CN205558989U - Small steam turbine steam extraction access system - Google Patents

Abstract

A small steam turbine exhaust steam connection system, including a main steam turbine, a main steam turbine condenser, and a small steam turbine. The small steam turbine exhaust steam is connected to the throat opening of the main steam turbine condenser, and the small steam turbine exhaust steam flow and the vertical normal It is discharged into the condenser at a certain angle, and the protective parts are arranged above the inner tube bundle. The protective parts are arranged symmetrically on the left and right inside the condenser, and are respectively located above the tube bundles on the left and right sides inside the condenser. The protective parts use holes of a certain thickness. Composed of plates or solid bars with a certain diameter, the existing systems of the power plant can be rationally used to achieve energy saving and consumption reduction in the power plant. The system is simple, easy to construct, and easy to implement.

Description

A small steam turbine exhaust steam connection system

technical field

The utility model relates to the field of reconstruction of condenser equipment of a wet-cooling thermal power generating set, in particular to a steam-driven feed water pump changed from an electric feed pump of a wet-cooling thermal power generating set to a steam-driven feed water pump or a small steam turbine exhaust steam connection system in a newly added small steam turbine generator project.

Background technique

At present, some power plants have changed electric feed water pumps to steam driven feed water pumps in order to save power consumption. Therefore, due to the application of small steam turbines, a new problem has arisen - where does the exhaust steam of small steam turbines go. Simply configuring a dedicated condenser for a small steam turbine is not only costly, but also difficult to implement because the system is too complex, involves too many areas, and is limited by site space, circulating water volume, and other factors.

Utility model content

The purpose of the utility model is to provide a system for connecting exhaust steam of a small steam turbine to the condenser of the main steam turbine by rationally utilizing the existing system of the power plant, so as to realize energy saving and consumption reduction of the power plant.

In order to achieve the above purpose, the technical solution of this utility model is: a small steam turbine exhaust steam connection system, including the main steam turbine, the main steam turbine condenser, the small steam turbine, the main steam turbine exhaust steam is connected to the main steam turbine condenser, the small steam turbine exhaust The steam is also connected to the condenser of the main steam turbine; it is characterized in that the exhaust steam of the small steam turbine is connected to the throat opening of the condenser of the main steam turbine, and the inlet pipeline of the exhaust steam of the small steam turbine has a certain angle with the vertical normal line into the condenser.

Further, protective components are arranged above the inner tube bundles of the condenser, and the protective components are arranged symmetrically on the left and right inside the condenser, and are respectively located above the tube bundles on the left and right sides inside the condenser.

Furthermore, the protective component is in the shape of a plate, one end of which is arranged inside the side wall of the condenser shell, and the other end exceeds the width of the single-side tube bundle inside the condenser, forming a downward-sloping flow guide structure.

Furthermore, the protective part is formed by a certain thickness of the hole plate or a certain diameter of the solid bar, when using the solid bar, it can be made of round steel arranged in parallel and at intervals.

Further, the inlet pipeline of the exhaust steam flow of the small steam turbine is connected to the condenser at an angle of 45° with the vertical normal line.

Further, when the access pipeline of the exhaust steam flow of the small steam turbine is connected to the condenser in a horizontal manner, a louvered steam baffle is installed at the throat opening of the condenser, and the steam baffle and the vertical normal have a 45° clip horn.

Through the technical scheme of connecting the exhaust steam of the small steam turbine to the condenser of the main steam turbine, the utility model can rationally utilize the existing system of the power plant to realize energy saving and consumption reduction of the power plant. The system is simple, easy to construct and easy to realize.

Description of drawings

Fig. 1 is a schematic diagram of the exhaust steam connection system of a small steam turbine;

Fig. 2 Schematic diagram of the second exhaust steam connection system of the small steam turbine;

Figure 3 Schematic diagram of the structure of protective components

Figure 4 Schematic diagram of the second structure of protective components

1 Condenser throat, 2 Protective parts, 3 Heat exchange tubes, 4 Access pipes

detailed description

The utility model will be further described below in conjunction with the accompanying drawings. It should be understood that the content described here is only for illustrating and explaining the utility model, and is not intended to limit the utility model.

During the reconstruction of the power plant system, a small steam turbine is added to the original power plant system, and the exhaust steam of the small steam turbine is connected to the condenser of the main steam turbine. The following method steps are required:

1. Calculate the influence of the exhaust steam volume of the small steam turbine on the cooling capacity of the main steam turbine condenser. It is necessary to carry out accounting for various working conditions, such as TMCR working condition, TRL working condition, WVO working condition, THA working condition, etc.

2. Selection of access location. It can only be connected at the throat of the condenser. Redirection or displacement of piping or other components affecting access.

3. Access port selection. When the exhaust steam of the small steam turbine enters the condenser of the large steam turbine, the flow rate must meet the standard requirements as much as possible, which is guaranteed by the cross-section of the inlet. The entrance cross-sectional area should be large enough. The entrance can be circular, square, or trapezoidal, based on the principle of convenient on-site access. In order to achieve smooth access, it needs to change from square to circle or from circle to square (or trapezoid). For square (or trapezoidal) fittings, internal support must be done.

4. The direction in which steam flows into the condenser of the main steam turbine. It is advisable to discharge into the condenser at a downward angle of 45° (with the vertical normal line), so as to prevent the exhaust steam flow of the small steam turbine from interfering with the exhaust steam flow of the main steam turbine. The steam flow can be organized at a 45° angle by installing a louvered steam baffle at the inlet. The blinds need to be provided with stiffeners.

5. Protect the condenser tube bundle of the main steam turbine. A certain thickness of orifice plate or solid bar is added to the upper part of the condenser tube bundle to prevent the steam flow from scouring the tube bundle.

6. The internal support truss of the main steam turbine condenser needs to be adjusted. After the throat of the condenser is opened, the internal support truss cannot take root, and the hollow pipe section can be welded as the rooting point to maintain the original rigidity and strength of the condenser.

As shown in Figure 1, the exhaust steam of the small steam turbine is connected to the throat opening of the condenser, and the exhaust steam flow of the small steam turbine is discharged into the condenser at a downward angle of 45° (and the angle between the vertical normal line) through the connecting pipeline. , add protective parts above the heat exchange tube bundle inside the condenser. The protective parts are made of orifice plates or solid bars with a certain thickness. The protective parts are arranged symmetrically on the left and right inside the condenser. The side tube bundle is square, and the protective part is in the shape of a plate, one end of which is set on the inner side of the condenser wall, and the other end exceeds the width of the single-side tube bundle inside the condenser, and forms a downward-sloping diversion structure, which is more conducive to the flow from the condenser. Throat entry of main turbine exhaust steam flow.

As shown in Figure 2, for the space environment that does not have the access pipeline arranged at a downward angle of 45°, other suitable layout methods can be adopted, such as horizontally setting the access pipeline, and at this time, it is installed at the inner inlet of the condenser The louvered deflector set at 45° downward organizes the steam flow connected to the small steam turbine to flow in at an angle of 45°.

As shown in Figure 3 and Figure 4, the protective parts are made of orifice plates with a certain thickness or solid bars with a certain diameter. When solid bars are used, round steel can be used to arrange them in parallel and at intervals.

Finally, it should be noted that: the above is only an explanation of the utility model, and is not intended to limit the utility model. Although the utility model has been described in detail, for those skilled in the art, it can still understand the aforementioned Modifications to the technical solutions recorded, or equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (6)

1. A small steam turbine exhaust steam connection system, comprising a main steam turbine, a main steam turbine condenser, and a small steam turbine, the main steam turbine exhaust is connected to the main steam turbine condenser, and the small steam turbine exhaust is also connected to the main steam turbine condenser; It is characterized in that the exhaust steam of the small steam turbine is connected to the throat opening of the condenser of the main steam turbine, and the exhaust steam flow of the small steam turbine is discharged into the condenser at a certain angle with the vertical normal line. 2. The exhaust steam access system of a small steam turbine according to claim 1, characterized in that a protective component is provided above the inner tube bundle of the condenser, and the protective components are arranged symmetrically on the left and right inside the condenser, respectively located at the condenser Above the tube bundles on the left and right sides inside the device. 3. The exhaust steam access system of a small steam turbine according to claim 2, characterized in that the protective component is in the shape of a plate, one end of which is arranged inside the side wall of the condenser shell, and the other end exceeds the inner tube bundle of one side of the condenser width and form a downward-sloping diversion structure. 4. The exhaust steam access system of a small steam turbine according to claim 2, characterized in that the protective part is made of an orifice plate with a certain thickness or a solid bar with a certain diameter. When using a solid bar, it can be made of round steel. Arranged in parallel at intervals. 5. The exhaust steam access system of a small steam turbine according to claim 1, characterized in that the access pipeline of the exhaust steam flow of the small steam turbine is connected to the condenser at an angle of 45° with the vertical normal line. 6. The exhaust steam access system of a small steam turbine according to claim 1, characterized in that, when the access pipeline of the exhaust steam flow of a small steam turbine is connected to the condenser in a horizontal manner, at the throat opening of the condenser Install the louvered steam baffle, and the steam baffle and the vertical normal have an included angle of 45°.