A heat-supplementing ultra-high pressure/subcritical back pressure heating unit thermal system

A heating unit and thermal system technology, applied in the field of thermal systems, can solve the problem that the main steam pressure of the back pressure unit cannot be further greatly increased, and achieve the effect of increasing the degree of freedom, obvious direct economic benefits, and improving the working ability

Active Publication Date: 2016-04-27
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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  • A heat-supplementing ultra-high pressure/subcritical back pressure heating unit thermal system
  • A heat-supplementing ultra-high pressure/subcritical back pressure heating unit thermal system
  • A heat-supplementing ultra-high pressure/subcritical back pressure heating unit thermal system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 2 The main steam parameter in the thermal system shown is 13.24MPa / 535°C. The system flow is generally similar to the existing technology, but under the condition of ensuring the rated pressure of the heating supply, the temperature of the exhaust steam and / or extraction steam of the steam turbine is already lower than that of the heating supply. Rated temperature, so a supplementary heating system was added. The supplementary heat system is connected after the exhaust port and / or steam extraction port of the steam turbine and before the heat supply sub-cylinder, including the first supplementary heater, the first supplementary heat bypass valve, the second supplementary heater, and the second supplementary heat bypass Valve, together with the first desuperheater, the first desuperheater, the second desuperheater, and the second desuperheater, adjust the temperature of exhaust steam and / or extraction steam of the steam turbine, so that the quality of the heating...

Embodiment 2

[0039] image 3 The main steam parameter in the thermal system shown is 13.24MPa / 555°C. The system flow is basically similar to that of Embodiment 1 of the present invention, the difference is that a low-pressure deaerator and a low-pressure feed water pump are added to the low-pressure recuperation system, arranged on the shaft between the seal heater and the desalinated water heater. The low-pressure deaerator and the high-pressure deaerator operate in series. The low-pressure deaerator pre-removes the main or part of oxygen and other non-condensable gases in the brine, 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 supplementary heat system and the main steam parameters are further increased to 16.67MPa / 535°C. Figure 4 It shows that the supplementary heat system in Example 1 mainly includes a supplementary heater and a supplementary heat bypass valve, and the supplementary heater is arranged in the tail flue of the boiler, roughly juxtaposed with the economizer; Figure 5 It shows another technical solution of the supplementary heating system. The supplementary heater is arranged in the flue bypass at the tail of the boiler, and there are flue bypass baffles at the bypass outlet and inlet. Adjusting the opening of the baffle can adjust the steam temperature. by Figure 5 Supplemental heating system shown in place of figure 2 The supplementary heat system in is the thermodynamic system diagram of embodiment 3. It is worth noting that it is difficult to make the low-pressure ...

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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 thermodynamic system in a power plant, in particular to a thermodynamic system of a back pressure heating unit. Background technique [0002] The back pressure heating unit (hereinafter referred to as "back pressure unit") is a unit that operates in combination of heat and power, and the combined heat and power can make energy be used rationally. In various types of generator sets, the back pressure unit is directly used for heat supply due to the exhaust steam of the steam turbine, which eliminates the loss of the cold source of the condenser and has high thermal cycle efficiency, thereby saving energy and reducing pollutant emissions. be widely used. [0003] Back-pressure units are divided into pure back-pressure units and back-extraction units according to whether the intermediate stage of the steam turbine provides the function of extracting steam for heating. The pure back pressure unit can only provide heating steam ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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