JPH01203807A - Boiler drain recovering device - Google Patents

Abstract

PURPOSE:To recover the heat of boiler drain and to reduce the feed of supply water, by providing a stream recovery system to recover steam, generated by gas water separation by means of a blow tank, and drain recovery system to recover drain, produced by gas water separation, by means of the drum of a boiler device. CONSTITUTION:The bottom of a blow tank 2 in which boiler drain 1 is intro duced is connected to a drum 6 through a drain recovery system 3 in which a drain recovery pump 4 is located. The top side of the blow tank 2 is con nected to a deaerator 7 through a steam deaerator recovery system 5 in which a pressure escape valve 9 is located. In the blow tank 2, gas water separation is made on the boiler drain, and drain is temporarily stored in the blow tank 2. During normal operation, the boiler drain is boosted with the aid of a drum recovery pump 4 and is recovered by the drum 6 through the drain recovery system 4, and is recovered by the deaerator 7 through the steam deaerator recovery system 5. This constitution enables recovery of boiler drain discharged to the outside of a system during the daily starting of a boiler, and permits recovery of the heat of drain simultaneously with reduction of auxiliary feed water.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a boiler drain recovery device, and in particular to a drain suitable for recovering steam and generated drain from boiler drain and reducing the amount of boiler drain discharged outside the system. Regarding a collection device.

[Conventional technology]

Conventionally, the boiler drain discharge system when the boiler is started, etc., as shown in Fig. 3, discharges the boiler drain into a blow tank 31, and in this tank 31, the waste water is flushed under reduced pressure to separate steam and water, and the steam is transferred to the blow tank steam. The drain is discharged into the atmosphere through an atmospheric discharge system 37, and the drain is discharged into a drainage tank through a drainage system 32. In the blow tank 31, the opening degree of the valve 34 is adjusted based on the signal from the level measuring device 33 to control the amount of drain in the blow tank 31, and in the drainage system 32, the amount of drain in the blow tank 31 is controlled based on the signal from the temperature measuring device 36. The opening degree of the pulp 35 installed in the cooling water supply line is adjusted to control the temperature of the waste water discharged into the waste water tank.

[Problem to be solved by the invention]

However, in recent years, boiler equipment in thermal power plants is often operated in daily start-stop operation, and the boiler drain generated during daily startup is discharged, which not only wastes thermal energy but also discharges it as boiler drain. Makeup water is required to match the amount of boiler drain.

An object of the present invention is to provide a boiler drain recovery device that solves the problems of the prior art described above, recovers heat from the boiler drain during startup, etc., and can reduce makeup water.

[Means to solve the problem]

In order to achieve the above-mentioned object, the first aspect of the present invention is to collect steam obtained by steam separation in a blow tank with a deaerator, and to collect drain obtained by steam separation in the blow tank into a drum of a boiler device. The second aspect of the present invention is to collect the steam obtained by steam and water separation in the blow tank in the condenser, and to collect the drain obtained by steam and water separation in the blow tank to the drum of the boiler equipment. It was designed to be collected by

[Effect]

Condensate and steam flow into the blow tank when the boiler is started, and within the blow tank, the condensate self-evaporates to generate steam, and the inflow steam flows into the blow tank as steam.

While controlling the pressure in the blow tank, the steam obtained from the air and water separation in the blow tank is recovered in a deaerator or condenser, and the drain obtained from the air and water separation in the blow tank is recovered in the drum of the boiler equipment. Then, the condensate is not discharged outside the system, the amount of make-up water is reduced, and the heat of the condensate can be recovered.

〔Example〕

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

FIG. 1 is a system diagram showing an embodiment of the boiler drain recovery device of the present invention.

In FIG. 1, the bottom of a blow tank 2 into which a boiler drain 1 is introduced is connected to a drum 6 via a drain recovery system 3 in which a drain recovery pump 4 is interposed.

Further, the top side of the blow tank 2 is connected to a deaerator 7 via a steam deaerator recovery system 5 in which a pressure relief valve 9 is provided. The pressure relief valve 9 is operated based on a signal from a pressure measuring device 8 that measures the pressure inside the blow tank 2.

The operation of the boiler drain recovery device having the above configuration will be explained.

When starting up the boiler, boiler drain 1 from the drum 6 of the boiler is introduced into the blow tank 2. For boilers with daily start-stop operation, boiler drain 1
Since this is especially high-pressure saturated water, when it is introduced into the blow tank 2, it is reduced to a predetermined pressure by a pressure regulating device consisting of a pressure measuring device 8, a pressure relief valve 9, etc., and self-evaporates. Furthermore, during the boiler startup process, steam that has entered the boiler drain also flows into the blow tank 2.

In the blow tank 2, the boiler drain is separated into steam and water, and the drain is temporarily stored in the blow tank 2. During normal operation, the pressure is increased by the drum recovery pump 4, and the drain is recovered by the drum 6 via the drain recovery system 4, and the steam is It is recovered in a deaerator 7 via a steam deaerator recovery system 5.

In this way, in the case of a daily start-stop operation plant, the boiler condensate that is discharged outside the system during daily boiler startup can be recovered, reducing makeup water and recovering heat from the condensate.

FIG. 2 is a system diagram showing another embodiment of the boiler drain recovery device of the present invention.

The device shown in FIG. 2 is a boiler drain recovery device in an exhaust heat recovery boiler in a combine plant of a gas turbine or a steam turbine.

In Figure 2, drum-blown water (boiler drain) from the high-pressure drum and low-pressure drum in the exhaust heat recovery boiler is shown.
1 is introduced into the blow tank 2. The steam generated by steam separation in the blow tank 2 is collected in the condenser 11, and the drain is temporarily stored in the blow tank 2, and during normal operation, the pressure is increased by the drain recovery pump 4 and collected in the low pressure drum 10. It looks like this.

In the embodiment shown in FIG. 2 as well, steam recovery and condensate recovery can be performed, making it possible to reduce make-up water and recover heat from condensate.

[Effects] As described above, according to the present invention, the steam and condensate generated in the blow tank during startup can be recovered, and the above-mentioned effects are particularly noticeable in plants that operate daily start-stop. It is possible to reduce drain and steam to be discharged, reduce make-up water (pure water) to the boiler, and reduce heat loss of drain.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one embodiment of the boiler drain recovery device of the present invention, FIG. 2 is a system diagram showing another embodiment of the boiler drain recovery device of the present invention, and FIG. 3 is a conventional boiler drain discharge system diagram. be. l...Boiler drain, 2...Blow tank, 3...Drain recovery system, 5...
Steam deaerator recovery system (steam condenser recovery system), 6...
...Drum, 7...Deaerator, 8...
Pressure measuring device, 9...Pressure relief valve, 10...
...Low pressure drum, 11...Condenser. Agent: Patent Attorney Masaru Nishimoto - Figure 1 Figure 2

Claims (2)

[Claims] (1) A steam recovery system that uses a deaerator to recover the steam obtained by steam separation in the blow tank where the boiler drain is introduced, and a boiler system that collects the steam obtained by the separation of water in the blow tank where the boiler drain is introduced. A boiler drain recovery device characterized by comprising a drain recovery system for recovering the drain with a drum. (2) A steam recovery system that uses a condenser to recover the steam obtained by steam separation in the blow tank where the boiler drain is introduced, and a boiler system that uses the condenser to recover the steam obtained by the steam separation in the blow tank where the boiler drain is introduced. A boiler drain recovery device characterized by comprising a drain recovery system for recovering the drain with a drum.