JPS6242652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquefied gas vaporization apparatus, and more particularly to an air heat source type low-temperature liquefied gas vaporization apparatus in which there is no blockage in the pipes and the components of the discharged gas do not change due to changes in load.

An air heat source type low-temperature liquefied gas vaporizer that uses the atmosphere as a heat source (hereinafter simply referred to as a liquefied gas vaporizer) is a device that vaporizes pressurized liquefied city gas, etc.
Although it is an extremely important device, conventional devices are
As shown in FIGS. 2 and 2, a plurality of (n) finch tubes 1 _{to 1} are arranged in parallel so that their centers are on the same plane, and the upper and lower ends of the adjacent tubes are alternately connected to the connecting tubes 4. In general, a plurality of rows (m rows) connected in series are arranged in parallel to form a heat exchange section, and the headers 5 and 6 have nozzles 9 and 10, respectively, in the connecting pipes at both ends.
It is configured by connecting. The low-temperature liquefied gas is supplied from the nozzle 9 and evenly distributed from the header 5 to the plurality of rows of heat exchange sections 1 ₁₁ to 1 _n1 . The fin tube has a cross section as shown in FIG. 3, and consists of a fin 2 and a tube portion 3. While passing through the fin tube 1 _ij , the low-temperature liquefied gas absorbs heat from the atmosphere in contact with the outer surfaces of the fin 2 and tube portion 3 and vaporizes. Therefore, the heat exchange part near the inlet is in a gas-liquid mixed state, and the outlet part is in a superheated vaporized gas state.

However, with such conventional equipment, when vaporizing multi-component low-temperature liquefied gas under a pressure of about 1 to 10 kg/cm ² G, low-temperature liquefaction is performed at low load, that is, when the demand for vaporized gas decreases. A part of the heavy components of C ₄ H ₁₀ or more in the gas clogs the finch tube 1 or the connecting pipe 4, obstructing the flow of the gas and deteriorating the heat transfer performance. Further, even if the pipe did not become clogged, the vaporized gas released contained less heavy components, and the composition of the vaporized gas varied depending on the load variation. When the components of vaporized gas differ, the calorific value of the gas changes, and in cases where the calorific value needs to be constant at all times, such as city gas, it is extremely difficult to adjust the calorific value according to changes in the load. There was an uneconomical problem.

The inventors of the present invention have improved the shortcomings of the prior art, and have conducted repeated studies to make multi-component low-temperature liquefied gas so that the components of the supplied gas and the released gas are the same regardless of load fluctuations. This led to the present invention.

That is, the present invention provides an air heat source type low-temperature liquefied gas vaporizer having a heat exchange section in which a plurality of vertically oriented finch tubes are arranged horizontally and the upper and lower ends of the adjacent finch tubes are connected alternately in series. , the liquefied gas inlet is opened in the middle part of the finch tube to which the liquefied gas inlet is connected, a liquid storage part is provided below the liquefied gas inlet, and the lower part of the liquid storage part and the heat exchange part outlet pipe are connected to each other for flow rate adjustment. This is a liquefied gas vaporization device characterized by being connected by a pipe having a mechanism.

The present invention will be specifically described below with reference to the drawings. Fig. 4 is a side view showing the liquefied gas vaporization apparatus of the present invention, and the difference from the conventional apparatus (Figs. 1 and 2) is that the finch tube 1 on the low temperature liquefied gas supply side
The lower part of the pipe part 3 is enlarged to the extent that the fins 2 remain on the outer periphery to form the liquid storage part 11, and the lower part of each liquid storage part _11-n is connected to the inlet side header 7. At the bottom, a pipe 13 is connected to an outlet pipe 15 of the outlet side header 6 via a flow rate adjustment mechanism 14. Figure 5 shows the inside of the outlet pipe 15 (Figure 4A).
1) is a sectional view for explaining the outlet pipe 1.
A tube 13 is inserted into the inside of the tube 5, and the tip of the tube 13 is bent downstream so as to be parallel to the flow direction of the vaporized gas, and a spraying mechanism 18 is provided at the tip.

In FIG. 4, the low-temperature liquefied gas containing heavy components supplied from the nozzle 9 passes through the header 5, is evenly distributed to a plurality of rows of heat exchange sections, and enters the upper part of the heat storage section 11.

Since the flow rate adjustment mechanism 14 of the present invention is adjusted so that the flow rate corresponds to the proportion of the heavy components in the supplied liquefied gas, the amount of the heavy components in the supplied liquefied gas that has entered the upper part of the liquid storage section 11 is The amount corresponding to the amount enters the liquid storage section 11, and the remaining amount goes toward the upper finch tube 1. Therefore, first of all, when there is a large demand for vaporized gas, that is, when the load is large, the gas velocity passing through the Finch-Yub tube 3 is high, so that unevaporated heavy components do not remain and are mixed with the vaporized gas. During this time, it gradually becomes mist-like.
In addition, the surrounding gas becomes superheated one after another, and this superheated gas vaporizes the heavy components in the form of mist.It becomes even more superheated and flows from the last stage finch tube _1io to the outlet side header 6 and into the pipe 15. do. In this way, when the load is large and all the heavy components in the supplied liquid gas are entrained and finally vaporized, a large amount flows from the liquid storage section 11 into the pipe 13, so the vaporized gas rises in the liquid. The fluidization speed of the liquid is greater than the flow rate, and the liquid accumulated in the liquid storage section 11 contains the components of the supplied liquefied gas itself. The liquid in the liquid storage part 11 passes through the header 7 and the pipe 13, is sprayed from the spray mechanism 18, mixed with vaporized gas, and sent out. In this case, of course, the composition of the vaporized gas released is equal to the composition of the supplied liquefied gas.

Next, if demand fluctuates and the load becomes smaller, the amount of low-temperature liquefied gas supplied to this device will decrease.
Because the gas flow velocity in the Finch-Eube tube becomes slower,
The unevaporated heavy components are no longer entrained, and the liquefied gas rich in heavy components remains in the liquid storage section 11. In the liquid storage section 11, low boiling point components are vaporized by heat entering from the outside, rise and move into the pipe 3, so the amount of heavy components gradually increases, and if the low load condition continues, the heavy components will eventually It will be only for the minute. On the other hand, the vaporized gas is sent from the final finch tube to the outlet side header 6 and then to the pipe 15, but this gas is rich in light components compared to the liquefied gas components at the time of supply. However, in the present invention, the heavy mass accumulated in the liquid storage part 11 is sent to the pipe 13, passed through the flow rate adjustment mechanism 14, and is sprayed from the spray mechanism 18. The amount of gas sprayed from the flow rate adjustment mechanism is the same as when the load is high, but the gas components sprayed when the load is low are mostly heavy components, and the components of the vaporized gas mixed and discharged from the pipe 15 are supplied. It becomes equal to the liquefied gas component.

In this manner, the apparatus of the present invention can always deliver vaporized gas having the same components as the supplied liquefied gas. In addition, at low loads, all heavy components accumulate in the first stage finch tube 1 _i1 and do not flow into the second stage or later.
It does not remain in the connecting pipe 4 or pipe 3 in the subsequent stages. Therefore, even if the load suddenly increases and low-temperature liquefied gas flows in, it will not come into contact with the gas and will not clog the pipe due to solidification or increased viscosity.

In addition, in the present invention, the flow rate adjustment mechanism 14 is closed in a range where the load is large and the unevaporated heavy components are sufficient to flow along with other gases, and the load is reduced to a flow rate that does not allow the heavy components to be entrained. You can also adjust it so that it activates when you get used to it.

Further, if it is necessary to superheat the vaporized gas to further raise the temperature, a necessary number of stages of finch tubes can be provided after the heavy fraction spraying mechanism 18, as shown in FIG.

Furthermore, if the load decreases too much and the heavy material cannot be kept in the first stage finch tube and there is a possibility that it will flow into the second stage, _the 1 _i0 stage is provided for 1 _i0
It is also possible to connect the top part of 1 _i1 and the middle part of 1 i1 with a pipe 17 to make the heavy fraction separation part double or multiple. Further, the liquid storage section 11 can also have a structure shown in FIG. 8.

[Brief explanation of the drawing]

1 and 2 are a side view and a plan view, respectively, showing a conventional liquefied gas vaporization device, FIG. 3 is a cross-sectional view of a finch tube, and FIG. 4 is a side view of a liquefied gas vaporization device according to the present invention. , FIG. 5 is a sectional view of part A in FIG. 4, FIGS. 6 and 7 are side views showing other embodiments of the present invention, and FIG. 8 is a sectional view showing another embodiment of the supply section. . 1... Finch Yub, 2... Finn, 3...
Pipe part, 4... Connection pipe, 5, 6, 7... Header,
9,10...Nozzle, 11...Liquid storage part, 12,1
3, 15, 17... pipe, 14... flow rate adjustment mechanism,
18... Spraying mechanism, j, n... Number of series stages, i, m
...Parallel number.

Claims (1)

[Claims] 1 In an air heat source type low temperature liquefied gas vaporizer having a heat exchange section in which a plurality of vertically oriented finch tubes are arranged horizontally and the upper and lower ends of adjacent finch tubes are connected alternately in series, the liquefied gas inlet is connected. The liquefied gas inlet is opened in the middle part of the finch tube, a liquid storage part is provided below the liquefied gas inlet, and the lower part of the liquid storage part and the heat exchange part outlet pipe are connected by a pipe having a flow rate adjustment mechanism. A liquefied gas vaporization device characterized by: