JPH04131596A - Hot air-hot water combined type carburetor device - Google Patents

Abstract

PURPOSE:To enable the change-over operation switched to hot air and hot water so as to allow liquefied petroleum gas to be vaporized desirably even in a cold district or in the coldest period by forming a supply side manifold into double pipe structure of a liquefied petroleum gas pipe and a jacket pipe, and supplying the liquefied petroleum gas and hot water separately to these pipes. CONSTITUTION:There are provided a supply side manifold 2 and an exhaust side manifold 4, and numerous heat transfer tubes 6 are connected between both manifolds 2, 4. The supply side manifold 2 is to be of double pipe structure formed of a liquefied petroleum gas pipe 21. (hereinafter referred to as 'LPG pipe') communicated with each heat transfer tube 6, and a jacket pipe 22 disposed in such a way as to surround the outside of the LPG pipe 21. The LPG fed into the LPG pipe 21 flows inside the heat transfer tubes 6. The outer jacket pipe 22 is connected to a hot water storage tank 31, and the hot water from the hot water tank 31 flows inside the jacket pipe 22 toward an outlet 26 while exchanging heat with LPG running in the LPG pipe 21. The operation can be thereby switched according to the climate condition, and the carburetion of LPG can be performed desirably even in a cold district or in the coldest period.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention relates to a vaporizer for vaporizing liquefied petroleum gas (LPG) such as liquefied propane gas and liquefied butane gas, and in particular can be used in cold regions or severe winters. It is related to a vaporizer that can be used for both air temperature and hot water.
It can be suitably used to produce propane air gas or butane air gas from liquefied propane gas or liquefied butane gas, respectively.

Dish J and l1 As disclosed in Japanese Unexamined Patent Publication No. 180099/1989, the applicant vaporized liquefied propane gas in an air-temperature forced vaporizer and mixed it with air to produce 13A propane air. He proposed a plant to produce gas.

The air-heated forced vaporizer used in this 13A propane air gas manufacturing plant has a heat exchanger made of aluminum finned heat transfer tubes that have high heat transfer efficiency similar to that of liquid oxygen or liquid nitrogen. Heat transfer coefficient: 25.3k
g/rrl'-hr/'c), while the liquefied propane gas flowing into the vaporizer is reduced in pressure at the liquid inlet of the vaporizer to lower the boiling point of the liquefied propane gas, That is, in the case of IKg/c I.G, the temperature is set at about -27°C, creating a temperature difference from the atmospheric temperature, and the structure is such that gasification is performed using a finned heat transfer tube.

In this way, the air-heated forced vaporizer uses the atmospheric temperature as a heat source and has a structure in which the liquefied propane gas is evaporated by the temperature difference between the atmospheric temperature and the liquid temperature of the liquefied propane gas. The production plant has the characteristic that the initial cost for the evaporation heat source equipment and the running cost of the equipment are zero, and as a result, city gas can be manufactured and supplied at extremely low cost.

However, in the aforementioned 13A propane air gas production plant by the present applicant, the design capability of the air-heated forced vaporizer was determined by considering the initial cost of the equipment, etc. The standard is continuous operation for 4 hours in windless conditions, so will it be difficult to use in cold regions or severe winters?

In some cases, it may not be possible.

For example, if we take Japan as an example, an air-heated forced vaporizer with the above design specifications can be used in areas south of the Kanto region, but in other areas, the vaporization capacity may decrease in the winter. Become. According to the results of the applicant's experimental research, the northern Kanto region is the northern limit.

Furthermore, even if the plant is located south of the Kanto region, continuous operation of the plant will result in severe frost formation on the vaporizer, making it necessary to have a spare air-heated forced vaporizer for switching, making the initial cost relatively high. .

Furthermore, if a hot water type paper riser is separately installed as a countermeasure for cold regions or severe cold seasons, the initial cost will be even higher.

Furthermore, in Japan, as a city gas production plant,
Attempts have also been made to produce butane air gas using liquefied butane gas as a raw material.

The liquefied butane used in the butane air gas plant has a high boiling point, i.e. about 15
℃, and requires vaporization using a vaporizer using electricity, hot water, or steam as a heat source.
The use of conventional air-heated forced vaporizers, such as those used in 3A propane air gas production plants, was not possible.

The main purpose of the present invention is to enable switching operation depending on climate conditions, such as air-heating in the summer and hot-water type in the winter, and to suitably operate LPG even in cold regions or severe cold seasons. It is an object of the present invention to provide an air-heated/hot water type vaporizer capable of vaporizing.

Another object of the present invention is to increase vaporization capacity and evaporation capacity, and to efficiently remove frost on the device caused by continuous operation, and to eliminate the need for a backup vaporizer for switching. It is an object of the present invention to provide a dual-purpose vaporizer for both air temperature and hot water.

Still another object of the present invention is to provide an air/hot water type vaporizer that can be used not only in a 13A propane air gas manufacturing plant but also in a butane air gas manufacturing plant. be.

The above-mentioned objects are achieved by the air/hot water type vaporizer according to the present invention. In summary, the present invention includes a supply manifold, a discharge manifold, and a plurality of heat transfer tubes connected at one end to the supply manifold and at the other end to the discharge manifold, The manifold includes a liquefied petroleum gas pipe connected to one end of each of the heat transfer tubes;
It has a double pipe structure with a jacket pipe arranged surrounding the outside of the liquefied petroleum gas pipe, the liquefied petroleum gas pipe is supplied with liquefied petroleum gas, and the jacket pipe is supplied with hot water. This is a dual-use air/hot water vaporizer. Preferably, the liquefied petroleum gas pipe is provided with an annular baffle plate, and the hot water is water mixed with antifreeze.

Next, the air-heating/hot-water type vaporizer according to the present invention will be explained in more detail with reference to the drawings.

FIG. 1 shows an embodiment of the air/hot water type vaporizer according to the present invention. According to this embodiment, the air/hot water type vaporizer 1 has a supply side manifold 2 and a discharge side manifold 4, and a heat transfer tube 6 is disposed between the supply side manifold 2 and the discharge side manifold 4. are connected in large numbers. Furthermore,
In order to improve the heat transfer (endothermic) effect of the heat transfer tube 6, heat transfer fins 8 are disposed around the heat transfer tube 6.

Further, according to the invention, as will be better understood with reference also to FIGS. 2 and 3, the supply manifold 2 includes:
Liquefied petroleum gas pipes (hereinafter referred to as rL) connected to each heat transfer tube 6
It is called PG tube j. ) 21 and a jacket pipe 22 disposed surrounding the outside of the LPG pipe 21.

One end 23 of the LPG pipe 21 protrudes from the jacket pipe 22 and is connected to an LPG storage tank (not shown), while the other end 24 is sealed and located within the jacket pipe 22. Further, as described above, the LPG pipe 21 is connected to the inlet end of the heat transfer tube 6 within the jacket pipe 22, and therefore, the LPG pipe 21 is connected to the inlet end of the heat transfer tube 6 within the jacket pipe 22.
PG flows into the heat transfer tube 6 and then flows to the exhaust pressure side manifold 4 to which the other end of the heat transfer tube 6 is connected.

The outer jacket tube 22 has an inlet 25 formed at one end and a pressure port 26 at the other end. The inlet 25 is connected via a supply line with a pump P to a hot water storage tank 31 of a hot water supply source 30, and the outlet 26 is returned to the hot water supply source 30 via a return line L2. Therefore, hot water from the hot water storage tank 31 is supplied to the inlet 25 of the jacket pipe 22 by the pump P via the supply pipe L1, and then heat exchanges inside the jacket pipe 22 with the LPG in the LPG pipe 2. 8026, and is returned to the hot water storage tank via the return pipe L2.

Further, it is preferable that baffle plates 27 are annularly provided at appropriate locations around the outer periphery of the jacket tube 22. Generally, the hot water flowing inside the jacket pipe 22 is
Because of frictional resistance, the area in contact with the outer surface of the liquid becomes like still water, reducing thermal conductivity. This occurs because the hot water flowing inside the pipe is a laminar flow, and can be prevented by creating a turbulent flow. To create turbulent flow, it is necessary to increase the speed of hot water flowing in the pipes to a critical speed or higher, but this requires a considerable amount of power and also shortens the residence time of hot water in the pipes. This results in a decrease in heat exchange efficiency.

On the other hand, according to the present invention, by providing the baffle plate 27, it is possible to generate turbulent flow within the pipe without increasing the flow velocity, thereby increasing heat conduction efficiency.

In this embodiment, the hot water storage tank 31 of the hot water supply source 30 is a hot water storage type hot water boiler, and is equipped with a heating source (not shown) such as a boiler. Therefore, the temperature of the hot water returned from the jacket pipe 22 to the hot water storage tank 31 via the return pipe L2 is determined by the temperature detection means 32 such as a thermistor disposed at a suitable position in the return pipe L2. The boiler combustion is controlled based on the difference from the temperature preset by the operator, and hot water at a predetermined temperature, for example, about 60° C. to 80° C., is constantly supplied into the jacket pipe 22. The amount of hot water supplied into the jacket pipe 22 will be variously selected depending on the desired vaporization capacity of the air/hot water type vaporizer.

In addition, the hot water supply source 30 is provided with a level detector 33 such as a level oscillator to keep the water level of hot water in the hot water storage tank 31 constant at all times. The valve L, that is, the pneumatic actuator valve 34 is controlled to adjust the amount of water supplied to the hot water storage tank 31 via the water supply line L.

In the present invention, the liquid used as hot water may be ordinary water, but antifreeze mixed water, which is water mixed with antifreeze, is preferable. This is based on the following logic.

In other words, for example, when liquefied propane gas is used as the raw material LPG, the LP of the air/hot water type vaporizer 1
Liquefied propane gas at a low temperature close to 42°C flows on G pipe 2. Therefore, even if hot water of about 60°C to 80°C is supplied to the jacket pipe 22 at a flow rate of 0.2 to 0.
,l! Even if the inflow is at
The inside that is in contact with it is cooled by the LPG, which is close to -42°C, and there is a risk of freezing. In particular, the flow velocity decreases due to frictional resistance from the center of the hot water fluid flowing inside the jacket pipe 22 to the top of the LPG pipes 2, and at the top surface of the LPG pipes 22, the flow velocity approaches zero (and reaches a state of still water). Therefore, in order to prevent freezing even if the hot water stops flowing, it is highly desirable, or in some cases necessary, to mix in antifreeze. Become.

The main component of antifreeze is ethylene glycol.
A commercially available antifreeze containing ~60% can be used,
The amount of antifreeze will vary depending on the conditions or region where the vaporizer is used, but will usually be water:antifreeze = 10:2-3.

The operation of the air temperature/hot water type vaporizer according to the present invention having the above configuration will be explained next.

For example, the air/hot water type vaporizer 1 of the present invention was used in a 13A propane air gas production plant that uses liquefied propane gas as a raw material and produces 13A propane air gas by mixing vaporized propane gas and air. shall be.

For example, during continuous operation for 4 hours with an atmospheric temperature of -8° C. or higher, cloudy weather, and no wind, such as in the summer, hot water is not circulated in the jacket pipe 22 of the air/hot water vaporizer 1. Therefore, the air temperature/hot water type vaporizer 1 is as follows:
It simply acts as an air-heated vaporizer. In other words, the liquefied propane gas (L
PG) is the supply side manifold 2, that is, the LPG pipe 2
It flows through the tube 1 heat transfer tube 6 to the discharge side manifold 4. At this time, the liquefied propane gas is vaporized by the action of the heat transfer tube 6 and the heat transfer fins 8, and the propane gas (
G).

On the other hand, when used in a very cold season or in a cold region where the atmospheric temperature is lower than 18°C, hot water at a predetermined temperature is supplied from the hot water storage tank 31 of the hot water supply source 30 by the circulation pump P. It is pumped into the jacket tube 22 of the supply manifold 2 via the supply line.

Liquefied propane gas (LPG) is supplied to the supply side manifold 2,
That is, the LPG is fed through two LPG pipes, and in the supply manifold 2 it exchanges heat with the hot water flowing in the jacket pipe 22, thereby vaporizing it. The vaporized propane gas (G) flows to the discharge side manifold 4 via the heat transfer tube 6. Therefore, in general, liquefied propane gas is not vaporized in the heat transfer tubes 6, but liquefied propane gas that is not vaporized in the supply side manifold 2 is completely vaporized in the heat transfer tubes 6.

The temperature of the hot water discharged from the outlet of the jacket pipe 22 and flowing through to the hot water storage tank 31 has been lowered by heat exchange with the liquefied propane gas, so that the temperature of the hot water has been lowered by heat exchange with the liquefied propane gas.
The temperature of the hot water is measured by a temperature detection means 32 disposed at a suitable location. Based on the signal from the temperature detection means 32, the heating of the hot water storage tank 31 is controlled, and the water fed from the hot water storage tank 31 to the jacket pipe 22 again is heated to a predetermined temperature.

Further, when the water level of the hot water in the hot water storage tank 31 decreases due to evaporation or the like, the level detector 33 detects the decrease in the water level, and the signal from the level detector 33 controls the valve 34 of the water supply line L3. Then, a predetermined amount of water is supplied to the hot water storage tank 31 via the water supply line L3.

In the above explanation, the hot water heating of the supply side manifold 2 was explained as being used in the severe cold season when the atmospheric temperature is lower than 18 degrees Celsius, or in a cold region. If frost forms on the heat transfer fins 8, hot water heating can be performed, and this makes it possible to automatically remove such frost. This avoids situations that require .

Furthermore, in the above explanation, the air temperature/hot water type vaporizer 1 of the present invention is used in a 13A propane air gas manufacturing plant, but the air temperature/hot water type vaporizer of the present invention is applicable to other LPG For example, it can be suitably used for vaporizing liquefied butane.

In other words, the liquefied butane used in the butane air gas plant has a high boiling point, approximately 15°C in the case of IKg/crrI''・G, making it impossible to use conventional air-heated forced vaporizers. , air temperature/hot water type vaporizer 1 of the present invention
can be suitably used, and it has become possible to achieve extremely efficient vaporization of liquefied butane.

11 Riseki 1 Since the air-heating/hot-water type vaporizer according to the present invention is configured as described above, (1) it is an air-heating type in the summer and a hot-water type in the winter;
Switching operation is possible depending on climatic conditions, etc., and LPG can be suitably vaporized even in cold regions or severe cold seasons.

(2) Hot water heating increases the vaporization capacity and evaporation capacity of the air-temperature vaporizer, and hot water heating makes it possible to remove frost on heat transfer tubes and the like, eliminating the need for a switching preliminary vaporizer.

(3) Not only can it be suitably used in a 13A propane air gas production plant, but it can also be used in a butane air gas production plant where conventional air-heated forced vaporizers cannot be used.

It has various benefits such as:

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of an air/hot water type vaporizer according to the present invention. FIG. 2 is a perspective view of the supply manifold. FIG. 3 is a cross-sectional view of the supply manifold. l: Air/hot water combined type vaporizer 2: Supply side manifold: Exhaust 8 side manifold: Heat transfer tube: Heat transfer fin 1: Liquefied petroleum gas pipe 2; Jacket tube 7: Annular baffle plate 0: Hot water supply source

Claims (1)

[Scope of Claims] 1) A supply manifold, a discharge manifold, and a plurality of heat transfer tubes connected at one end to the supply manifold and at the other end to the discharge manifold, The side manifold has a double pipe structure including a liquefied petroleum gas pipe connected to one end of each of the heat transfer tubes and a jacket pipe disposed surrounding the outside of the liquefied petroleum gas pipe. 1. A vaporizer for both air and hot water use, characterized in that liquefied petroleum gas is supplied to the petroleum gas pipe, and hot water is supplied to the jacket pipe. 2) The air/hot water type vaporizer according to claim 1, wherein the liquefied petroleum gas pipe is provided with an annular baffle plate. 3) Claim 1, wherein the hot water is water mixed with antifreeze.
Or the air temperature/hot water type vaporizer described in 2.