate 120, and is positioned at the location where the flow velocity of the product liquid is maximum, so that the injected carbon dioxide gas is not affected by the turbulence of the product liquid. As a result, microbubbles form, expanding the gas-liquid contact area with the product liquid, and at the same time, there is sufficient turbulence on the product liquid side, so carbon dioxide gas is efficiently absorbed.

The product liquid into which the necessary carbon dioxide gas has been injected by the carbon dioxide gas injection device 2 is cooled or controlled to the required temperature by the heat exchanger 9, passes through the check valve 12, and then
The product liquid is fed under pressure to the product liquid supply port 13 to the carbon dioxide absorption tank 18.

The tank 18 is for absorbing carbon dioxide gas, and distributes the liquid almost uniformly to the carbonation plate 15 using the liquid distribution nozzle 14, and at the same time performs the necessary carbon dioxide gas absorption as well as the above-mentioned carbon dioxide injection. The trace amount of dissolved air that is separated from the product liquid during carbon dioxide absorption in the device 2 is exposed to a pressurized carbon dioxide atmosphere by turning the product liquid into a thin falling liquid film with a carbonation plate 15. Perform separation.

By injecting and absorbing carbon dioxide gas with the carbon dioxide gas injection device 2 as described above, the carbon dioxide absorption efficiency of the entire device increases, and furthermore, in the tank 18, the carbon dioxide gas necessary for the final product is By homogenizing the absorbed carbon dioxide gas and separating trace amounts of dissolved air while absorbing it, stable carbonated soft drinks can be produced.

Further, the carbon dioxide gas injection device 2 has a simple structure and can absorb most of the carbon dioxide gas injected.

Furthermore, the carbon dioxide injection device 2 is a combination of a carbon dioxide gas injection nozzle and an orifice, and the nozzle tip is located slightly downstream of the orifice, so that the pressure loss of the product liquid at the orifice is reduced and the injected carbon dioxide is Since gas can be made into sufficiently fine bubbles, carbon dioxide gas can be easily absorbed.

In conventional carbon dioxide absorption devices, the carbon dioxide absorption efficiency is fixed depending on the type of product liquid, liquid temperature, and structure of the device. By using this method, the carbon dioxide absorption efficiency of the entire device can be adjusted by changing the amount of carbon dioxide gas injected.

The carbon dioxide absorption efficiency referred to here is as follows.

η=GV/P×H×100 However, η: Carbon dioxide absorption efficiency [%] GV: Amount of carbon dioxide absorbed by the product [NlCO ₂ /l
Liquid] P: Tank internal pressure [atm] H: Carbon dioxide solubility [NlCO ₂ /l liquid, atm] Also, when carbon dioxide gas is absorbed at a product liquid temperature close to room temperature, the tank pressure with conventional products is quite high. In contrast, in this embodiment, the pressure inside the tank can be adjusted by injecting the necessary carbon dioxide with the carbon dioxide gas injection device 2, and the saturation pressure can be adjusted according to the amount of carbon dioxide in the product liquid. The tank internal pressure can be obtained by adding the excess pressure necessary to pump the product liquid to the next process.

Furthermore, as mentioned above, the carbon dioxide absorption efficiency can be increased, so even if the product liquid stored in the tank remains for a relatively long time without being sent to the next process, the carbon dioxide gas absorption of the product liquid can be improved. It is possible to produce a homogeneous product liquid with little variation in quantity. It has many effects.

[Brief explanation of drawings]

1 and 2 are configuration diagrams showing different conventional examples, FIG. 3 is a configuration diagram showing an embodiment of the present invention, and FIG. 4 is a detailed sectional view of the main parts. 1: Product liquid supply piping, 2: Carbon dioxide gas injection device,
16: Carbon dioxide gas supply automatic control valve, 18: Tank,
120: Orifice plate, 121: Injection nozzle.

Claims (1)

[Claims] 1 In a carbon dioxide absorption device that supplies a product liquid to a carbon dioxide atmosphere at a predetermined pressure and absorbs carbon dioxide gas, an orifice is provided in the supply piping that leads the product liquid into a tank, and the product is injected slightly downstream of the orifice. The device is equipped with a carbon dioxide gas injection device that injects carbon dioxide gas into the product liquid through the injection nozzle, and a predetermined flow rate and predetermined pressure are supplied to the carbon dioxide gas injection device via a flow meter and a pressure gauge. A carbon dioxide absorption device characterized in that it is configured to supply carbon dioxide gas.