Integral full-circumference nozzle chamber of high back pressure steam turbine

Abstract

The invention discloses an overall complete-cycle nozzle chamber of a high back pressure turbine, and relates to the technical field of energy and power. The overall complete-cycle nozzle chamber comprises an outer cylinder body and a nozzle chamber body. The two ends of the outer wall of the nozzle chamber body are symmetrically provided with ledges. The nozzle chamber body is supported at the horizontal half joint position at the lower half portion of the outer cylinder body through the ledges at the two ends. The nozzle chamber body adopts an inblock casting structure. The nozzle chamber body is divided into five nozzle cavities, the nozzle cavities form an annular structure, the five nozzle cavities are each provided with one nozzle set, each nozzle set is composed of at least four common nozzles, wherein the distance between every two adjacent common nozzles is equal, partition ribs are arranged between the nozzle cavities, and flat-headed nozzles are arranged on the partition ribs. According to the overall complete-cycle nozzle chamber of the high back pressure turbine, the complete-cycle nozzle chamber is obtained through inblock casting, complete-cycle steam inflow and uniform heating are achieved, some steam inflow losses are eliminated completely, and the efficiency and the rapid starting performance of the high back pressure turbine are improved.

Description

Technical field: [0001] The invention relates to the technical field of energy and power, in particular to an integral circumferential nozzle chamber of a high back pressure steam turbine. Background technique: [0002] A high back pressure steam turbine refers to a back pressure steam turbine with an inlet steam pressure between 8MPa and 12MPa and an exhaust steam pressure between 3MPa and 7MPa. The high back pressure steam turbine converts high-parameter steam (standard configuration parameters of the boiler) into medium-parameter steam, and drives various pumps, fans, compressors, generators and other equipment on the basis of meeting the steam demand of process equipment, and replaces Reduce temperature and pressure reducer to improve energy utilization. [0003] In order to realize the nozzle adjustment of the steam turbine, the steam turbine is arranged as a multi-section nozzle group. Usually, each nozzle group corresponds to a nozzle chamber, and the nozzle chambers...

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Problems solved by technology

[0003] In order to realize the nozzle adjustment of the steam turbine, the steam turbine is arranged as a multi-section nozzle group. Usually, each nozzle group corresponds to a nozzle chamber, and the nozzle chambers are all cast separately, which leads to a certain gap between the nozzle chambers. There is no nozzle group in the wall thickness range at the end, that is to say, there is a partial steam intake, resulting in a partial loss of steam intake, and the size of the partial intake steam loss is related to the number of nozzle groups, which reduces the efficiency of the steam turbine

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