Double backpressure condenser optimized operation device and operation method thereof

A technology for optimizing operation and operation methods, applied in steam/steam condensers, lighting and heating equipment, etc., and can solve problems such as increased back pressure of low back pressure side condensers, increased heat consumption rate of steam turbines, and decreased tightness. , to achieve the effect of reducing the heat consumption rate

Active Publication Date: 2016-08-17
CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the tightness of the vacuum system of the steam turbine on the low back pressure side is reduced due to external reasons, since the vacuum pumping system adopts a series mode and one vacuum pump is running, the back pressure of the condenser on the low back pressure side will increase, and the heat of the steam turbine will The consumption rate increases, and it is not easy to be noticed by the operator

Method used

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  • Double backpressure condenser optimized operation device and operation method thereof
  • Double backpressure condenser optimized operation device and operation method thereof
  • Double backpressure condenser optimized operation device and operation method thereof

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Embodiment 1

[0040] An optimal operation device for double back pressure condensers, including a high back pressure condenser 2, a low back pressure condenser 1 and a circulating water pipeline, the circulating water pipeline is divided into a first circulating water pipeline 11 and a second circulating water pipeline 12. Both the first circulating water pipeline 11 and the second circulating water pipeline 12 flow from the low back pressure condenser 1 to the high back pressure condenser 2, which is characterized in that a first bypass is set on the first circulating water road, The first bypass is connected across the two ends of the low back pressure condenser 1, a second bypass is provided on the second circulating waterway, and the second bypass is also connected across the two ends of the low back pressure condenser 1, A second control valve 41 is arranged on the first bypass, and a second control valve 42 is arranged on the second bypass. When the unit is running and the vacuum of t...

Embodiment 2

[0047] An operation method for the above-mentioned double back pressure condenser optimal operation device, characterized in that it comprises the following steps:

[0048] Step 1. Calculation of steam turbine blocking back pressure value P z ,

[0049] P z =f(G ms )------Formula 1)

[0050] where G ms is the main steam flow rate of the steam turbine, the unit is kg / s, obtained by the DCS system of the steam turbine;

[0051] Step 2. Calculating the blocked exhaust steam temperature t of the steam turbine z , according to the turbine blocking back pressure value P calculated in step 1 z , according to the IF-97 water vapor formula, the corresponding saturated steam temperature is the steam turbine blocked exhaust temperature t z ; The main steam flow G of the steam turbine obtained by the unit DCS control system ms , calculate the corresponding blocking back pressure value according to the formula (1), and calculate the corresponding saturated steam temperature t accor...

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Abstract

The invention discloses a double backpressure condenser optimized operation device and an operation method thereof. The double backpressure condenser optimized operation device comprises a high backpressure condenser, a lower backpressure condenser and a circulating water pipeline, wherein two bypasses and a control valve are arranged on the circulating water pipeline, the bypasses are connected with the two ends of the low backpressure condenser in a crossing manner, and a plurality of temperature measuring points and flow meters are arranged. Compared with the prior art, the double backpressure condenser optimized operation device has the advantages that circulating water flow rate of the low backpressure condenser is independently controlled, the circulating water flow rate of the high backpressure condenser is not influenced; by virtue of a calculation formula provided by the invention as well as the measuring points and a valve control system, the low backpressure side condenser is vacuum and does not enter a blockage backpressure region, and heat rate of a steam turbine is reduced; and due to influence of the circulating water bypasses, water inlet temperature of circulating water at the high backpressure side condenser is relatively low, and high backpressure side exhaust temperature is indirectly lowered, so that the heat rate of the steam turbine is further reduced.

Description

technical field [0001] The invention relates to the technical field of steam turbine control, in particular to a method and a control system for optimal operation of a double back pressure steam turbine condenser. Background technique [0002] Turbine blocking back pressure refers to the back pressure when the steam flow velocity at the outlet of the last stage blade of the steam turbine is close to the sonic level (Mach number is about 0.95). Under normal circumstances, it is related to the steam intake of the steam turbine. Different steam intake There are different blocking back pressure values, the smaller the steam intake of the turbine, the lower the blocking back pressure of the steam turbine. [0003] When the back pressure of the steam turbine is lower than the blocking back pressure, the heat rate of the steam turbine increases under the same power generation of the steam turbine unit. [0004] The back pressure of the dual back pressure steam turbine in thermal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28B11/00
CPCF28B11/00
Inventor 阮圣奇吕松松胡中强任磊陈裕蒋怀锋吴仲邵飞徐钟宇陈悦庞靖袁昊
Owner CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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