JPH0463989B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an absorption chiller/heater, and in particular to a hydrogen permeation device suitable for releasing hydrogen gas generated during heating operation from a hydrogen permeation device installed in a gas storage chamber. Regarding absorption chiller/heater.

[Conventional technology]

The configuration of a conventional absorption chiller/heater will be explained using FIG. 2. An evaporator/absorber storage container 4 that houses an evaporator 1 and an absorber 2 and has a cooling/heating switching valve 7 provided at the bottom in a pipe 20 that guides heated steam and solution from the regenerator; A hydrogen permeation system is provided at the top of the containment vessel 4 and consists of a hydrogen release pipe 9 made of palladium (Pd) or its alloy, which permeates and releases hydrogen in noncondensable gas, and a heater 8 that raises the temperature of this pipe 9. The device 10 is connected to the evaporator/absorber containment vessel 4 through a pipe 17, and has a cooling water pipe 16 inside thereof. , a gas-liquid separator 6 having a pipe 19 connected from the bottom to the bottom of the evaporator/absorber containment vessel 4, a pipe 14 from the top of the gas-liquid separator 6 opening at the bottom, and a hydrogen release pipe at the top. 9 and a gas storage chamber 3 having a hydrogen permeation device 10 comprising a heater 8 for raising the temperature of the tube 9. Next, the operation will be explained.

During cooling, the non-condensable gas in the evaporator 1 and absorber 2 is extracted by the gas bleed device 5 through the pipe 17, and the non-condensable gas that descends through the gas downcomer pipe 15 is separated from the liquid by the gas-liquid separator 6. After that, it ascends the tube 14 and is stored in the gas storage chamber 3. However, when the hydrogen partial pressure in the non-condensable gas becomes high, the hydrogen in the non-condensable gas passes through the tube 12 and is heated by a heater 8 to a hydrogen release tube 9 made of Pd or its alloy. released from. In addition, when cooling, the evaporator
Since the hydrogen partial pressure in the absorber containment vessel 4 is low, little hydrogen is released from the hydrogen permeation device 10 provided in the containment vessel 4.

When heating operation starts, the cooling switching valve 7 opens and superheated steam and solution from the regenerator (high-temperature regenerator) flow into the evaporator/absorber containment vessel 4 through the pipe 20, and the evaporator/absorber container 4 flows through the pipe 20.
The pressure within the absorber containment vessel 4 begins to rise. The pressure in gas storage chamber 3 is the same as when it is stopped, so pipe 1
9, 15, 14, superheated steam flows into the gas storage chamber 3 together with the solution in the separator 6, but when the pressures in the gas storage chamber 3 and the evaporator/absorber containment vessel 4 are balanced, the solution flows back into the piping. The liquid then returns to the separator 6, and the Sass storage chamber 3 and the evaporator/absorber storage container 4 are sealed. The non-condensable gas thus generated is accumulated in the evaporator/absorber containment vessel 4,
Since the hydrogen partial pressure in the non-condensable gas also increases, hydrogen is released from the hydrogen permeation device 10 provided at the top.

[Problems to be solved by the invention]

In the conventional water absorption chiller/heater, hydrogen in non-condensable gas is released using a hydrogen permeation device 10 installed in the gas storage chamber 3 during cooling, and a hydrogen permeation device 10 installed at the top of the evaporator/absorber containment vessel 4 during heating. Since the hydrogen permeation device 10 is provided, two hydrogen permeation devices 1
0 is required. However, since the hydrogen discharge tube 9 made of Pd or its alloy is expensive, providing two of the same device 10 increases the cost.

An object of the present invention is to provide a U-shaped pipe between the evaporator/absorber containment vessel 4 and the gas storage chamber 3 so that hydrogen can be released during heating using the hydrogen permeation device 10 installed in the gas storage chamber 3. The objective is to reduce the number of permeation devices 10 to one.

[Means for solving problems]

The above problem is related to the evaporator/absorber containment vessel which houses the evaporator and absorber and is connected by a cooling/heating switching valve that controls the steam and solution from the regenerator; A U-shaped pipe having an opening for one of the upright pipes at the bottom, and a portion of the other upright pipe whose cross-sectional area is larger than the other upright pipes at a predetermined height; a gas storage chamber having an open end of the piping and a hydrogen release pipe for permeating and releasing hydrogen in the non-condensable gas; a gas-liquid separator connected to the piping from the gas storage chamber; the gas-liquid separation piping connecting the evaporator and the evaporator/absorber storage container; and a gas bleed device connected to the evaporator/absorber storage container by piping and connected to the gas-liquid separator by piping. Solved by absorption chiller/heater.

[Effect]

Next, the effect will be explained.

When cooling is stopped, the pressures in the absorber/evaporator space 4 and the gas storage chamber 3 are the same unless there is non-condensable gas, so the liquid level in the U-shaped pipes 24 and 23 is equal to that in the pipe 23 in the liquid receiver 22. The height of the opening is below. Similarly, the liquid level in tubes 19, 15, 14 is below the height of the opening in tube 19. When the heating operation starts, the cooling/heating switching valve 7 opens and the superheated steam and solution from the high temperature regenerator of the regenerator flow into the absorber/evaporator storage vessel 4 through the pipe 20 . As a result, the absorber/evaporator containment vessel 4
pressure begins to rise. Since the pressure in the gas storage chamber 3 is the same as during stoppage, the liquid level in the pipes 23, 19, 15 falls, and the liquid level in the pipes 24, 14 rises. When the liquid level enters the portion of the tube 24 with a large cross-sectional area, the rise in the liquid level in the tube 24 is smaller than the distance by which the liquid level in the tube 23 falls because the internal cross-sectional area of the tube is large. Even though the internal cross-sectional area of the pipe 19 is equal to the cross-sectional area of the pipe 14, the solution in the gas downcomer pipe 15 from the lower part of the gas bleed device 5 also descends. The liquid level rises significantly.

Therefore, before the liquid level in the gas downcomer pipe 15 drops to the opening of the gas downcomer pipe 15 of the gas-liquid separator 6 and the liquid level in the pipe 14 reaches the gas storage chamber 3, the U-shaped pipe 2
At 3 and 24, the height of the liquid column becomes smaller than the pressure difference between the gas storage chamber and the superheated steam, and is pressed by the superheated steam,
The solution in the U-shaped tubes 23, 24 flows into the gas storage chamber 3 together with superheated steam.

The pressure of the superheated steam flowing into the gas storage chamber 3 increases through the U-shaped pipes 23 and 24, and the solution falls from the pipe 14, and the solution in the pipes 14 and 15, which is above the height of the opening of the pipe 19, rises. passes through the gas-liquid separator 6 and the pipe 19 and returns to the lower part of the evaporator/absorption/containment vessel 4.

Therefore, the U-shaped tubes 23 and 24 become a steam layer. Hydrogen generated inside the absorption chiller/heater by this vapor layer is released by the hydrogen permeation device 10 in the gas storage chamber 3. During cooling, the solution from the concentrated solution riser pipe 18 is dripped into the absorber 2, absorbs the vapor from the evaporator 1, and falls to the lower part of the absorber 2. The fallen solution flows from the liquid receiver 22 into the pipe 23 up to a liquid level that indicates the pressure difference between the gas storage chamber 3 and the lower part of the absorber 2. Therefore, the pressure difference between the gas storage chamber 3 and the absorber 2 is maintained.

〔Example〕 An embodiment of the present invention will be explained with reference to FIG.

An evaporator/absorber containment vessel 4 that houses a steam generator 1 and an absorber 2 and has a cooling/heating switching valve 7 provided at the bottom of a pipe 20 that guides superheated steam and solution from a regenerator, and this containment vessel 4. One pipe 23 has a liquid receiver 22 that opens above the liquid level of the stored solution at the bottom of the pipe, and the other pipe 24 has a cross-sectional area larger than that of the other parts of the U-shaped pipe at a predetermined height or higher. 24, and the upper end of the other pipe 24 of this U-shaped tube opens above the bottom surface, and the pipe 1 is connected to the top.
a gas storage chamber 3 having a hydrogen permeation device 10 configured with a hydrogen release tube 9 made of Pd or its alloy, which is heated by a heater 8 through a gas storage chamber 2; and piping led out from the bottom of the gas storage chamber 3; A gas-liquid separator 6 is connected to the top of the pipe 14 and a pipe 15 from the gas extractor 5, and a pipe 19 led out from the bottom opens to the bottom of the evaporator/absorber containment vessel, and a pipe 17 from the top is connected to the gas-liquid separator 6. It is connected to the evaporator/absorber containment vessel 4, a pipe 15 coming out from the bottom is connected to the gas-liquid separation gas 6, and a gas extraction device 5 has a cooling water pipe 16 inside, and its operation is as follows. As stated at the top of [Effect].

〔Effect of the invention〕

According to the present invention, by providing U-shaped pipes with different cross-sectional areas between the evaporator/absorber storage container and the gas storage chamber, a hydrogen permeation device can be used in common during cooling and heating, This has the excellent effect of simplifying the device and reducing costs by using only one hydrogen permeation device.

[Brief explanation of drawings]

FIG. 1 is an equipment piping diagram showing an embodiment of the present invention;
FIG. 2 shows the equipment piping diagram of the conventional device. 1... Evaporator, 2... Absorber, 3... Gas storage room, 4... Evaporator/absorber storage container, 5... Gas extraction device, 7... Cooling/heating switching valve, 9... Hydrogen release pipe , 19... Connection pipe between the gas-liquid separator and the evaporator/absorber storage vessel, 23, 24... U-shaped pipe.

Claims (1)

[Claims] 1. An evaporator/absorber containment vessel that houses the evaporator and absorber and is connected by a cooling/heating switching valve that controls the steam and solution from the regenerator; a U-shaped pipe having an opening for the vertical piping, and the cross-sectional area of the other vertical piping having a predetermined height or more is larger than that of the other vertical piping; the end of the other vertical piping of the U-shaped pipe; a gas storage chamber having a hydrogen release pipe which is open at the end and which allows hydrogen in the non-condensable gas to permeate and release; a gas-liquid separator connected to piping from the gas storage chamber; the gas-liquid separator and the It is characterized by comprising: piping connecting the evaporator/absorber containment vessel; and a gas extraction device connected to the evaporator/absorber containment vessel by piping and to the gas-liquid separator by piping. Absorption chiller/heater.