阅读说明：本技术 一种射汽抽气装置 (Steam injection and air exhaust device ) 是由 张国洋 冯宾 钟德樑 楼滉 晁红伟 彭军华 蒋科震 胡轩 杨龙 艾民 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种射汽抽气装置,包括：抽气组件和汽封冷却器；抽气组件包括第一喷射器、第二喷射器、第一冷却器和第二冷却器；第一喷射器汽气入口连通汽轮机凝汽器汽侧出口,其汽气出口连通第一冷却器的汽气入口,第一冷却器的汽气出口连通第二喷射器的汽气入口,第二喷射器的汽气出口连通第二冷却器的汽气入口,第二冷却器的汽气出口连通汽封冷却器的汽气入口；气汽混合物被第一喷射器吸入经过压缩后排入第一冷却器；汽气混合物经过冷却后,空气和部分未凝结蒸汽再被第二喷射器吸入经过压缩后排入第二冷却器；经过再次冷却后,蒸汽被冷却成凝结水,空气则排入汽封冷却器换热器中继续冷却,凝汽效果突出,环保性能更好。(The invention discloses a steam-jetting air-extracting device, which comprises: an air extraction assembly and a gland seal cooler; the air extraction assembly comprises a first ejector, a second ejector, a first cooler and a second cooler; the steam-gas inlet of the first ejector is communicated with the steam-side outlet of the steam turbine condenser, the steam-gas outlet of the first ejector is communicated with the steam-gas inlet of the first cooler, the steam-gas outlet of the first cooler is communicated with the steam-gas inlet of the second ejector, the steam-gas outlet of the second ejector is communicated with the steam-gas inlet of the second cooler, and the steam-gas outlet of the second cooler is communicated with the steam-gas inlet of the steam seal cooler; the gas-steam mixture is sucked by the first ejector, compressed and discharged into the first cooler; after the steam-gas mixture is cooled, the air and part of uncondensed steam are sucked by the second ejector and are discharged into the second cooler after being compressed; after secondary cooling, the steam is cooled into condensed water, and the air is discharged into the heat exchanger of the steam seal cooler to be continuously cooled, so that the condensing effect is outstanding, and the environmental protection performance is better.)

1. An ejection air extraction device, comprising: an air extraction assembly and a gland seal cooler (5);

the air extraction assembly comprises a first ejector (1), a second ejector (2), a first cooler (3) and a second cooler (4); the steam inlet of the first ejector (1) is communicated with the steam side outlet of a steam turbine condenser, the steam outlet of the first ejector is communicated with the steam inlet of the first cooler (3), the steam outlet of the first cooler (3) is communicated with the steam inlet of the second ejector (2), the steam outlet of the second ejector (2) is communicated with the steam inlet of the second cooler (4), and the steam outlet of the second cooler (4) is communicated with the steam inlet of the steam seal cooler (5).

2. An injection and extraction device according to claim 1, wherein the first injector (1) comprises a first nozzle, a first mixing chamber and a first diffuser; the second ejector (2) comprises a second nozzle, a second mixing chamber and a second diffuser; steam turbine condenser's steam side export intercommunication first mixing chamber steam gas entry, first mixing chamber steam gas export intercommunication first nozzle steam gas entry, first nozzle steam gas export intercommunication first diffuser, the steam gas export intercommunication of diffuser the steam gas entry of first cooler (3), the steam gas export intercommunication of first cooler (3) the steam gas entry of second mixing chamber steam gas entry, the steam gas export intercommunication of second mixing chamber steam gas export intercommunication the steam gas entry of second nozzle, the steam gas export intercommunication of second nozzle steam gas export the second diffuser, the steam gas export intercommunication of second diffuser the steam gas entry of second cooler (4).

3. The steam injection and extraction device as claimed in claim 1, further comprising a steam seal injector (6) and a steam leakage pipeline, wherein a steam inlet of the steam seal injector (6) is communicated with the steam leakage pipeline and a steam inlet of the steam seal cooler (5), and the steam leakage pipeline is communicated with a shaft seal of the steam turbine for absorbing steam leakage.

4. The steam-injection air extraction device as claimed in claim 1, characterized in that the condensed water outlets of the first cooler (3), the second cooler (4) and the gland seal cooler (5) are communicated with a hot well of a drain condenser (8).

5. A steam jet extraction device as claimed in claim 3, characterised in that the cooling water inlets and outlets of the first cooler (3), the second cooler (4) and the gland seal cooler (5) are all in communication with the cooling water pipeline of the water pump cooling water system (7).

Technical Field

The invention relates to the technical field of air extraction devices, in particular to a steam injection air extraction device.

Background

In the existing air extraction device, an air steam mixture is sucked into a mixing chamber of a condenser by a first-stage steam injection air extractor, mixed with high-speed steam injected by a nozzle in the mixing chamber, enters a diffuser and is compressed and then discharged into a first cooler; after the steam-air mixture is cooled in the first cooler, the air and part of the steam which is not condensed are sucked by the steam ejector of the second stage, mixed with the high-speed steam ejected by the nozzle in the mixing chamber, enter the diffuser and are discharged into the second cooler after being compressed; after the steam-air mixture is cooled in the cooler, the steam is cooled to form condensed water, and the air is exhausted to the atmosphere.

In order to reduce the starting time of the vacuum system, a separate starting air extractor is arranged; the starting air extractor is a single-stage steam-jet air extractor without a cooler, and directly discharges all steam-air mixtures into the atmosphere during working.

Therefore, how to provide an air extractor with stable starting of a vacuum system is a problem to be solved by those skilled in the art.

Disclosure of Invention

The present invention solves at least to some extent one of the above-mentioned technical problems of the prior art.

In view of the above, the present invention is directed to a steam injection and extraction device, which has a higher efficiency of condensing steam-gas mixture and is more thorough through a first injector, a first cooler, a second injector, a second cooler and a gland sealing cooler connected in series, and can absorb steam leakage from a steam turbine shaft seal, enter the gland sealing cooler through a steam leakage pipeline, and condense the steam into water, so that the steam consumption of the starting air extractor is stable and suitable for long-time operation.

In order to achieve the purpose, the invention adopts the following technical scheme:

an injection extraction device comprising: an air extraction assembly and a gland seal cooler;

the extraction assembly comprises a first ejector, a second ejector, a first cooler and a second cooler; the steam inlet of the first ejector is communicated with the steam side outlet of a steam turbine condenser, the steam outlet of the first ejector is communicated with the steam inlet of the first cooler, the steam outlet of the first cooler is communicated with the steam inlet of the second ejector, the steam outlet of the second ejector is communicated with the steam inlet of the second cooler, and the steam outlet of the second cooler is communicated with the steam inlet of the steam seal cooler.

According to the technical scheme, compared with the prior art, the invention discloses the steam injection and extraction device, and the gas-steam mixture is sucked from the condenser by the first ejector, compressed and discharged into the first cooler; after the steam-air mixture is cooled in the first cooler, the air and part of uncondensed steam are sucked by the second ejector, compressed and discharged into the second cooler. After the steam-air mixture is cooled in the cooler, the steam is cooled into condensed water, and the air is discharged into the heat exchanger of the steam seal cooler to be continuously cooled, so that the condensing effect is remarkable, and the environmental protection performance is better.

Preferably, in the above-described steam injection and extraction device, the first injector includes a first nozzle, a first mixing chamber, and a first diffuser; the second injector comprises a second nozzle, a second mixing chamber and a second diffuser; steam turbine condenser's steam side export intercommunication first mixing chamber steam gas entry, first mixing chamber steam gas export intercommunication first nozzle steam gas entry, first nozzle steam gas export intercommunication first diffuser, the steam gas export intercommunication of diffuser the steam gas entry of first cooler, the steam gas export intercommunication of first cooler the steam gas entry of second mixing chamber, second mixing chamber steam gas export intercommunication the steam gas entry of second nozzle, the steam gas export intercommunication of second nozzle steam gas export the second diffuser, the steam gas export intercommunication of second diffuser the steam gas entry of second cooler.

Preferably, the steam injection and extraction device is further provided with a steam seal injector and a steam leakage pipeline, a steam inlet of the steam seal injector is communicated with the steam leakage pipeline and a steam inlet of the steam seal cooler, and the steam leakage pipeline is communicated with a shaft seal of the steam turbine and used for absorbing steam leakage.

Preferably, in the steam injection and extraction device, the condensed water outlets of the first cooler, the second cooler and the steam seal cooler are all communicated with a hot well of a drain condenser.

Preferably, in the above steam injection and extraction device, the cooling water inlets and the cooling water outlets of the first cooler, the second cooler and the steam seal cooler are all communicated with a cooling water pipeline of a water pump cooling water system.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic diagram provided by the present invention.

In the figure, the position of the upper end of the main shaft,

the system comprises a first ejector 1, a second ejector 2, a first cooler 3, a second cooler 4, a steam seal cooler 5, a steam seal cooler 6, a water pump cooling water system 7 and a drain condenser 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, unless otherwise specifically defined and limited, the terms "mounted," "connected," "communicated," "fixed," and the like are to be construed broadly, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

Referring to fig. 1, a steam-injecting and air-extracting device of the present invention includes:

an extraction assembly and a gland seal cooler 5;

the air extraction assembly comprises a first ejector 1, a second ejector 2, a first cooler 3 and a second cooler 4; the steam inlet of the first ejector 1 is communicated with the steam side outlet of the steam turbine condenser, the steam outlet of the first ejector is communicated with the steam inlet of the first cooler 3, the steam outlet of the first cooler 3 is communicated with the steam inlet of the second ejector 2, the steam outlet of the second ejector 2 is communicated with the steam inlet of the second cooler 4, and the steam outlet of the second cooler 4 is communicated with the steam inlet of the steam seal cooler 5.

In some embodiments of the invention, the first injector 1 comprises a first nozzle, a first mixing chamber and a first diffuser; the second injector 2 comprises a second nozzle, a second mixing chamber and a second diffuser; the steam side outlet of the steam turbine condenser is communicated with a steam inlet of a first mixing chamber, a steam outlet of the first mixing chamber is communicated with a steam inlet of a first nozzle, a steam outlet of the first nozzle is communicated with a first diffuser, a steam outlet of the diffuser is communicated with a steam inlet of a first cooler 3, a steam outlet of the first cooler 3 is communicated with a steam inlet of a second mixing chamber, a steam outlet of the second mixing chamber is communicated with a steam inlet of a second nozzle, a steam outlet of the second nozzle is communicated with a second diffuser, and a steam outlet of the second diffuser is communicated with a steam inlet of a second cooler 4.

In some embodiments of the present invention, a steam seal injector 6 and a steam leakage pipeline are further provided, wherein a steam inlet of the steam seal injector 6 is communicated with the steam leakage pipeline and a steam inlet of the steam seal cooler 5, and the steam leakage pipeline is communicated with a shaft seal of the steam turbine for absorbing steam leakage.

In some embodiments of the invention, the condensate outlets of the first cooler 3, the second cooler 4 and the gland cooler 5 are all communicated with the hot well of the drain condenser 8.

In some embodiments of the present invention, the cooling water inlets and cooling water outlets of the first cooler 3, the second cooler 4 and the gland cooler 5 are all in communication with the cooling water line of the water pump cooling water system 7.

Specifically, the operation principle of the invention is as follows:

the steam injection and air extraction device works along with the operation of the condenser when the steam turbine works normally;

the gas-steam mixture enters a first mixing chamber of a first ejector 1 from a condenser, and is compressed by a first diffuser and then discharged into a first cooler 3 together with the high-speed gas-steam mixture ejected by a first nozzle; after the steam-air mixture is cooled in the first cooler, the air and part of uncondensed steam enter the second mixing chamber, the high-speed steam ejected from the mixing chamber and the second nozzle enters the second diffuser 2, and the high-speed steam is compressed and discharged into the second cooler 4; after the steam-air mixture is cooled in the cooler, the steam is cooled into condensed water, and the air is discharged into the heat exchanger of the steam seal cooler to be cooled continuously;

steam from front and rear shaft seals of the steam turbine is sucked by the steam seal ejector 6 through a steam leakage pipeline, the leaked steam and the injected steam are mixed and then sprayed into the steam seal cooler for cooling, most of the steam is cooled, and the residual steam is not condensed and discharged to the atmosphere.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.