CN210565389U

CN210565389U - Water-jet air extractor

Info

Publication number: CN210565389U
Application number: CN201921520496.XU
Authority: CN
Inventors: 穆道江; 穆思宇; 董红慧
Original assignee: Lianyungang Yutai Electric Power Equipment Co ltd
Current assignee: Lianyungang Yutai Electric Power Equipment Co ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-05-19
Anticipated expiration: 2029-09-09

Abstract

The utility model provides a water jet air ejector, including the steam extraction room, be equipped with the extraction steam mouth on the steam extraction room, locate to install the admission cooling tube at the extraction steam mouth, have a plurality of steam extraction pipes at the internally mounted of admission cooling tube, install the inlet tube at the end of intaking of steam extraction room, install into water injection nozzle in the inside one side that is close to the inlet tube of steam extraction room, install the choke at the outlet end of steam extraction room, the choke is equipped with out water cooling jacket including hole enlargement section and straight tube section at the choke overcoat, installs the excess speed steam extraction room at the exit end of choke, the exit end of choke extends to the inside of excess speed steam extraction room, is equipped with the excess speed steam extraction pipe on the outer wall of excess speed steam extraction room. The utility model has the advantages of simple and reasonable structure, utilize the temperature that admission cooling tube and play water cooling chamber reduce equipment, solved and penetrated water ejector working water temperature in the circulation injection work and uprise to the problem of the evacuation ability of influence water ejector.

Description

Water-jet air extractor

Technical Field

The utility model relates to an electric power auxiliary engine technical field, more specifically say, relate to a penetrate water aspirator.

Background

Condensing steam turbines are typical steam turbines widely used in modern thermal power stations and nuclear power plants. The condenser is an important component of the turbine plant, and the establishment and the maintenance of vacuum of the condenser are indispensable conditions for the turbine to rush, which are important factors directly influencing the economy and the safety of the turbine plant. At the initial stage of the start-up of the steam turbine set, when the boiler ignition steam turbine enters the steam heating machine, a large amount of steam will rush into the condenser, and if a certain vacuum environment is not established in the condenser at this moment, the steam will form a positive pressure environment in the condenser after entering the condenser, and damage is caused to equipment. During the normal operation of the unit, the interior of the condenser also needs to be kept in a certain vacuum state. However, due to the imprecise pipelines and casings, air leaks in, so that the vacuum of the condenser is damaged, and the safe and economic operation of the steam turbine is endangered. Meanwhile, the partial pressure of air in the condenser is increased, so that the dissolved oxygen of condensed water is increased, and the corrosion to thermal equipment and pipelines is aggravated. The existence of air also increases heat transfer resistance in the condenser, influences the cooling of the exhaust steam of the steam turbine by the circulating cooling water, and increases the service power consumption. Therefore, when the condenser is operated, air therein must be continuously drawn out to maintain a vacuum. The water jet air ejector in the prior art has low steam extraction efficiency when in use, the water temperature can be increased in the circulating injection work, and the water temperature is increased to influence the vacuumizing capacity of the water jet air ejector, thereby influencing the operation capacity of the condenser.

Disclosure of Invention

The utility model aims to solve the technical problem that to prior art not enough, provide a simple structure is reasonable, the good water ejector of cooling effect, concrete scheme as follows:

the utility model relates to a water jet air ejector, its characteristics are: the steam extraction device comprises a steam extraction chamber, wherein a steam extraction port is arranged on the steam extraction chamber, a steam inlet cooling pipe is arranged at the steam extraction port, a steam inlet cooling water inlet pipe and a steam inlet cooling water outlet pipe which are communicated with the steam inlet cooling pipe are arranged on the outer wall of the steam inlet cooling pipe, a plurality of steam extraction pipes are arranged in the steam inlet cooling pipe, and the axial directions of the steam extraction pipes are parallel to the axial direction of the steam inlet cooling pipe; the steam extraction device comprises a steam extraction chamber, a water inlet pipe, a water inlet spray nozzle, a throat pipe, a water outlet cooling sleeve, a water outlet cooling chamber, a water outlet cooling water inlet, a water outlet cooling water outlet, an excess speed steam extraction chamber and an excess speed steam extraction chamber, wherein the water inlet end of the steam extraction chamber is provided with the water inlet pipe, one side, close to the water inlet pipe, of the inner part of the steam extraction chamber is provided with the water inlet spray nozzle, the water outlet spray nozzle is arranged at the water outlet end of the steam extraction chamber, the throat pipe comprises an expanding section matched with the water inlet spray nozzle and a straight pipe section connected with the expanding section, the throat pipe is sleeved with the water outlet cooling sleeve, the water outlet cooling water outlet is arranged at the other end of the water outlet cooling sleeve, the excess speed steam extraction chamber is arranged at the outlet end of the throat pipe, the outlet end of the throat pipe extends to the interior of the excess speed steam extraction chamber, the end, far.

The technical problem to be solved by the utility model can be further realized by the following technical proposal that the steam inlet cooling water inlet pipe is arranged at one end of the steam inlet cooling pipe far away from the steam extraction chamber; and the steam inlet cooling water outlet pipe is arranged at one end of the steam inlet cooling pipe close to the steam extraction chamber.

The technical problem to be solved by the utility model can be further realized by the following technical proposal, wherein the water outlet cooling water inlet is arranged at one end of the water outlet cooling sleeve close to the steam extraction chamber; and the water outlet cooling water outlet is arranged at one end of the water outlet cooling sleeve far away from the steam extraction chamber.

The utility model discloses the technical problem that will solve can also further realize through following technical scheme, installs the automatic check valve that prevents water and air backflow into the condenser between extraction pipe and extraction chamber.

Compared with the prior art, the beneficial effects of the utility model are that: the steam jet ejector has the advantages that the structure is simple and reasonable, the temperature of equipment is reduced by utilizing the steam inlet cooling pipe and the water outlet cooling chamber, the problem that the water temperature of working water of the water jet ejector is increased in the circulating injection work, so that the vacuumizing capacity of the water jet ejector is influenced is solved, the damage of high-temperature steam to the equipment can be effectively prevented, and the long-time normal operation of a unit is ensured; the automatic check valve installed at the steam extraction opening is used for preventing water and air from flowing back into the condenser when the water injection pump fails.

Drawings

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

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the water jet air extractor provided in this embodiment includes an air extracting chamber 8, an air extracting port is provided on the air extracting chamber, an air inlet cooling pipe 2 is installed at the air extracting port, an air inlet cooling water inlet pipe 1 and an air inlet cooling water outlet pipe 4 which are communicated with the air inlet cooling pipe are provided on an outer wall of the air inlet cooling pipe, a plurality of air extracting pipes 3 are installed inside the air inlet cooling pipe, and an axial direction of the air extracting pipe is parallel to an axial direction of the air inlet cooling pipe; a water inlet pipe 6 is arranged at the water inlet end of the steam extraction chamber, a water inlet spray nozzle 7 matched with the water inlet pipe is arranged at one side of the interior of the steam extraction chamber close to the water inlet pipe, a throat is arranged at the water outlet end of the steam extraction chamber, the throat comprises an expanding section 9 matched with the water inlet spray nozzle and a straight pipe section 12 connected with the expanding section, the outer sleeve of the throat pipe is provided with a water outlet cooling sleeve 11, a water outlet cooling chamber is formed between the inner wall of the water outlet cooling sleeve and the outer wall of the throat pipe, one end of the water outlet cooling sleeve is provided with a water outlet cooling water inlet 10, the other end of the water outlet cooling sleeve is provided with a water outlet cooling water outlet 13, an excess speed steam extraction chamber 15 is arranged at the outlet end of the throat pipe, the outlet end of the throat pipe extends to the interior of the excess speed steam extraction chamber, and one end of the excess speed steam extraction chamber, which is far away from the throat pipe, is provided with a water outlet 16, and the outer wall of the excess speed steam extraction chamber is provided with an excess speed steam extraction pipe 14 communicated with the excess speed steam extraction chamber. The pipe diameter of the pipe orifice of the diameter expansion section 9 of the throat pipe is larger than the diameter of the water inlet spray nozzle 7, so that the phenomenon that the air suction effect is influenced by the impact of the sprayed water column on the side wall of the air suction chamber around the throat pipe is avoided. The axis of the water inlet spray nozzle 7 is coincident with the axis of the throat pipe.

When the device works, firstly, cooling water is introduced into the steam inlet cooling water inlet pipe 1 and the water outlet cooling water inlet 10, then working water is introduced into the water inlet pipe 6, the working water is sprayed out from the water inlet spray nozzle 7 at a certain speed, the air pressure near the continuously high-speed sprayed working water is reduced along with the increase of the water flow movement speed, high vacuum is formed in the steam extraction chamber 8, then the steam extraction pipe 3 is connected with a condenser, steam in the condenser is cooled by the cooling water in the steam inlet cooling pipe 2 and then is sucked into the steam extraction chamber 8 to be mixed with the working water, the temperature of the working water is increased, the steam enters the residual steam extraction chamber 15 for further steam extraction after being subjected to pressure expansion by the throat pipe and cooled by the cooling water in the water outlet cooling chamber, and finally the steam is discharged from the water outlet along with the working water under the condition that the.

The steam inlet cooling water inlet pipe 1 is arranged at one end of the steam inlet cooling pipe 2 far away from the steam extraction chamber 8; the steam inlet cooling water outlet pipe 4 is arranged at one end of the steam inlet cooling pipe 2 close to the steam extraction chamber 8. The outlet cooling water inlet 10 is arranged at one end of the outlet cooling sleeve close to the steam extraction chamber 8; and the outlet water cooling water outlet 13 is arranged at one end of the outlet water cooling sleeve far away from the steam extraction chamber 8. An automatic one-way valve 5 for preventing water and air from flowing back into the condenser is arranged between the steam extraction pipe and the steam extraction chamber, and the automatic one-way valve ensures that gas enters the working chamber from the air inlet in one way, so that when the water injection pump breaks down, water and air are prevented from flowing back into the condenser.

Claims

1. A water jet air ejector is characterized in that: the steam extraction device comprises a steam extraction chamber (8), wherein a steam extraction opening is formed in the steam extraction chamber, a steam inlet cooling pipe (2) is arranged at the steam extraction opening, a steam inlet cooling water inlet pipe (1) and a steam inlet cooling water outlet pipe (4) which are communicated with the steam inlet cooling pipe are arranged on the outer wall of the steam inlet cooling pipe, a plurality of steam extraction pipes (3) are arranged in the steam inlet cooling pipe, and the axis direction of the steam extraction pipes is parallel to the axis direction of the steam inlet cooling pipe; a water inlet pipe (6) is arranged at the water inlet end of the steam extraction chamber, a water inlet spray nozzle (7) matched with the water inlet pipe is arranged at one side of the interior of the steam extraction chamber, which is close to the water inlet pipe, a throat is arranged at the water outlet end of the steam extraction chamber, the throat comprises an expanding section (9) matched with the water inlet spray nozzle and a straight pipe section (12) connected with the expanding section, a water outlet cooling sleeve (11) is sleeved outside the throat pipe, a water outlet cooling chamber is formed between the inner wall of the water outlet cooling sleeve and the outer wall of the throat pipe, one end of the water outlet cooling sleeve is provided with a water outlet cooling water inlet (10), the other end of the water outlet cooling sleeve is provided with a water outlet cooling water outlet (13), an excess speed steam extraction chamber (15) is arranged at the outlet end of the throat pipe, the outlet end of the throat pipe extends into the excess speed steam extraction chamber, a water outlet (16) is arranged at one end of the excess speed steam extraction chamber far away from the throat pipe, an excess speed steam extraction pipe (14) communicated with the excess speed steam extraction chamber is arranged on the outer wall of the excess speed steam extraction chamber.

2. The water jet air extractor of claim 1, wherein: the steam inlet cooling water inlet pipe (1) is arranged at one end of the steam inlet cooling pipe (2) far away from the steam extraction chamber; and the steam inlet cooling water outlet pipe (4) is arranged at one end of the steam inlet cooling pipe (2) close to the steam extraction chamber.

3. The water jet air extractor of claim 1, wherein: the outlet cooling water inlet (10) is arranged at one end of the outlet cooling sleeve close to the steam extraction chamber; and the water outlet cooling water outlet (13) is arranged at one end of the water outlet cooling sleeve far away from the steam extraction chamber.

4. The water jet air extractor of claim 1, wherein: an automatic one-way valve (5) for preventing water and air from flowing back into the condenser is arranged between the steam extraction pipe and the steam extraction chamber.