JPS6267208A - Process steam feed device - Google Patents

Abstract

PURPOSE:To make good use of energy by providing a steam ejector which utilizes steam branched from the halfway of a steam feed pipe to a steam turbine as drive steam, and also utilizes low pressure bleed steam from the steam turbine as intake, so as to feed steam to a process. CONSTITUTION:A pipe line 12 which is branched from the halfway of a steam feed pipe 10 between a boiler 1 and a turbine 5, is provided so as to be communicated with a drive steam inlet port 2a of a steam ejector 2 by way of as top valve 10a, and a bleed port 2b of the steam ejector 2 is connected with a process 4 by way of a desuperheater 3 of a water injection system. And a bleed port 5c of the steam turbine 5 is connected with a suction port 2c of the steam ejector 2 by a pipe line 14 equipped with a stop valve 14a. As this configuration allows drive steam from the ejector 2 mixed with intake steam to be regulated to the pressure required by the process 4 so as to be fed to the process 4, generated steam energy can be effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a process steam supply device that supplies steam to a process by reducing the pressure and temperature of steam from a steam supply source to a steam turbine.

[Prior art and its problems]

The steam required by processes in the process industry is supplied by conventional steam sources, such as boilers, which take high pressure and high temperature steam and reduce the pressure and temperature to the steam conditions required by the process.

As a means for this purpose, it is known to use a single valve having the function of reducing the pressure and temperature of high-pressure, high-temperature steam from a steam generation source, using nine steam conversion valves, or a combination of a pressure reducing valve and a temperature reducing device.

However, the above-mentioned means simply reduce the pressure and temperature of the high-pressure, high-temperature steam to match the steam conditions required by the process, so energy is not used effectively. From these points of view, it is necessary to consider how to use the energy more effectively in the process of reducing the pressure and temperature of high-pressure, high-temperature steam.

[Purpose of the invention]

In view of the above-mentioned points, it is an object of the present invention to provide a process steam supply device that supplies steam to a process that satisfies the requirements of the process by depressurizing and temperature reducing the steam while effectively utilizing high-pressure and high-temperature steam energy. purpose.

[Summary of the invention]

According to the present invention, the pipes branched from the middle of the steam transmission pipe of the steam turbine, or the pipes connected to the high-pressure stage bleed air 1 of the steam turbine, are connected to each other through valves to provide steam at least one steam ejector having one pipe line communicating with the drive steam inlet of the ejector; and the suction port of the steam ejector connected via a valve to a bleed port at a pressure stage lower than the oil port. It is composed of a conduit that is
This is achieved by mixing the driving steam of the steam ejector with the bleed gas of the low pressure stage to supply steam to the process.

[Embodiments of the invention]

The present invention will be described in detail below based on the drawings.

FIG. 1 is a system diagram of a process steam supply system according to an embodiment of the present invention, in which a process supply steam pipe is provided branching off from a steam supply pipe from a steam generation source to a steam turbine. In FIG. 1, reference numeral 1 denotes a steam generation source, and a pipe line 10 for supplying steam from the boiler 1 to the turbine 5.
are communicating.

In addition, a pipe lN branches from the middle of the pipe w110 and communicates with the drive steam inlet 2a of the steam ejector 2 via the stop valve 10a.
112 is provided, and the exhaust port 2b of the steam ejector 2
is connected to the process 4 by a pipe line 11 via a water injection type attemperator 3. And the pipe line 10 is the steam turbine 5
It is connected to the steam port 5a and communicates with the boiler 1. An exhaust pipe N113 is connected to the exhaust port 5b. Further, the extraction port 5C of the steam turbine 5 is connected to the suction port 2C of the steam ejector 2 through a pipe 4 equipped with a stop valve 14a.

Next, a description will be given of the flow of steam that reduces the pressure and temperature of high-pressure and high-temperature steam from the boiler 1 and supplies the steam to the process number using the above-described configuration.

High-pressure, high-temperature steam from the boiler 1 is sent as driving steam through the pipe 12 from the driving steam port 2a to the steam ejector 2 by opening the stop valve 10a. This driving steam is injected through nine nozzles provided in the steam ejector 2 to increase the flow velocity, and the static pressure is lowered as well as the extraction pressure of the steam turbine 5, which will be described later. On the other hand, high-pressure and high-temperature steam from the boiler passes through the pipe 10 and is sent from the steam port 5a to the steam turbine 5, where it does work in the turbine, rotates the turbine axle connected to the generator 6, and generates a generator. 6 to generate electricity. This amount of electricity is normally required from the process side, and high-pressure, high-temperature steam corresponding to this amount is sent directly from the boiler 1 to the steam turbine.

In this case, the extracted air from the steam turbine b is reduced in pressure and temperature from the high pressure and high temperature steam sent to the steam turbine 5, and is
More *b is issued.

By the way, as mentioned above, the static pressure of the flow of high-speed driving steam passing through the nozzle of the steam ejector 2 is lower than the bleed air pressure, so if the stop valve 14a is opened, the bleed air flows through the pipe 1.
4, is sucked into the steam ejector 2 through the suction port 2C, and merges with the driving steam to become 1 steam. This mixed steam is adjusted to a pressure required by the process efficiency by the diffuser of the steam ejector 2, and is discharged from the exhaust port 2b and supplied to the process 4.

Note that if the temperature of the mixed steam is higher than the required temperature for the process 4, it is possible to adjust the temperature in the water injection type attemperator 3 and supply it to the process 4.

As is clear from the above explanation, high-pressure, high-temperature steam from the steam generation source is supplied to the steam turbine to generate electricity, and a portion of the steam from the generation source is sent as driving steam to the steam ejector to drive it. By sucking the extracted air or exhaust gas from the steam turbine into the steam ejector, mixing it with the ejector driving steam, and then supplying it to the process, the generated steam energy can be used effectively without waste, and a large amount of resources can be consumed. It is possible. Note that in another embodiment (not shown) of the present invention, high-pressure, high-temperature steam is taken out from the boiler 2, but instead of being directly supplied, the steam is taken out from the steam turbine at a pressure higher than the extraction pressure taken into the steam ejector. Even if the oil vapor is used as driving steam for the steam ejector, the operation is the same as described above.

〔Effect of the invention〕

Therefore, high-pressure, high-temperature steam from the boiler is used for power generation.
In the case of conventional equipment that is supplied through a separate route from the steam used for the process, the steam supplied to the process has to be depressurized and cooled before being sent to the seventh steam, resulting in a loss of energy due to the depressurization and temperature reduction. Of course, as in the present invention, by using high-pressure, high-temperature steam to generate electricity through a turbine and then using the extracted air as process steam, only 90% of the air can be used to generate electricity. This makes it possible to effectively utilize the available amount of generated steam.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a process steam supply device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Boiler as a steam supply source, 2... Steam ejector, 2a... Drive steam inlet, 2b... #Air port, 2
a...Intake port, No....Process, 5...Steam turbine, δC...Extraction port, No., 11.12.14...
・Pipeline.

Claims (1)

[Claims] In a process steam supply device in which a steam turbine and a process located in parallel are supplied from one steam generation source through separate pipes, the system is driven by high-pressure steam from the steam supply source or by this steam supply source. 1. A process steam supply system comprising: a steam ejector which uses high-pressure extracted air from a steam turbine as driving steam and low-pressure extracted air from the steam turbine as suction steam, and supplies output steam of the steam ejector to a process.