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Flue gas recirculating temperature-regulation system of novel double reheating power station boiler

A technology for secondary reheating and power station boilers, applied in the field of regulation systems, can solve the problems of increased boiler exhaust gas temperature, reduced reliability of furnace flue gas recirculation fans, and reduced boiler efficiency, and has achieved the effect of saving huge investment.

Active Publication Date: 2013-01-09
章礼道
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the inlet of the fume recirculation fan is connected to the outlet of the economizer, high dust, high working temperature, low flue gas density, and high rotation speed will reduce the reliability of the fume recirculation fan and increase the power consumption ; When the inlet of the furnace smoke recirculation fan is connected to the outlet of the dust collector, the flow rate of the smoke side of the air preheater increases by 10% to 20%, which will cause a significant increase in the exhaust gas temperature of the boiler and a decrease in boiler efficiency

Method used

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  • Flue gas recirculating temperature-regulation system of novel double reheating power station boiler
  • Flue gas recirculating temperature-regulation system of novel double reheating power station boiler
  • Flue gas recirculating temperature-regulation system of novel double reheating power station boiler

Examples

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Effect test

Embodiment 1

[0032] Combine now figure 1 and image 3 , taking a 1000MW grade secondary reheat Π-type utility boiler with design values ​​of main steam temperature / primary reheat steam temperature / secondary reheat steam temperature as 605°C / 623°C / 623°C as an example to illustrate the realization of the invention Preferred way.

[0033] A novel flue gas recirculation temperature adjustment system for a secondary reheat power station boiler of the present invention includes a temperature adjustment smoke air nozzle group (4), a temperature adjustment smoke air header (5), a temperature adjustment smoke air duct (7), Temperature-regulating air-smoke ejector (9), ejector flue gas suction side shut-off baffle (8), ejector hot primary air adjustment baffle (10), hot primary air duct (11), DCS control system; in the boiler At medium and low loads, the hot primary air enters the temperature-regulating air-smoke ejector (9) through the hot primary air channel (11) and the hot primary air regulati...

Embodiment 2

[0036] Combine now figure 2 and image 3 , taking a 1000MW grade secondary reheat tower power plant boiler with design values ​​of main steam temperature / primary reheat steam temperature / secondary reheat steam temperature as 605°C / 623°C / 623°C as an example to illustrate the realization of the invention Preferred way.

[0037]A novel flue gas recirculation temperature adjustment system for a secondary reheat power station boiler of the present invention includes a temperature adjustment smoke air nozzle group (4), a temperature adjustment smoke air header (5), a temperature adjustment smoke air duct (7), Temperature-regulating air-smoke ejector (9), ejector flue gas suction side shut-off baffle (8), ejector hot primary air adjustment baffle (10), hot primary air duct (11), DCS control system; in the boiler At medium and low loads, the hot primary air enters the temperature-regulating air-smoke ejector (9) through the hot primary air channel (11) and the hot primary air regul...

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Abstract

The invention discloses a flue gas recirculating temperature-regulation system of a novel double reheating power station boiler and relates to a regulation system for regulating the main steam temperature, the single reheating steam temperature and the double reheating steam temperature of a double reheating power station boiler which is used by a thermal power station. The system comprises a temperature-regulation flue-air injector set, a temperature-regulation flue-air header, a temperature-regulation flue-air duct, a temperature-regulation air-flue ejector, an ejector flue gas suction side shutoff baffle plate, an ejector thermal primary air regulation baffle plate, a thermal primary air duct and a distributed control system (DCS), wherein the primary air regulation baffle plate is opened when the boiler load is lower than 70% of the boiler maximum continuous rating (BMCR), and the weight flow of a temperature-regulation flue-air mixture is adjustable within a range of 0-15% of the BMCR flue gas weight flow. By the aid of the system, the problem that the double reheating steam outlet temperature is difficult to reach the designed value under working conditions of 50%-60% of the BMCR when a flue gas recirculating fan is not used in the prior art is solved, the energy consumption required for flue gas recirculating temperature-regulation is greatly reduced, the infrastructure investment is saved, the plant electrical consumption is saved, the system is wear-resistant, and operation and maintenance costs are saved.

Description

(1) Technical field: [0001] The present invention relates to a novel furnace smoke recirculation temperature adjustment system for a secondary reheating power plant boiler, which relates to the control of the main steam temperature, the primary reheating steam temperature and the secondary reheating steam temperature of a secondary reheating power plant boiler used in a thermal power station. Regulate the system. (two) background technology: [0002] The double-reheat power plant boilers used in thermal power plants in the prior art are used to supply steam to the double-reheat turbo-generator sets, and the typical boiler-side main steam temperature / primary reheat steam temperature / secondary reheat steam temperature The design value is 605°C / 623°C / 623°C. [0003] A typical double-reheat turbogenerator is equipped with a four-stage high-pressure heater and a separate steam cooler, and the boiler feed water temperature is as high as 330°C; the inlet temperature of the primary...

Claims

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Application Information

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IPC IPC(8): F22G3/00F22G5/06
Inventor 章礼道
Owner 章礼道
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