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Steam turbine for setting adjustment level of non-high-pressure cylinder

A technology of regulating stage and high-pressure cylinder, which is applied in the direction of steam application, mechanical equipment, steam engine device, etc., which can solve the problems of throttling loss steam reduction, lower unit safety and economy, easy jamming of pressure difference, etc.

Pending Publication Date: 2018-05-22
冯煜珵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rotating baffles are used in impulsive units. The structure is much more complicated than that of valves, and it is easy to jam when the pressure difference is large, which reduces the safety and economy of unit operation.
Therefore, most of the units are now equipped with regulating valves to adjust the parameters of heating and extraction steam. Take the example of setting a regulating valve on the connecting pipe from the exhaust steam of the medium pressure cylinder to the steam intake of the low pressure cylinder. Residential heating and industrial steam, etc.), by adjusting the regulating valve to make the heating steam pressure parameters meet the user's needs, but the throttling loss caused by the regulating valve will greatly reduce the work done by the steam in the low-pressure cylinder

Method used

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  • Steam turbine for setting adjustment level of non-high-pressure cylinder
  • Steam turbine for setting adjustment level of non-high-pressure cylinder
  • Steam turbine for setting adjustment level of non-high-pressure cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Take the N600-24.2 / 566 / 566 supercritical unit of a power plant as an example to supply heat to a heat user who requires low-pressure steam of 650t / h (heating parameters are 1MPa, 300°C).

[0050] When the supercritical unit is without heat supply, the inlet steam pressure and temperature of the low-pressure cylinder are 0.809MPa and 372.50℃ under 75%THA working condition, and the main steam flow rate is 1233 t / h. The temperature of the steam entering the low-pressure cylinder is higher than the user's demand, and the temperature reduction device of the pressure regulating station can be used to meet the steam temperature; but the pressure of the steam is far lower than the user's demand, which obviously cannot meet the user's demand.

[0051] Boundary conditions: (1) The regulating valve in the pressure regulating station is fully open; (2) In order to simplify the calculation and analysis process, temporarily ignore the heating steam from the extraction point on the ste...

Embodiment 2

[0060] For the non-high pressure cylinder of the present invention, the heating mode of the steam turbine of the adjustment stage is set, and the schematic diagram is as follows Figure 5 As shown, a regulating stage is set at the inlet of the medium-pressure cylinder of the primary reheat steam turbine, and steam is extracted from the steam inlet pipe of the medium-pressure cylinder for heating, and the pressure of the heating steam is controlled by controlling the opening of the corresponding regulating valve in the regulating stage , the heating steam is supplied to the heat user after passing through the pressure regulating station, so as to meet the heat user's medium-pressure steam parameter requirements.

[0061] The correlation calculation and analysis process of this embodiment is similar to that of Embodiment 1, and will not be repeated here.

Embodiment 3

[0063] For the non-high pressure cylinder of the present invention, the heating mode of the steam turbine of the adjustment stage is set, and the schematic diagram is as follows Figure 6 As shown, a regulating stage is set at the inlet of the medium-pressure cylinder of the primary reheat steam turbine, and steam is extracted from the steam inlet pipe of the medium-pressure cylinder for heating, and the pressure of the heating steam is controlled by controlling the opening of the corresponding regulating valve in the regulating stage , the heating steam is supplied to the heat user after passing through the pressure regulating station to meet the heat user's medium-pressure steam parameter requirements;

[0064] At the same time, a regulating stage is set at the inlet of the low-pressure cylinder of the steam turbine, and steam is extracted from the steam inlet pipe of the low-pressure cylinder for heating, and the pressure of the heating steam is controlled by controlling the...

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PUM

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Abstract

The invention discloses a steam turbine for setting an adjustment level of a non-high-pressure cylinder. The steam turbine comprises a high-pressure cylinder, the non-high-pressure cylinder and the adjustment level which is set in the non-high-pressure cylinder, and the adjustment level is composed of adjustment valves, steam inlet chambers, adjustment level spray nozzle sets and adjustment levelmovable vanes. The non-high-pressure cylinder comprises a middle-pressure cylinder or a low-pressure cylinder of a primary reheating unit and a first middle-pressure cylinder or a second middle-pressure cylinder or a low-pressure cylinder of a secondary reheating unit. At least one cylinder body in the non-high-pressure cylinder is provided with the adjustment level, when the steam turbine actually runs, steam in an inlet steam pipe of the non-high-pressure cylinder which is provided with the adjustment level is pumped out for heat supply, and by controlling the adjustment valves in the adjustment level, pressure parameters of heat supply steam meet the user requirement; meanwhile, on the basis that the high efficiency of the adjustment level is obtained, the steam throttling loss caused by a throttling pressure adjustment and heat supply mode of steam inlet adjustment valves of a traditional steam cylinder is lowered as much as possible or even eliminated.

Description

technical field [0001] The invention relates to a steam turbine provided with a regulating stage for a non-high pressure cylinder, which belongs to the field of thermal energy power. Background technique [0002] In the dispatching sequence of the power grid, the characteristics of nuclear power that is not easy to shave determines its operation mode with base load in the power grid. With the rapid growth of renewable energy power generation, except for hydropower, wind power and solar power are uncontrollable and belong to random power sources. If the power grid needs to absorb it, it must be matched by other forms of power generation that can quickly adjust the peak value. In the power grid, the best peak-shaving power source is hydropower, including pumped storage power plants, followed by gas turbine power generation. At present, in order to reduce carbon dioxide emissions and seasonal reasons, the power grid often allows hydropower to be generated more or even at full...

Claims

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Application Information

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IPC IPC(8): F01K7/38F01K17/02F01D17/10
CPCF01K7/38F01D17/10F01K7/345F01K17/02
Inventor 冯煜珵
Owner 冯煜珵