JP3314566B2 - Jet condenser for geothermal power plant and method of operating the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet condenser used in combination with a condenser turbine of a geothermal power plant.

[0002]

2. Description of the Related Art As a thermal cycle system for a geothermal power plant, a condensing turbine is driven by steam collected from a steam well, and then steam discharged from the turbine is guided to a condenser to expand it to a sufficiently low pressure. Water turbine systems are well known. In addition, since there is no need to recover condensate in a geothermal power plant, a jet condenser is widely used as a direct contact condenser.

FIG. 2 shows the above-mentioned condensing turbine type geothermal power plant, wherein 1 is a steam well, 2 is a condensing turbine, 3 is a generator, 4 is a jet condenser, and 5 is a cooling tower. , 6 is a circulating water pump, 7 is a gas extractor (such as a steam ejector). Next, the conventional structure of the jet condenser 4 is shown in FIG. 3 (cross-sectional view of the jet condenser). In the figure, reference numeral 8 denotes a condenser body (shell), a condenser section 10 at the center of the inside of the body via a partition wall 9, and a gas cooling section 1 on both left and right sides.
1 and a sprinkling pipe 12 with a spray nozzle for spraying cooling water is drawn through an inlet valve 13 in the body so as to extend over both the condensing section 10 and the gas cooling section 11. The gas extractor 7 is connected to the gas cooling unit 11 via a gas extraction valve 14. Here, the sprinkling pipe 12 is configured and piped as described below. In other words, on the bottom side of the inside of the body, two branches branched from the inlet valve 13
A series of watering mother pipes 12A, 12B are distributed and piped, and a number of spray nozzles 12b are provided on the peripheral surface along the length of a branch pipe 12a that branches from each watering mother pipe 12A, 12B and rises upward. Have.

A hot well (not shown) is provided on the bottom side of the condenser body 1 (in the case of a low-condensing condenser, it is provided on the bottom side of the condenser body, and in the case of the barometric condenser, (Which is provided below a tail pipe extending downward from the water tank), and the circulating water pump 6 shown in FIG. 2 is connected to the hot well. In addition, the power generation output is 3
In a condenser adopted for a geothermal power plant of 0 MW class or higher, the condensed water is circulated and fed by using two circulating water pumps 6 (one pump shares 50% of the amount of water previously fed) as a standard. Like that.

The operation of such a jet condenser is well known, and the steam discharged from the condenser turbine is sprayed from the spray nozzle 12b of the water spray pipe 12 to the surroundings at the condenser section 10 of the condenser body 8. The cooling water is supercooled to a temperature below the saturation temperature by direct contact with the fine particles, condensed, collected as condensed water at the bottom of the body, and then sent from the hot well to the cooling tower 5 by the circulating water pump 6, where the room temperature After cooling to the water sprinkling pipe 12, the water is supplied under pressure again. In addition, sulfide gas, non-condensable gas such as CO ₂ , air mixed with cooling water, and steam accompanying these gases contained in natural steam collected from the steam well are cooled by the gas cooling unit 11 in the same manner. The gas is cooled by spraying to reduce the gas volume, and the condensed vapor is condensed and separated, and then exhausted out of the system via the gas extraction valve 14 and the gas extractor 7.

[0006]

However, in the above-described condenser having the conventional structure, the following problems may occur during operation. In other words, in the operating state in which the condensate of the exhaust steam condensed by the condenser is shared by two circulating water pumps and the water is conveyed, if one of the pumps fails and the operation becomes one-lung, , The spray pressure of the spray nozzle 12b of the sprinkler pipe 12 is insufficient, and the spray condition of the cooling water is deteriorated. Come to come.

[0007] Therefore, conventionally, including a spare pump, 3
There are two circulating water pumps installed and measures are taken to continue operation using a spare pump in case of pump failure, but having such a spare pump increases initial cost Is not always a good idea.
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to solve the above-mentioned problems, and to maintain a condensate capacity corresponding to the case where one of the two circulating water pumps fails. An object of the present invention is to provide a jet condenser capable of continuing operation without hindrance, and an operation method thereof.

[0008]

In order to achieve the above object, a jet condenser according to the present invention is provided with a spray nozzle having a spray nozzle which is distributed in two lines over both a condenser section and a gas cooling section. A cooling water inlet valve shall be provided for each system for the water pipe. Further, in addition to the above configuration, the gas cooling section defined in the condenser body is divided into two sections, and for each section, one water sprinkling pipe is accommodated, and gas extraction is performed via a gas extraction valve. It is good to connect a container.

If one of the two circulating water pumps fails during the operation of the condenser, one of the cooling water inlet valves of the two water sprinkling pipes and the corresponding gas cooling section section. With the gas extraction valve closed and the steam turbine output reduced by half, the remaining one circulating water pump, one system watering pipe and
And the gas extractor in the gas cooling section shall be operated continuously.

[0010]

In the event that one of the two circulating water pumps fails during the operation of the jet condenser having the above-described configuration, the amount of pump water is reduced by half as compared with the normal operation. But,
In this case, by closing one inlet valve of the two-line sprinkler pipe, the amount of cooling water sprayed into the body from the sprinkler pipe is reduced by half compared to the steady state, but the spray pressure of the spray nozzle can be maintained, Thereby, a good spray state of the cooling water is ensured in the condenser body.

In addition, the gas cooling unit is divided into two sections corresponding to the water sprinkling pipes of each system, and a gas extractor is connected to each section via a gas extraction valve. If the gas extraction valve in the section on the spray stop side is closed during single-lung operation, the non-condensable gas and associated vapor flow only to the section on the side where the cooling water is sprayed. Function is not reduced.

Therefore, even if one of the circulating water pumps fails, the amount of steam discharged from the steam turbine is halved, that is, the power generation output is halved, so that the geothermal power plant including the condenser can be continued without any trouble. Can drive.

[0013]

[Embodiment] The following describes a low-profile jet-type condenser.
An embodiment of the present invention will be described with reference to FIGS.
In the drawings of the embodiment, the same members corresponding to FIG. 3 are denoted by the same reference numerals. That is, in the jet type condenser of the illustrated embodiment, the inlet valves 13A, 13B are provided for each of the water spray mother pipes 12A and 12B which are piped in two lines in the body of the condenser body 8 respectively. is to be sprayed toward each sprinkler main pipe 12A, the barrel from the spray nozzle 12b of the water supply and cooling water 12B through connected and, said inlet valve individually. In addition, the above-mentioned watering mother pipes 12A, 12A
The gas cooling unit 11 is divided into two sections 11a and 11b via a central partition wall 9a in accordance with the arrangement of B, and a gas extraction valve 14 is attached to each section 11a and 11b to perform gas extraction. Connected to the container 7. At the bottom side of the condenser body 8, hot wells 15 are provided dispersedly at two places, and one circulating water pump 6 is connected to each hot well 15, and the hot wells are provided by a total of two pumps. The condensed water collected in 15 is sent to a cooling tower (see FIG. 3).

With this configuration, the inlet valve 13 is operated during a normal operation.
A, 13B, and each section 11A, 1 of the gas cooling unit 11
1B, all the gas extraction valves 14 are opened, cooling water is supplied to the watering mother pipes 12A, 12B of each series, and the cooling water is sprayed into the body from the spray nozzle 12b to recover exhaust steam flowing from the steam turbine. Instead of using water, the two circulating water pumps 6 are operated to convey the condensed water accumulated in the hot well 15 to the cooling tower at the subsequent stage.

Meanwhile, in the case where one of the circulation water pump 6 in two during operation of the power plant fails, two series of water spray header pipe 12A, either one of 12B, for example, water spray header tube 1
The inlet valve 13B connected to 2B is closed, and the gas outlet pipe 14 connected to the section 11B of the gas cooling unit 11 is closed, and at the same time, the amount of steam supplied to the steam turbine is reduced by half. As a result, even in the one-lung operation state of the circulating water pump 6, a sufficient spray pressure is secured at the spray nozzle on the water supply side, and the discharged steam can be condensed while maintaining a good spray state. . In addition, non-condensable gas, air, and steam accompanying these gases mixed in the exhaust steam flow in a concentrated manner in the section where the cooling water is sprayed in the gas cooling unit 11, so that the gas cooling function is not provided. There is no danger of lowering. As a result, although the power generation output is lower than in the normal operation, the operation of the geothermal power plant can be continued using the remaining one healthy circulating water pump.

Although the illustrated embodiment has been described with reference to the low-profile type jet condenser, it goes without saying that the same can be applied to a barometric condenser.

[0017]

As described above, according to the present invention, even if one of the two circulating water pumps provided in the jet condenser is out of order, the remaining one pump can be used. The operation of the condenser can be continued without any trouble. Therefore, the reliability of the jet-type condenser is improved, and there is no need to prepare a spare unit for the circulating water pump, so that the initial cost of the power generation plant can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a jet-type condenser according to an embodiment of the present invention, where (a) is a cross-sectional plan view and (b) is a longitudinal sectional view.

FIG. 2 is a system diagram of a condensing turbine type geothermal power plant.

FIG. 3 is a cross-sectional plan view showing the structure of a conventional jet condenser.

[Explanation of symbols]

 Reference Signs List 4 Jet condenser 6 Circulating water pump 7 Gas extractor 8 Condenser body 9 Partition partition 9a Middle partition 10 Condenser section 11 Gas cooling section 11A, 11B Classification 12 Sprinkler pipe 12A, 12B Sprinkler mother pipe 12b Spray nozzle 13A, 13B Inlet valve 14 Gas extraction valve

Claims (3)

(57) [Claims] 1. A jet-type condenser for a geothermal power plant, which straddles both a condenser section and a gas cooling section with respect to a condenser section in which a condenser section and a gas cooling section are defined. piping spray nozzle with sprinkling pipe, two circulating water pump connected to the bottom side of the hot well, and in those equipped with a gas cooling portion with a gas extractor, to divide the water spray pipe into two systems, the A jet condenser for a geothermal power plant , wherein a cooling water inlet valve is provided for each system . 2. A jet-type condenser according to claim 1, wherein the gas cooling section defined in the condenser body is divided into two sections, and one sprinkling pipe is accommodated for each section. A jet condenser for a geothermal power plant, wherein a gas extractor is connected via a gas extraction valve . 3. When one of the two circulating water pumps fails.
In addition, one cooling water inlet valve of the water sprinkler pipe divided into two systems, and the corresponding gas extraction valve of the gas cooling section section is closed,
The geothermal power according to claim 1, wherein the remaining one circulating water pump, the water sprinkling pipe of the system, and the gas extractor of the gas cooling section are continuously operated while the output of the steam turbine is halved. How to operate a jet condenser for a power plant.