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Thermodynamic system of concurrent heating ultra-high pressure/subcritical backpressure heat supply unit

A technology for heating units and thermal systems, which is applied in the directions of machines/engines, mechanical equipment, steam engines, etc., can solve the problem that the main steam pressure of the back pressure unit cannot be further greatly increased, and achieves increased degrees of freedom and direct economic benefits. Obvious, increase the effect of selection

Active Publication Date: 2015-07-08
南京博沃科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, with the existing technical solutions, it is impossible to further greatly increase the main steam pressure of the back pressure unit to improve the economical efficiency of the unit operation

Method used

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  • Thermodynamic system of concurrent heating ultra-high pressure/subcritical backpressure heat supply unit
  • Thermodynamic system of concurrent heating ultra-high pressure/subcritical backpressure heat supply unit
  • Thermodynamic system of concurrent heating ultra-high pressure/subcritical backpressure heat supply unit

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Embodiment 1

[0037] figure 2 The main steam parameter in the thermal system shown is 13.24MPa / 535°C. The system process is generally similar to the prior art. However, under the condition of ensuring the rated heating pressure, the temperature of the steam turbine exhaust and / or extraction steam is already lower than the heating Rated temperature, so a supplementary heating system is added. The heat supplement system is connected after the steam turbine exhaust and / or steam extraction and before the heating sub-cylinder, and includes a first heat supplement, a first heat supplement bypass valve, a second heat supplement, and a second heat bypass valve, Together with the first desuperheater, the first desuperheater, the second desuperheater, and the second desuperheater, it can adjust the temperature of the exhaust and / or extraction steam of the steam turbine to make the heating steam quality meet the requirements of thermal users.

Embodiment 2

[0039] image 3 The main steam parameter in the thermal system shown is 13.24MPa / 555°C, and the system process is basically similar to the first embodiment of the present invention, except that a low-pressure deaerator and a low-pressure feed water pump are added to the low-pressure regenerative system, which are arranged on the shaft Seal the space between the heater and the desalinated water heater. The low-pressure deaerator and the high-pressure deaerator operate in series. The low-pressure deaerator removes the main or part of the oxygen and other non-condensed gases in the brine in advance, reduces the corrosion of the desalinated water heater, and reduces the deaerator higher than the deaerator. Oxygen load, the high-pressure deaerator further reduces the dissolved oxygen and non-condensable gas in the demineralized water, ensuring the long-term safe and stable operation of the subsequent equipment of the thermal system.

Embodiment 3

[0041] The thermal system of Example 3 is similar to that of Example 1, except that the specific design of the supplemental heating system and the main steam parameters are further increased to 16.67MPa / 535°C. Figure 4 It shows that the heat supplement system in Example 1 mainly includes a heat supplement and a heat supplement bypass valve, and the heat supplement is arranged in the tail flue of the boiler, roughly parallel to the economizer; Figure 5 Another technical solution of the heat supplement system is shown. The heat supplement is arranged in the flue bypass at the tail of the boiler. The flue bypass baffle is provided at the bypass outlet and inlet. The opening of the baffle can be adjusted to adjust the steam temperature. To Figure 5 Replacement heating system shown figure 2 The supplementary heating system in is the thermal system diagram of Example 3. It is worth noting that only adjusting the opening of the flue bypass baffle makes it difficult to make the low-...

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Abstract

The invention discloses a thermodynamic system of a concurrent heating ultra-high pressure / subcritical backpressure heat supply unit. The thermodynamic system comprises a reheating system, a low pressure reheating system, a high pressure reheating system, a boiler, a turbine and / or a small steam turbine which drives a boiler feeding pump, wherein the low pressure reheating system and the high pressure reheating system are connected with the small steam turbine, the high pressure reheating system is connected with the boiler and the turbine, and the boiler is connected with the turbine and the reheating system; the main steam pressure of the turbine is higher than conventional pressure and reaches up to ultrahigh pressure, subcritical or supercritical grade; the reheating system comprises a re-heater, the exhaust steam or extracted steam of the turbine is supplemented and heated by the boiler gas heat by virtue of a re-heater, and then the turbine is used for heating externally after the temperature of the steam reaches the requirements; the re-heater is made from a tubular product of a conventional boiler economizer. According to the thermodynamic system provided by the invention, the steam power improvement capacity of a backpressure unit can be improved, the generating condition can be greatly improved under the condition of completing a certain heating task, and the economic benefit of a power station can be obviously improved.

Description

Technical field [0001] The invention relates to a thermal system in a power plant, in particular to a thermal system of a back pressure heat supply unit. Background technique [0002] Back pressure heating unit (hereinafter referred to as "back pressure unit") is a unit operated by combined heat and power. The combined heat and power capacity enables reasonable use of energy. In various types of generating units, the back pressure unit is directly used for heating due to the exhaust steam of the steam turbine, which eliminates the loss of the condenser’s cold source and has high thermal cycle efficiency, thereby saving energy and reducing pollutant emissions. It is widely used. [0003] The back pressure unit is divided into pure back pressure unit and back extraction unit according to whether the intermediate stage of the steam turbine provides extraction steam heating function. The pure back pressure unit can only provide heating steam of one parameter, and the back extraction ...

Claims

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Application Information

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IPC IPC(8): F01K23/04
Inventor 何长征王丽丽石伟伟
Owner 南京博沃科技发展有限公司
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