JPH04116306A - Water hammer preventive method of deaerator water piping and its piping equipment - Google Patents

Abstract

PURPOSE:To prevent a flash from occurring at the junction point of a condensate supply piping and a deaerator bypass piping by a method wherein a portion of the condensate which is supplied by a condensate pump is mixed into the condensate flowing along the deaerator bypass pipe. CONSTITUTION:At start-cup of a turbine apparatus, the condensate from a condenser 7 is sent to a deaerator 8 through a condensate supply piping 1 by a condensate pump 2, and on the other hand, a portion of the high-temperature condensate in the deaerator 8 is circulated through a deaerator circulation pipe 17 by a circulation pump 12. At this time, a pneumatic operation type piston valve 22 and a stop valve 23 is opened so that a portion of low-temperature condensate which flows out of the condenser 7 through the condensate supply piping 1 is mixed into high-temperature condensate, which flows along a deaerator bypass piping 15, via an injection piping 21 in order to reduce the temperature of the high-temperature condensate and to reduce the temperature of the mixed condensate to a saturation temperature equivalent to the pressure of condensate flowing along the condensate supply piping 1. As a result, a flash does not occur at the junction point of the deaerator bypass piping 15 and the condensate supply piping 1, resulting in preventing a water hammer from occurring.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention particularly relates to a turbine installation ωh that includes a boiler and a condensing turbine, in which condensate flows through a downcomer pipe connected to a deaerator and a boiler feed pump. A prevention method for preventing the occurrence of water hammer at this confluence section when a part of the condensate flows into the condensate supply piping that supplies condensate to the deaerator and returns it to the deaerator, and the piping therefor Regarding equipment.

(Prior art) In a turbine installation equipped with a boiler and a condensing turbine, the water supply system shown in Fig. 2 is one in which condensate from the condenser is deaerated by a deaerator and then supplied to the boiler. It has been known.

In FIG. 2, a condensate supply pipe 1 includes a condensate pump 2, a flow rate control valve 3. Electric valve 4. It is equipped with a low pressure heater 5 and a check valve 6 and connected to a condenser 7 and a deaerator 8, and the condensate supplied from the condenser 7 to the deaerator 8 is refluxed. Downpipe 9
extends downward Q from the deaerator 8 and is connected to the boiler feed pump 10, and the condensate degassed in the deaerator 8 is guided to the boiler feed pump 1o. Note that 11 is the boiler feed pump 10
This is a water supply pipe that feeds condensate that has been pressurized by water to a boiler (not shown).

It connects to the downcomer pipe 9 and the condensate supply pipe 1 downstream of the check valve 6, bypasses the deaerator 8, and supplies the circulation pump 12 with the check valve 13.
A deaerator bypass pipe 15 equipped with an electric valve 14 is provided, and a deaerator bypass pipe 15. The deaerator 8, the condensate supply pipe 1, and a part of the downcomer pipe 9 do not return part of the condensate flowing through the downcomer pipe 9 to the deaerator, forming a deaerator circulating water pipe]7.

In addition, a water supply pipe 18 is provided which branches from the deaerator high-bus pipe 5 at the outlet of the circulation pump 12 and supplies hot water for pumping the boiler water supply pump 1o. Note that] 9 is an electric valve.

With this configuration, the pressure of the condensate supply pipe 1 in the condenser 7 with the electric valve 4 open is increased by the condensate pump 2, and the flow rate is controlled by the Meteor control valve 3 to supply the deaerator. 8. At this time, when operating the turbine equipment, the GJ
After the condensate is heated by the low-pressure heater 5 through which air is extracted from the turbine, it is supplied to the deaerator 8, where it is heated and degassed by the oil and steam supplied to the deaerator 8. Since there is no oil vapor, the condensate is not heated by the low-pressure heater 5 and is supplied to the deaerator 8 at a low temperature. is evacuated and degassed. The degassed condensate flows in one direction through the downcomer pipe 9, is sent to the boiler feed pump 10, is pressurized by the boiler feed pump 1o, and is sent to the boiler via the water supply pipe 11.

By the way, turbine equipment is started and stopped frequently, for example, on a daily 5 tart
During DailyStop) operation, the turbine equipment
The temperature of the condensate in the deaerator 8 during JI does not drop much during operation. Therefore, when starting up the turbine equipment, high-temperature condensate in the deaerator 8 is circulated through the downcomer pipe 9 to the pump 12C.
By circulating and flowing the deaerator circulating water pipe 7 through the deaerator 8 with the electric valve 14 opened, the condensate supply pipe 1
The temperature of the condensate in the deaerator 8 and the condensate in the downcomer pipe 9 are equalized by supplying low-temperature condensate gas through the deaerator 8, which lowers the temperature.
I am trying to prevent Solanche from growing on downpipe 9.

[Problems to be Solved by the Invention] As described above, when the turbine equipment is started in the DSS operation, the temperature of the condensate in the deaerator 8 is close to the temperature during operation. Therefore, when the turbine equipment is started and vacuum deaeration is started, the condensate flowing through the condensate supply pipe 1 is transferred from the deaerator 8 to the downcomer pipe 9. The temperature of the condensate flowing through the deaerator bypass pipe 15 is high, and the internal pressure of the condensate supply pipe 1 approaches the internal pressure of the deaerator 8, entering the vacuum region. Solanche occurred at the junction with No. 15, and there was a problem that the air bubbles created by the flannel sea were crushed and water hammer was created.

An object of the present invention is to provide a method for preventing water hammer in a deaerator water supply piping and its piping equipment, which can prevent water hammer as described in 1-1 during startup of a turbine installation (11N).

[Means for Solving the Problems] According to the present invention, the above problems are solved by a condensate supply pipe that supplies condensate from a condenser to a deaerator using a condensate pump, and a deaerator in the deaerator. It is equipped with a precipitation pipe that leads the condensate to the boiler water supply pump, and a deaerator bypass pipe that high-passes the deaerator, is equipped with a circulation pump, and connects the condensate supply pipe and the precipitation pipe. In the method for preventing water hammer in the deaerator water supply piping, which prevents the occurrence of water hammer at the confluence of the condensate flowing through the piping and the condensate flowing through the deaerator bypass piping, The condensate supply piping of the condensate pump outlet I'' shall be mixed with the condensate flowing through the deaerator bypass pipe. A water injection pipe shall be provided which is connected to the deaerator bypass pipe at the outlet of the circulation pump and allows a portion of the condensate from the condenser to flow therethrough.

[Effect]

When the turbine equipment is started, a portion of the low-temperature condensate flowing through the condensate supply piping is transferred to the high-temperature condensate in the deaerator flowing through the deaerator bypass piping and to the condensate supply piping at the condensate pump outlet and the circulation pump. By sending and mixing water with a condensate pump through a water injection pipe connected to the deaerator bypass pipe at the outlet, the temperature of the high-temperature condensate flowing through the deaerator bypass pipe decreases, and the condensate The temperature drops to the saturation temperature, which corresponds to the internal pressure of the condensate flowing through the supply pipe. As a result, no flaring occurs at the confluence of the condensate flowing through the deaerator bypass piping and the condensate flowing through the condensate supply piping, resulting in 1. '72 - Tahamma does not occur.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a system diagram of a deaerator water supply piping equipped with A-tahammer prevention piping equipment according to an embodiment of the present invention. Note that the first
In the figure, parts that are the same as those in the conventional example shown in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted. In Fig. 1, the difference from the conventional example is that the condensate supply pipe 1 at the outlet of the condensate pump 2 is connected to the deaerator bypass pipe 15 downstream of the electric valve 14, which is the outlet of the circulation pump 12. A water injection pipe 21 equipped with a pneumatically operated screw I/N valve 22 and an I/M valve 23 is provided.

With this configuration, when starting up the turbine equipment, the condensate pump 2 sends condensate from the condenser 7 to the deaerator 8 via the condensate supply pipe 1, while the high-temperature condensate in the deaerator 8 A part of the water is circulated through the deaerator circulating water piping 17 by the circulation pump 12, but in this case, the pneumatically operated bis-in valve 22. Stop valve 2
3 is opened, a part of the low-temperature condensate flowing through the condensate supply pipe 1 from the condenser 7 is mixed with the high-temperature condensate flowing through the deaerator bypass pipe 15 via the water injection pipe 21, and its temperature is lowered. The mixed condensate is lowered to a saturation temperature corresponding to the internal pressure of the condensate flowing through the condensate supply pipe 1. As a result, no flash occurs at the junction of the deaerator bypass pipe 15 and the condensate supply pipe 1, and water hammer does not occur accordingly.

[Effects of the Invention] As is clear from the above description, according to the present invention, when the turbine equipment is started up, low-temperature water is supplied by the condensate pump to the high-temperature condensate flowing through the deaerator bypass piping from the deaerator. In addition, as piping equipment for this mixing, water injection piping is installed to connect the deaerator bypass piping and condensate supply piping, and the low-temperature condensate flowing through the condensate supply piping is connected to the water injection piping. By mixing with the high-temperature condensate flowing through the deaerator bypass pipe, the temperature of the high-temperature condensate flowing through the deaerator bypass pipe decreases until it reaches a saturation temperature corresponding to the internal pressure of the condensate flowing through the condensate supply pipe. Since the deaerator bypass pipe and the condensate supply pipe converge, it is possible to prevent the occurrence of flutters and bulges at the junction of the deaerator bypass pipe and the condensate supply pipe, thereby eliminating the need for a hammer hammer.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a deaerator water supply pipe equipped with a usuk hammer prevention piping system according to an embodiment of the present invention, and FIG. 2 is a system diagram of a conventional deaerator water supply pipe. 1. Condensate supply piping, 2: Condensate pump, 7. Condenser, 8
Deaerator, 9, Jinsui 11.10: Boiler feed pump, 12
・Circulation pump, 15: Deaerator bypass piping, 2]: Water injection piping.

Claims (1)

[Claims] 1) Condensate supply piping that supplies condensate from the condenser to the deaerator using a condensate pump, and precipitation piping that leads deaerated condensate in the deaerator to the boiler feed pump. and a deaerator bypass piping that bypasses the deaerator and is equipped with a circulation pump and connects to the condensate supply piping and the precipitation piping, and the condensate flowing through the condensate supply piping and flowing through the deaerator bypass piping. In a water hammer prevention method for deaerator water supply piping that prevents water hammer from occurring at the junction with condensate, a portion of the condensate supplied by the condensate pump is transferred to the condensate flowing through the deaerator bypass piping. A method for preventing water hammer in a deaerator water supply piping characterized by mixing. 2) A condensate supply pipe that supplies condensate from the condenser to the deaerator using a condensate pump, a precipitation pipe that leads the deaerated condensate in the deaerator to the boiler feed pump, and a deaerator. a deaerator bypass pipe that bypasses the condensate supply pipe and connects it to the condensate supply pipe and the precipitation pipe, and is equipped with a circulation pump; In water hammer prevention piping equipment for deaerator water supply piping, which prevents water hammer from occurring in Water hammer prevention piping equipment for deaerator water supply piping, characterized in that it is provided with water injection piping through which part of the condensed water from the deaerator flows.