JPH0359722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for receiving a single series or multiple series of two-phase flow condensates that may form a gas-liquid mixture such as water or dowsam, and for discharging these condensates within a tank body. This invention relates to an improvement in a gas-liquid separation tank that has the function of separating a single-phase fluid into a single-phase fluid and sending it to a supply destination by itself using a pump or a hydrostatic head.

Prior Art Heat exchangers that utilize condensation heat always handle two-phase flows of steam and water, and are in a saturated state. and,
Pumps are often used to transport saturated water in two-phase flow to other equipment. At this time, if the net suction head required for the pump is not secured, cavitation may occur. In order to prevent such cavitation, conventionally, a gas-liquid separation tank has been used in which the water level in the tank T for storing saturated water and the height of the pump P are adjusted as shown in FIG. 3. Note that H is a header and C is a heat exchanger.

Problems to be Solved by the Invention However, when the pressure inside the heat exchanger C decreases, cavitation may occur if saturated water before the pressure decrease flows into the pump P.

Therefore, the present invention has been made in order to solve the problems of the prior art, and is designed to prevent cavitation of the pump even if the pressure decreases due to a certain degree of load change on the heat exchanger side. The purpose of the present invention is to provide a new gas-liquid separation tank.

Means for Solving the Problem To achieve this objective, the gas-liquid separation tank of the present invention comprises a single or multiple series of two-phase flow drains that may form a gas-liquid mixture such as water or dowsomes. The inflowing two-phase fluid is separated into gas and liquid in a gas-liquid separation tank that accepts the fluid in series, separates these within the tank body, and sends it as a single-phase fluid to the supply destination by itself using a pump or hydrostatic head. A primary separator is provided above the tank body for the purpose of the tank body, and a secondary separator is provided at the bottom of the downcomer pipe that passes the liquid separated by the primary separator into the liquid stagnant in the tank body, and A two-liquid mixing section for absorbing an imbalance between the downcomer pipe flow rate and the pump inlet flow rate is provided in a part of the tank body facing the lower discharge port of the downcomer pipe, and is connected to the drain pipe. .

EXAMPLES The details of the invention will now be described with reference to illustrative examples.

FIG. 1 shows a schematic sectional view of a gas-liquid separation tank of the present invention. In the same figure, in a tank that separates two-phase fluid into steam and water (liquid), a vent pipe 7 is provided at the upper end of the tank body 8, and a primary steam and water separator that separates fluid and gas is provided at the upper end of the tank body 8. 2, and the primary steam/water separator 2 is provided with a plurality of inflow pipes 1 and downcomer pipes 3.

The inflow pipe 1 penetrates into the lower part of the tank body 8 from the outside and enters the primary steam separator 2, and the tip of the inflow pipe 1 is connected to the lower end of the primary steam water separator 2. There are two ways to connect, as shown in Fig. 2a, the tip of the inflow pipe 1 is set flush with the bottom surface of the primary steam water separator 2, and as shown in Fig. 2b. The tip of the inflow pipe 1 may be set to slightly protrude upward from the bottom surface of the primary steam/water separator 2.

The downcomer pipe 3 is arranged from the lower end of the primary steam-water separator 2 to the lower part of the tank body 8, and at the lower part, the downcomer pipe 3 changes direction from vertical to horizontal, and has two pipes at the tip of the horizontal part. A secondary steam/water separator 4 is installed. The secondary steam/water separator 4 has a cylindrical shape, with an air vent 4a at the upper end and a liquid drain port 4b at the lower end.

The tank body 8 facing the liquid drain port 4b
At the bottom of the drain port 4, there is a two-liquid mixing section 5 that absorbs the imbalance between the downcomer flow rate and the pump inlet flow rate.
The mixing section 5 is connected to a drain pipe outside the tank, and is led to a pump or the like (see FIG. 3).

First, the two-phase fluid that enters the primary steam/water separator 2 from the heat exchanger C (see Fig. 3) via the inflow pipe 1 is separated from the gas in the liquid in the primary steam/water separator 2. are separated.

Subsequently, the liquid passes through the downcomer pipe 3 and enters the secondary steam/water separator 4, and even if gas is involved at the upper inlet of the downcomer pipe 3, it is further separated in the secondary steam/water separator 4,
Air bubbles form from the air bubble vent 4a at the upper end and rise to the upper part of the tank body 8.

Since the liquid drain port 4b at the lower end of the secondary steam/water separator 4 is separated from the mixing section 5, the liquid separated from the bubbles will accumulate in the tank body 8 when the pressure at the drain port 4b decreases. Since the saturated water, which has a lower temperature than water, enters the mixing section 5, it is in a state where it easily flows to the drain pipe 6.

Further, since the discharge port 4b and the mixing section 5 are separated, when the pump inlet flow rate is higher than the flow rate of the downcomer pipe 3, the inlet of the secondary steam separator 4 is connected to the tank body. 8. Stagnant water at the bottom can be sucked in.

Furthermore, since multiple series of two-phase fluids with different temperature conditions, flow rates, etc. are separated by the primary steam/water separator 2 and are simultaneously mixed and guided to the downcomer pipe 3 in a uniform state, the liquid level due to falling liquid etc. It is also possible to prevent the rippling phenomenon. Although not shown in the drawings, a system for controlling flow loads on the inflow and outflow sides, an overflow, make-up and liquid level control system, etc. are naturally provided.

Effects of the Invention As described above, according to the gas-liquid separation tank for two-phase fluid of the present invention, even if the primary steam separator cannot separate the gas, the secondary steam separator can separate the gas, so the pump Cavitation is less likely to occur. Furthermore, since the liquid is guided to the pump through the mixing section provided to absorb the imbalance between the downcomer flow rate and the pump inlet flow rate, cavitation of the pump is less likely to occur.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an example of the gas-liquid separation tank of the present invention, and FIGS. 2a and 2b show two different aspects of the connecting portion between the primary steam-water separator and the inflow pipe in the same gas-liquid separation tank. The enlarged view shown in FIG. 3 is a schematic diagram showing the installation state of a conventional gas-liquid separation tank. 1...Inflow pipe, 2...Primary steam water separator, 3...
Downpipe, 4...Secondary steam/water separator, 5...Mixing section,
6...Discharge pipe, 7...Vent pipe, 8...Tank body.

Claims (1)

[Claims] 1 Accepts a single line or multiple lines of two-phase flow drain that may form a gas-liquid mixture such as water or dowsome, and separates these within the tank body,
In a gas-liquid separation tank that has the function of transporting a single-phase fluid to a supply destination by itself using a pump or a hydrostatic head, a primary gas-water separator is installed inside the tank body to separate the inflowing two-phase fluid into gas and liquid. A secondary steam/water separator is provided at the bottom of a downcomer pipe which is provided above and passes the liquid separated by the primary steam/water separator into the liquid remaining in the tank body, and a secondary steam/water separator is provided at the bottom of the downcomer pipe. A gas-liquid separation tank for a two-phase flow fluid, wherein a two-liquid mixing part for absorbing an imbalance between the downcomer pipe flow rate and the pump inlet flow rate is provided in a part of the tank body facing the discharge port, and the two-liquid mixing part is connected to the drain pipe.