What are the requirements for the steam entering the turbine?

Does steam enter the turbine directly from the steam pipeline? Please refer to the post by zgj2405 on page 2 at http://bbs.hcbbs.com/viewthread.php?tid=823543. * F8 ?6 ^1 J! l4 _9 v+ D Main steam system: The main steam pipeline refers to the pipe that transports fresh steam from the boiler superheater outlet to the high-pressure main steam valve of the turbine. It also includes the drain pipes on this pipeline, as well as the safety valves and exhaust pipes at the boiler superheater outlet. It also includes the drain pipes on the pipelines, as well as the safety valves and steam discharge pipes at the outlet of the boiler superheater. The main steam system adopts a “2–1–2” layout. The main steam exits from the boiler superheater outlet header through two branch pipes, which then combine into a single pipe leading to the turbine hall. Before entering the turbine, it is divided into two pipes using a 45° angled tee, with these pipes connecting to the main steam valves on the left and right sides of the high-pressure cylinder inlet of the turbine. A main steam valve is installed on each side of the turbine’s high-pressure cylinder; its primary function is to quickly cut off the main steam flowing into the turbine in the event of a turbine failure or load shedding. The main steam supply to the turbine is shut off rapidly. The main steam valve is directly connected to the steam chamber of the turbine’s speed control valve; during normal shutdown of the turbine, the main steam valve is also used to cut off the main steam, thereby preventing water or other debris from entering the area around the main steam valve. One main steam valve corresponds to two throttle valves. Throttle valves are used to regulate the flow of steam into the turbine; one main steam valve is accompanied by two throttle valves. One main steam valve is paired with two throttle valves to control the steam flow and meet the requirements of changes in the unit’s load. Steam flow, to meet the requirements of changes in the unit load. By using a single-tube system, the steam flows on the left and right sides of the boiler superheater outlet header can mix thoroughly, which helps to eliminate potential temperature differences, reduce thermal stress in the cylinders, and prevent friction at the shaft seals ； It also helps to reduce the pressure drop of the main steam, as well as the pressure variations caused by differences in pipeline layout resistance. It can also save on pipeline investment costs. No flow measurement devices are installed on the main steam pipeline; the main steam flow is determined based on the difference between the main steam pressure and the steam pressure after passing through the turbine’s control stages. This approach avoids pressure losses and improves thermal efficiency. The difference in steam pressure after each stage is determined, which avoids pressure losses and improves thermal efficiency. The automatic main steam valve at the turbine inlet has reliable tightness, therefore no electric isolation valve is installed on the main steam pipeline. In this way, the pressure loss in the main steam pipeline is reduced, reliability is improved, and operating and maintenance costs are lowered. A block valve for hydraulic testing is installed on the outlet pipe of the boiler superheater, to isolate the boiler from the turbine during the boiler’s hydraulic testing. Steam sampling branch pipes are also provided at the control level. Steam sampling branch pipes are also provided at the control level. II. Heat and reheat steam system: The heat and reheat steam pipes refer to those that transport high-temperature reheat steam from the boiler reheater outlet to the inlet of the turbine’s intermediate pressure cylinder. These pipes also include the drain pipes attached to them, as well as the safety valves and exhaust pipes located at the boiler reheater outlet. Full valve and exhaust pipe. The thermal reheat steam system of this unit also adopts a “2–1–2” layout. The high-temperature reheat steam is drawn off from the boiler reheater outlet header through two branch pipes, where it merges into a single pipe that leads to the turbine’s intermediate-pressure cylinder. Before the turbine’s intermediate-pressure combined valve, this pipe is divided into two branches using a 45° angled tee, with each branch connecting to one of the turbine’s intermediate-pressure combined valves. Since the pressure loss of reheat steam has a greater impact on the thermal efficiency of the unit than that of fresh steam, a single-tube system can more effectively reduce this pressure loss and maintain the steam’s capacity to do work. Furthermore, it can also eliminate the temperature variation in the high-temperature reheat steam entering the intermediate-pressure cylinder of the turbine. The medium-pressure combined valve is a composite valve consisting of a filter, a medium-pressure main valve, and a medium-pressure control valve. Its function is to quickly shut off the high-pressure combined valve from the boiler reheater to the turbine’s intermediate pressure cylinder when the turbine trips. Reheat the steam to prevent the turbine from overspeeding.

Thank you! I mainly want to know what requirements exist regarding the quality of steam before it enters the main steam lift valve Mainly impurity content and water content, etc. As for impurities, it is related to whether the main steam pipeline has been purged thoroughly. Is there a standard basis for purging? Thank you!

This post was last edited by Peach wood and osmanthus fragrance on 2011-12-11 at 18:26. There are many such posts; testing is required to determine whether the pipes are of satisfactory quality.