CN218971277U

CN218971277U - Steam turbine with single-section valve control and inlet steam regulated by nozzle regulation method

Info

Publication number: CN218971277U
Application number: CN202222418666.1U
Authority: CN
Inventors: 王健
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-05-05
Anticipated expiration: 2032-09-13

Abstract

A steam turbine with a simple-control nozzle for adjusting steam inlet comprises an upper steam chamber, a lower steam chamber, a nozzle communicated with the lower steam chamber, a valve butterfly group and a steam turbine, wherein a partition plate is arranged in the lower steam chamber of the steam turbine to divide the lower steam chamber into at least more than two steam chambers, the position of each steam chamber is communicated with the part of the nozzle, and each steam chamber is connected with an opening of a valve butterfly at the corresponding position of the valve butterfly group. The steam turbine has the advantages of meeting the requirements of a nozzle adjusting method steam turbine with stable steam pressure and unstable flow fluctuation, and guaranteeing the maximization of the efficiency of the steam turbine under variable working conditions.

Description

Steam turbine with single-section valve control and inlet steam regulated by nozzle regulation method

Technical Field

The utility model relates to the technical field of steam turbines, in particular to a steam turbine with a single-regulation valve controlled by a nozzle regulation method for regulating steam admission.

Background

In the converter steelworks waste heat saturated steam power generation project, saturated steam produced by a converter steelworks waste heat boiler passes through a heat accumulator, and the steam characteristics are as follows: the pressure can be kept stable, and the flow fluctuation is large. At present, the steam inlet of the small-sized steam turbine used in China adopts a throttling regulation method, the structure is shown in fig. 1 and 2, the regulation method only has the condition that the regulating valve is fully opened when the rated load is applied, the throttling loss is minimum, and the efficiency of the steam turbine is highest at the moment. When the load is reduced, the regulating valve is closed down, so that the steam generates throttling effect in the regulating valve, the pressure of the steam is reduced, and then the steam enters the steam turbine. There is a throttling loss due to the throttling effect and the efficiency of the turbine is also reduced. The flow of saturated steam of the waste heat of the converter is not large and stable, only a small turbine can be selected, and when the flow load fluctuates, the efficiency of the turbine is greatly reduced when the turbine deviates from the full-load working condition. Therefore, the requirement of converter waste heat saturated steam power generation can be met by adopting a nozzle adjusting method to enter the steam turbine. The structure of the steam turbine is shown in fig. 3 and 4, each adjusting valve controls a group of nozzles, and the opening number of the adjusting valves is determined according to the load. There is also a throttling loss when each regulating valve is not fully opened, but this is only a part of the total steam, so the throttling loss is small. The disadvantage is that the adjustment is complex when the turbine is manufactured, overhauled and installed by the nozzle adjusting method, and the method is generally used on a large-scale turbine.

Disclosure of Invention

The utility model aims to provide a steam turbine with inlet steam regulated by a nozzle regulating method, which is simple and practical, can improve the efficiency under the steam flow change working condition and is easy to overhaul, install and regulate.

The technical scheme disclosed by the utility model is as follows:

a steam turbine with a simple-control nozzle for adjusting steam inlet comprises an upper steam chamber, a lower steam chamber, a nozzle communicated with the lower steam chamber, a valve butterfly group and a steam turbine, wherein a partition plate is arranged in the lower steam chamber of the steam turbine to divide the lower steam chamber into at least more than two steam chambers, the position of each steam chamber is communicated with the part of the nozzle, and each steam chamber is connected with an opening of a valve butterfly at the corresponding position of the valve butterfly group.

As a preferable scheme, grooves are formed in the top surface and the bottom surface of the inner cavity of the lower steam chamber respectively, and the partition plate is inlaid in the grooves.

The beneficial effects of the utility model are as follows: 1. steam entering the steam turbine through the adjusting valve enters each steam chamber in the lower steam chamber under the control of a plurality of valve butterfly valves which are sequentially opened and closed, partial nozzles corresponding to each steam chamber enter the steam turbine, the opening number of the valve butterfly valves is determined according to the load, the steam turbine with a nozzle adjusting method, which has stable steam pressure and unstable flow and large fluctuation, is satisfied, and the maximum efficiency of the steam turbine under the variable working condition is ensured; 2. the baffle that sets up in the vapour is for mosaic installation, and the extraction that can be convenient in the maintenance in-process overhauls the installation adjustment more easily.

Drawings

FIG. 1 is a view of the steam inlet structure of a current throttle valve.

Fig. 2 is a cross-sectional view of fig. 1.

FIG. 3 is a block diagram of a steam turbine using a nozzle modulation method commonly used at present.

Fig. 4 is a cross-sectional view of fig. 3.

Fig. 5 is a schematic structural view of the present utility model.

Fig. 6 is a cross-sectional view of fig. 3.

The detail of the components of the drawings is as follows: 1. the steam turbine comprises an upper steam chamber, 2, a lower steam chamber, 3, a nozzle, 4, a regulating valve, 5, a valve butterfly group, 6, a steam turbine, 7, a partition plate, 8, a first steam chamber, 9, a second steam chamber, 10, a third steam chamber, 11 and a steam inlet pipeline.

Detailed Description

The utility model is further illustrated and described below in conjunction with the specific embodiments and the accompanying drawings:

referring to fig. 5 and 6, the present utility model includes an upper steam chamber 1, a lower steam chamber 2, a nozzle 3, a valve butterfly group 5, and a steam turbine 6, wherein the lower steam chamber 2 of the steam turbine 6 is divided into a first steam chamber 8, a second steam chamber 9, and a third steam chamber 10, which are respectively and locally communicated with the corresponding positions of the nozzle 3, by a partition 7. The valve butterfly group 5 comprises valve butterflies 1-5, wherein the first steam chamber 8 is connected with valve butterflies 1-3 of the valve butterfly group 5; the second steam chamber 9 is connected with the No. 4 valve butterfly of the valve butterfly group 5, and the third steam chamber 10 is connected with the No. 5 valve butterfly of the valve butterfly group 5. The top surface and the bottom surface of the inner cavity of the lower steam chamber 2 are respectively grooved, the partition plate 7 is embedded in the grooves, and the partition plate and the lower steam chamber shell are installed in an embedded module mode, so that the disassembly and the assembly are convenient.

The implementation way of the utility model is as follows:

the unstable steam source that converter steelworks exhaust-heat boiler comes out is connected into the last steam chamber 1 of steam turbine regulation valve 4 through the pipeline, and the 1-3 valve butterfly of the valve butterfly group 5 of regulation valve 4 is gradually opened in proper order, and steam gets into first steam chamber 8 through 1-3 valve butterfly by last steam chamber 1 to get into the steam turbine through the nozzle that is located in first steam chamber 8, and second steam chamber 9, third steam chamber 10 correspond 4, no valve butterfly of 5 are opened at this moment, and both steam chambers are not enabled. When the working condition is changed, the valve butterfly of the No. 4 and the valve butterfly of the No. 5 are sequentially opened according to the requirement of the steam inlet quantity, and the second steam chamber 9 and the third steam chamber 10 are started to increase the steam inlet.

The steam quantity entering the steam turbine can determine the opening number of the valve butterfly according to the load so as to control whether each steam chamber is started or not.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims

1. The utility model provides a steam turbine of admission is adjusted to nozzle regulation method of single regulation valve control, includes last steam pocket (1), lower steam pocket (2), nozzle (3) of intercommunication lower steam pocket (2), valve butterfly group (5), steam turbine (6), its characterized in that: a partition plate (7) is arranged in a lower steam chamber (2) of the steam turbine (6) to divide the lower steam chamber (2) into at least more than two steam chambers, the position of each steam chamber is communicated with the part of the nozzle (3), and each steam chamber is connected with an opening of a valve butterfly at a position corresponding to the valve butterfly group (5).

2. A steam turbine with inlet steam regulated by a single-throttle valve controlled nozzle regulation method according to claim 1, wherein: the top surface and the bottom surface of the inner cavity of the lower steam chamber (2) are respectively grooved, and the partition plate (7) is inlaid in the grooves.