JPH01185395A - Apparatus for producing air-mixed liquefied gas - Google Patents

Abstract

PURPOSE:To readily obtain an air-mixed liquefied gas exhibiting a stable quantity of heat, by mixing a gas obtd. by evaporating a liquefied gas with a cooling medium for air dehumidification, followed by complete gasification, with an air dehumidified with the aforesaid cooling medium. CONSTITUTION:An apparatus comprising a liquefied gas storage tank (1), an evaporator in which a low-temp. liquefied gas fed from the storage tank (1) and having a pressure reduced by means of a liq. pressure regulating valve (3) is evaporated by heat exchange with a cooling medium, an air dehumidifier (18) in which a cooling pipe (17) through which the cooling medium cooled by means of the evaporator (4) is circulated is inserted and air (introduced through an opening 16) is cooled to be dehumidified, and a mixer (13) in which the liquefied gas (12) fed from the evaporator (4) and passed through a vaporizer (7) (e.g., vaporizing with hot water supplied from a hot water producer 8) and a gas pressure regulating valve (11) is mixed with the air fed from the air dehumidifier (18) and having a regulated pressure (21).

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is a method for mixing air with liquefied petroleum gas or liquefied natural gas such as butane or propane, and supplying the mixture as fuel or industrial raw material gas. The present invention relates to a configuration for pressure regulation and dehumidification of air mixed with liquefied gas, and dehumidification of mixed gas in an air-mixed liquefied gas manufacturing apparatus.

(Prior art) Conventional air-mixed liquefied gas production equipment includes methods in which liquefied gas and air are pressurized separately and mixed in a mixer, or a mixer with one ejector is used to naturally convert the atmosphere into air using the pressure of liquefied gas. A suction method was used.

Further, at this time, a method has been adopted in which the calorific value of the mixed gas is adjusted by proportionally controlling the respective flow rates of liquefied gas and air.

(Problem to be solved by the invention) In the conventional air-mixed liquefied gas production apparatus as described above,
Because the atmosphere was used with or without pressurization,
There was a problem in that the density of the air fluctuated due to fluctuations in the temperature, humidity, and atmospheric pressure of the air, making it impossible to determine the amount of heat in the gas produced.

There is also a method of controlling the amount of heat using a calorific value detected by a calorific value measuring device for air-mixed liquefied gas, but this causes a delay in control time and causes the amount of heat during this time to become unstable.

In view of the above-mentioned problems, the purpose of the present invention is to adjust the temperature, humidity, and pressure of air mixed with air-mixed liquefied gas before mixing, and to supply air-mixed liquefied gas with a stable calorific value by mixing this with the liquefied gas. Furthermore, it is an object of the present invention to provide an apparatus for producing an air-mixed liquefied gas that can easily dehumidify the air-mixed liquefied gas. - [Structure of the invention] (Means for solving the problem) In order to achieve the above object, the air-mixed liquefied gas production apparatus of the present invention includes a liquefied gas storage tank and a liquefied gas derived from the storage tank. In the evaporator where the refrigerant is evaporated, a cooling pipe is inserted through which the refrigerant cooled by the evaporator circulates, and an air dehumidifier is inserted to cool and dehumidify the air. It consists of a mixer in which pressure-regulated liquefied gas is mixed with air that has been dehumidified by the air dehumidifier and whose pressure has been further adjusted.

Further, in the air-mixed liquefied gas production apparatus of the present invention, the liquefied gas led out from the liquefied gas storage tank is evaporated into first and second evaporators, and the refrigerant cooled by the second evaporator is circulated. an air dehumidifier into which an air cooling pipe is inserted to cool and dehumidify the air; a liquefied gas led out from the second evaporator and passing through a vaporizer and a gas pressure regulating valve on the way; a mixer in which air whose pressure has been adjusted in
[It consists of a mixed gas cooling and dehumidifying device that cools and dehumidifies the mixed gas, and a refrigerant circulation path that circulates the refrigerant cooled by the first evaporator through the mixed gas cooling and dehumidifying device.

(Function) The liquefied gas led out from the liquefied gas storage tank is depressurized by the liquid pressure regulating valve and introduced into the evaporator, where it is heated by the refrigerant that exchanged heat with air and evaporates. The air is also introduced into an air dehumidifier in which refrigerant cooled by an evaporator circulates and is dehumidified. The liquefied gas led out from the evaporator is sent to the mixer via the vaporizer and the gas pressure regulating valve. In addition, after the pressure of the dehumidified air drawn out from the dehumidifier is adjusted,
It is sucked into a mixer and mixed with liquefied gas.

Furthermore, when the liquefied gas is evaporated in the first and second evaporators, the refrigerant for air cooling is cooled in the second evaporator, and the refrigerant is cooled in the first evaporator.
The refrigerant for mixed gas cooling is cooled in the evaporator.

<Example) Example 1 An embodiment of the present invention will be described with reference to FIG.

Reference numeral 1 denotes a liquefied gas storage tank, and a liquid outlet pipe 2 led out from the bottom of the storage tank 1 is communicated with an evaporation pipe 5 inserted into an evaporator 4 via a liquid pressure regulating valve 3 in the middle.

Further, the gas-liquid mixing pipe 6 connected to the evaporation pipe 5 is connected to a vaporizer 7.
The vaporizer 7 is connected to a hot water generator 8 and a hot water pump 9.
In addition, from the vaporizer 7, a vaporized gas pipe 1 having a gas pressure regulating valve 11 in the middle is inserted.
2 is led out, and this vaporized gas pipe 12 is connected to an ejector type mixer 13.

A refrigerant circulation pipe 15 having a refrigerant pump 14 in the middle is connected to the evaporator 4, and the refrigerant circulation pipe 15 is inserted into an air dehumidifier 18 into which air is introduced through an opening 16 at one end. It is connected to 17.

Further, a dehumidifier trachea 19 led out from the air dehumidifier 18 is communicated with the suction port 22 of the ejector type mixer 13 via a feed rate 20 and a flow rate regulating valve 21 on the way.

Further, the air mixed gas 23 led out from the discharge side of the mixer 13 is communicated with a gas holder 25, and the mixed gas pipe 26 led out from the gas holder 25 has a flow rate measuring device 27. It is communicated.

Further, a gas supply pipe 30 is led out from the mixed gas storage tank 29.

Next, the operation of the first embodiment described above will be explained.

The liquid in the liquefied gas storage tank 1 is 121.1°C (outside temperature 2
Commercially available liquefied mixed butane (butane 70 mol%, propane 30 mol%) with a saturation pressure of 3.7 Kg/cut (1.1℃) and a saturation pressure of 3.7 Kg/cut.
is stored. This liquid is led out through the liquid outlet pipe 2, and the liquid temperature is -6.7°C and the saturation pressure is 1-OKfl/
cti and introduced into the evaporation tube 5 of the evaporator 4.

Here, it is heated and partially vaporized by the OoC refrigerant (brine) that exchanges heat with the atmosphere, and the liquefied mixed butane is sent to the vaporizer 7 through the gas-liquid mixing pipe 6, where it exchanges heat with an external heat source such as hot water. The mixture becomes a completely vaporized butane gas.

This mixed butane gas is adjusted to 0.7' by the gas pressure regulating valve 11.
The pressure is adjusted to j/a/r and sent to the mixer 13.

In addition, the refrigerant that has exchanged heat with the liquefied gas at -6.7°C in the evaporator 4 becomes -3°C and is transferred to the dehumidifier 18 by the refrigerant pump 14.
21 which is sent to the cooling pipe 17 inside and sucked into the dehumidifier 18.
．． The air at 1°C and 75% humidity is cooled and dehumidified to prevent dew droplets from adhering to the cooling pipe 17, becoming saturated air at a temperature of 5°C, which is then taken into the blower 20 through the dehumidifying air pipe 19 and the flow rate regulating valve 21. The flow rate is adjusted at 450 saQ, and the mixture is fed into the mixer 13 at a pressure of 450 saQ.

The liquefied gas and air sent into the mixer 13 as described above are mixed there and sent to the gas holder 25 through the mixed gas pipe 23 and stored therein. Furthermore, when the pressure of the mixed gas storage tank 29 decreases due to use, the mixed gas is pumped from the gas holder 25 to the storage tank 29 via the mixed gas pipe 26 and the compressor 28 pressurizes it to 2 K'j/cM to 3 K9/cm. Send it in.

If the pressure of the liquefied gas in the liquefied gas storage tank 1 is high, for example, use commercially available liquefied propane (propane 90 mol%, butane 10 mol%) at a liquid temperature of 16°C and a saturation pressure of 6.7'J.
/ When cri, the gas pressure is adjusted to 2 with the gas pressure regulating valve 11.
．． If OK'J/CIA is set and air is sucked by the ejector action of the mixer 13, the blower 20 becomes unnecessary.

Example 2 Another embodiment of the present invention will be described with reference to FIG.

A stirring type mixer 13 is connected to the gas pressure regulating valve 11 via a gas flow regulating valve 31, and a pressurized air pipe 34 from an air tank 33 connected to a compressor 32 is introduced into the air dehumidifier 18 in a closed type. has been done.

Furthermore, a dehumidifying air pipe 19 led out from the air dehumidifier 18
is connected to the mixer 13 via an air pressure regulating valve 35 and an air flow regulating valve 36 on the way. The other configurations are the same as in the first embodiment.

Next, the operation of the second embodiment will be explained.

The liquid temperature in the liquefied gas storage tank 1 is 16°C (the outside temperature is 16°C).
°C) Commercially available liquefied propane (90 mol% propane, 10 mol% butane) with a saturation pressure of 6,7 Ky/cd is stored. This liquid is 3.0Kg /
The pressure is reduced to ctA, partially evaporated in the evaporator 4, completely vaporized by exchanging heat with an external heat source such as steam or hot water in the vaporizer 7, and the pressure is adjusted to 2 kg/ci by the gas pressure regulating valve 11. The flow rate is adjusted by the flow rate adjustment valve 31 and sent to the mixer 13. In addition, the air at 16°C is compressed by the compressor 32 to become 6 K9/ci and is sent to the air tank 33.
is stored in. Next, during use, the air drawn out from the air tank 33 is cooled and dehumidified by exchanging heat with the -2°C refrigerant (brine) sent from the evaporator 4 in the air dehumidifier 18 to become saturated air with a temperature of 5°C. In the dehumidified air pipe 19, the pressure is adjusted to 2.0 Kg/cM by the pressure adjustment valve 35, and the air is sent to the mixer 13 together with the liquefied gas at the same pressure via the flow rate adjustment valve 36, where it is mixed.

In addition, the 0°C refrigerant that has undergone heat exchange in the dehumidifier 18 exchanges heat with the liquefied gas at -5°C in the evaporator 4 and becomes -2°C, and is then transferred to the air dehumidifier 1.
It is returned to the cooling pipe 17 of No. 8 and circulated.

Other functions are the same as in Example 1, but the feature of Example 2 is that since air is cooled under high pressure, temperature and humidity are stabilized, and the dehumidification effect is improved.

Example 3 Still another embodiment of the present invention will be described with reference to FIG.

A liquid outlet pipe 2 led out from the liquefied gas storage tank 1 is connected to an evaporator pipe 38 inserted into a first evaporator 37 via a liquid pressure regulating valve 3, and this evaporator pipe 38 is further connected to a second evaporator 4. A gas-liquid mixing tube 6 connected to the evaporation tube 5 is connected to the vaporizer 7 . Further, the second evaporator 4 is connected to a refrigerant circulation pipe 15 in which a cooling pipe 17 is inserted into an air dehumidifier 18 .

39 is a mixed gas cooling and dehumidifying device, and the 10th mature exchanger 4
0, a second heat exchanger 41, a water droplet removal plate 42, and a mixed gas dehumidifier 44 equipped with a drain reservoir 43 at the bottom. The first heat exchanger 40 includes the first
A cooling pipe section 47 of a refrigerant circulation path 46 led out from the evaporator 37 and having a refrigerant circulation pump 45 in the middle thereof is inserted. Furthermore, a pressurized mixed gas pipe 48 led out from the mixed gas compressor 28 is introduced into the second heat exchanger 41,
Primary cooling mixed gas pipe 4 led out from the second heat exchanger 41
9 is introduced into the first heat exchanger 40, and the first heat exchanger 4
The secondary cooling mixed gas pipe 50 led out from the mixed gas dehumidifier 44 is introduced into the mixed gas dehumidifier 44, and the dehumidifying mixed gas pipe 51 led out from the mixed gas dehumidifier 44 connects the intermediate heat exchange section 52 to the second heat exchanger. After being inserted into the container 41, it is communicated with the mixed gas storage tank 29.

Note that other configurations such as air cooling, dehumidification, vaporization of liquefied gas, and mixing of air and liquefied gas are the same as in the first embodiment.

Next, the operation of the third embodiment will be explained.

The liquefied gas storage tank 1 has a liquid temperature of 21°C (outside air temperature 2).
Commercial liquefied mixed butane (70 mol% butane, 30 mol% propane) at saturation pressure 3,7'l/cM) (1 °C), saturation pressure 3,7'l/cM
is stored. The liquid temperature is -6 at the liquid pressure regulating valve 3.
, 7°C, the saturation pressure was reduced to 1.0 Kg/cta, and the first
The gas is introduced into the vaporizer 7 through the second evaporator 37 and the second evaporator 4, where it is completely vaporized and reduced to 0.7 by the gas pressure regulating valve 11.
The pressure is adjusted to c#i and sent to the mixer 13. In addition, in the air dehumidifier 18, the air at 21°C is heated to the cooling pipe 17 at 13°C.
It is cooled and dehumidified by the blower 20 and the flow rate adjustment valve 21.
The pressure is adjusted to mmaq, the mixture gas is sucked into the mixer 13 and mixed with the liquefied gas, and the mixed gas is transferred to the gas holder 25 at 300 mmaq.
It is stored in maq. The mixed gas led out from the gas holder 25 is converted to 4 kg/ci by the mixed gas compressor 28.
The pressure is increased to 30°C, and the mixture is introduced into the second heat exchanger 41 of the mixed gas cooling and dehumidifier @ 39 for primary cooling, and is further cooled secondarily in the first heat exchanger 40, and then introduced into the mixed gas dehumidifier 44. The dehumidified mixed gas led out from the dehumidifier 44 is heated in the heat exchange tube section 52 of the second heat exchanger 41, and is heated to 15° C. and a mixed gas of 3.5 kg/cr4. The mixed gas is stored in the mixed gas storage tank 29.

In addition, a -3°C refrigerant (brine) that has undergone heat exchange with the -6.7°C liquefied gas in the first evaporator 37 is introduced into the cooling pipe section 47 of the first heat exchanger 40 and exchanges heat with the mixed gas. The temperature reaches 0° C. and returns to the first evaporator 37 for circulation.

According to the third embodiment, since the air before mixing is dehumidified and the pressurized mixed gas is also dehumidified, the dehumidification effect is greater than when the air before mixing is cooled under the same conditions.

〔Effect of the invention〕

According to the present invention, since the refrigerant that circulates through the dehumidifier that cools and dehumidifies air by using the evaporator that evaporates the liquefied gas, there is no need for a refrigerant cooling device for cooling the air, and the amount of heat of the mixed gas can be reduced. It eliminates the need for complicated steps such as measuring and fine-tuning the air flow rate, and also reduces the temperature of the air to 0°C.
When changing from (winter) to 30℃ (summer), the influence of atmospheric density on the calorific value of the mixed gas is approximately 10% in the case of butane-air mixed gas 7000 Kcal/NH3, but
By keeping the air temperature at about 5° C. with a dehumidifier, the effect on the amount of heat of the mixed gas can be reduced to 0.4%. Furthermore, when mixing air with a temperature of 30°C and humidity of 90%, and when inhaling a fixed amount of air with a humidity of 5°C and a humidity of 95% through dehumidification, it is possible to prevent fluctuations in the amount of heat by approximately 10%. It is possible to reduce the influence of fluctuation factors such as drought and humidity on the amount of heat, and it is possible to obtain a stable amount of heat.

Also, since the mixed gas cooling and dehumidifying device that cools and dehumidifies liquefied gas in an empty air platform circulates the refrigerant cooled by the liquefied gas evaporator, there is no need for a dedicated cooling device for the mixed gas cooling and dehumidifying device, and it can be used in a pressurized state. Since the mixed gas is cooled, the cooling and dehumidifying effect can be enhanced. Furthermore, the heat source of the liquefied gas evaporator is the heat of the air and the mixed gas, which reduces the amount of heat required to vaporize the liquefied gas. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of an air-mixed liquefied gas production apparatus showing one embodiment of the present invention, and FIGS. 2 and 3 are flow sheets showing other embodiments of the same. 1. Liquefied gas storage tank, 3. Liquid pressure adjustment valve, 4.
37... Evaporator, 7... Vaporizer, 13... Mixer, 17
...Cooling pipe, 18..Air dehumidifier, 39..Mixed gas cooling and dehumidification device, 46..Refrigerant circulation path. January 18, 1986

Claims (2)

[Claims] (1) A liquefied gas storage tank, an evaporator in which the low-temperature liquefied gas led out from this storage tank and reduced in pressure by a liquid pressure regulating valve exchanges heat with a refrigerant and evaporates, and the refrigerant cooled by this evaporator circulates. an air dehumidifier into which a cooling pipe is inserted to cool and dehumidify air; liquefied gas led out from the evaporator and passed through a vaporizer and a gas pressure regulating valve on the way; and air led out from the air dehumidifier and whose pressure is adjusted. An apparatus for producing air-mixed liquefied gas, comprising: a mixer in which air-mixed liquefied gas is mixed; (2) A liquefied gas storage tank, first and second evaporators that evaporate the low-temperature liquefied gas led out from this storage tank and reduced in pressure by a liquid pressure regulating valve, and a refrigerant cooled by this second evaporator. an air dehumidifier into which an air cooling pipe is inserted to cool and dehumidify the air; a liquefied gas led out from the second evaporator and passed through a vaporizer and a gas pressure regulating valve on the way; and a liquefied gas led out from the air dehumidifier. a mixer in which air is mixed with air whose pressure has been adjusted midway; a mixed gas cooling and dehumidifying device that cools and dehumidifies the pressurized mixed gas derived from the mixer; and a refrigerant cooled by the first evaporator. An apparatus for producing an air-mixed liquefied gas, characterized in that the air-mixed liquefied gas production apparatus comprises a refrigerant circulation path for circulating the air-mixed liquefied gas through the mixed gas cooling and dehumidifying device.