Flue gas recirculating system based on bypass heat exchanger

A recirculation system and recirculation technology, applied in feed water heaters, preheating, exhaust gas devices, etc., can solve the problems of complicated outlet temperature adjustment, and achieve the effect of effectively controlling the furnace temperature level and suppressing or preventing furnace coking.

Pending Publication Date: 2018-12-25
中国电建集团江西省电力设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The difficulty of the double reheat boiler is the adjustment problem among the three steam temperatures of main steam, primary reheat steam and secondary reheat steam, and the adjustment of the outlet temperature of the three kinds of steam is complicated

Method used

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  • Flue gas recirculating system based on bypass heat exchanger
  • Flue gas recirculating system based on bypass heat exchanger
  • Flue gas recirculating system based on bypass heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As mentioned above, the flue gas recirculation system based on the bypass heat exchanger in this embodiment includes: a main flue is connected to the flue gas outlet of the boiler, and a preheater and a low-pressure economizer are sequentially arranged on the flue gas main pipe , electrostatic precipitator, induced draft fan, the flue gas main pipe behind the electric precipitator is connected with a recirculation flue, and the recirculation flue is connected to the boiler furnace, at the air inlet of the recirculation fan to the boiler furnace The recirculation flue between them is equipped with an adjusting baffle device, the preheater is provided with a cooling bypass, and a heat exchanger is installed on the cooling bypass, and the heat exchange working fluid of the heat exchanger adopts the unit The low-pressure economizer system exports low-temperature flue gas.

[0022] In this embodiment, the cold flue gas is exchanged with the flue gas after u...

Embodiment 2

[0025] This embodiment is based on the flue gas recirculation system of the bypass heat exchanger. On the basis of Embodiment 1, the recirculation fan is a centrifugal or axial flow fan, and 4 recirculation fans are provided. Each recirculation fan The flue gas extracted separately is sent to the lower four corners of the boiler furnace respectively.

[0026] In this embodiment, the recirculated flue gas directly enters the flue gas recirculation fan, and then is sent to the lower four corners of the boiler furnace. In order to increase the flexibility of flue gas regulation, Anyuan Project has installed four 30% capacity centrifugal furnace fume fans, all of which are controlled by frequency conversion.

[0027] The flow medium of the flue gas recirculation fan is a high-temperature and high-dust medium. The mechanism of wear is the erosion and wear of materials caused by dust being entrained in the airflow and impacting the wall under its own inertia. In the outlet area of ...

Embodiment 3

[0029] This example is based on the flue gas recirculation system of the bypass heat exchanger. On the basis of Example 1, the flue gas recirculation fan adopts the following combined anti-wear technical measures:

[0030] Low-speed fans are used, and the fan speed does not exceed 1000rpm.

[0031] The impeller and casing are cast with new wear-resistant alloy, the impeller is integrally cast, and the upper part of the casing is equipped with a wear-resistant composite plate.

[0032] The surface of the impeller is made of new surfacing and wear-resistant Fe-05 material.

[0033] The new technology of fan flow field design (such as three-dimensional flow) is adopted to further optimize the fan flow field and improve the overall wear resistance.

[0034] After adopting the above-mentioned anti-wear technical measures, the continuous operation period of the fan can reach more than 2 years, which fully meets the maintenance and operation requirements of thermal power plants.

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Abstract

The invention relates to a flue gas recirculating system based on a bypass heat exchanger, and provides a system which meets reheated steam steam-temperature regulation of a secondary reheating boilerbetter. The flue gas recirculating system based on the bypass heat exchanger comprises a main flue which is connected with a flue gas outlet of a boiler, wherein a preheater, a low-pressure coal economizer, an electric dust remover and a draught fan are sequentially arranged on the flue gas main pipeline; the flue gas main pipeline behind the electric dust remover further communicates with a recirculating flue; the recirculating flue communicates with a boiler hearth; a regulating baffle plate device is arranged on the recirculating flue between a recirculating fan and a gas inlet of the boiler hearth; a cooling bypass is arranged on the preheater; a heat exchanger is arranged on the cooling bypass; and a heat exchange working medium of the heat exchanger adopts low-temperature flue gas at the system outlet of the low-pressure coal economizer of the unit. Low-temperature flue gas is fed into the hearth through the recirculating fan, so that a flue gas mixing condition of the hearth isimproved.

Description

technical field [0001] The invention specifically relates to a flue gas recirculation system based on a bypass heat exchanger. Background technique [0002] The difficulty of the double reheating boiler is the adjustment of the main steam, the primary reheating steam and the secondary reheating steam, and the adjustment of the outlet temperature of the three steams is complicated. Whether the selection of reheat steam temperature adjustment method is reasonable or not is directly related to the reliability of unit operation, unit efficiency, etc., and even directly related to the safe operation of power plants and power grids. critical for reheat boiler design. Contents of the invention [0003] In order to solve the above technical problems, the object of the present invention is to provide a flue gas recirculation system based on a bypass heat exchanger that reduces the exhaust gas temperature and improves the operating economy of the unit. [0004] The flue gas recirc...

Claims

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Application Information

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IPC IPC(8): F23J15/06F23J15/02F23J13/00F22D1/00F23L15/04F23B80/02F23C9/08
CPCF22D1/00F23B80/02F23C9/08F23J13/00F23J15/022F23J15/06F23L15/045F23J2217/102Y02E20/34
Inventor 许思龙叶漫红吴吓华刘祥玲程奎邓洪生刘寿忠林志元李剑郭小斌熊小渌
Owner 中国电建集团江西省电力设计院有限公司
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