Waste heat utilization system capable of guaranteeing lignite boiler dry output and SCR safe flue gas temperature

A boiler and lignite technology, applied in lighting and heating equipment, preheating, feed water heaters, etc., can solve problems such as hot air temperature reduction, insufficient drying output of the pulverizing system, affecting unit load capacity, etc., and achieve the effect of reducing coal consumption

Inactive Publication Date: 2014-01-01
XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD +1
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Problems solved by technology

However, the temperature of the flue gas at the inlet of the air preheater decreases, the temperature of the hot air decreases, and the moistu

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  • Waste heat utilization system capable of guaranteeing lignite boiler dry output and SCR safe flue gas temperature

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0022] see figure 1 , the present invention includes a boiler tail flue 1, and a flue gas denitrification SCR7 arranged at the end of the boiler tail flue 1; an economizer 3 is arranged in the boiler tail flue 1 before the flue gas inlet of the flue gas denitrification SCR7; Between the flue gas inlet of the economizer 3 and the flue gas denitrification SCR7, there is a bypass flue 2 connected in parallel with the boiler tail flue 1, and the inlet of the bypass flue 2 is connected to the flue gas of the economizer 3. The gas entrance is connected, and the entrance of the bypass flue 2 is provided with a bypass flue gas baffle 6 for adjusting the amount of flue gas entering the bypass flue 2; the outlet of the bypass flue 2 is connected to the flue gas denitrification SCR7 The flue gas entrance is connected; the bypass flue 2 is sequentially provided with a primary ai...

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Abstract

The invention discloses a bootstrap system capable of guaranteeing lignite boiler dry output and SCR safe flue gas temperature. The bootstrap system comprises a boiler tail flue and a flue gas denitrification SCR which is arranged at the tail end of the boil tail flue. A bypass flue communicated with the boil tail flue is further parallelly connected between a flue gas inlet of an economizer and a flue gas inlet of the flue gas denitrification SCR. The bypass flue is internally and sequentially provided with a primary-air tubular heater and a low-pressure economizer which are used for lowering temperature of flue gas entering the flue gas denitrification SCR. Due to the arrangement that the bypass flue is additionally arranged on the tail portion of a boiler, and the primary-air heater is arranged on the upper portion of the bypass flue, primary-air temperature is ensured to meet requirements of a coal pulverizing system. The amount of flue gas passing through the economizer can be regulated by the bypass flue, so that flue gas temperature at the exit of the economizer can be regulated. The primary air is heated to the temperature as required by the high-temperature flue gas at the inlet of the economizer, and meanwhile, the flue gas temperature in the bypass flue is lowered through the low-pressure economizer, so that the flue gas temperature at the inlet of the SCR can meet the requirements of catalyst.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery from flue gas of power station boilers, and in particular relates to a waste heat utilization system for ensuring the drying output of lignite boilers and the safe smoke temperature of SCR. Background technique [0002] The "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011) has been implemented since 2012, replacing GB13223-2003 and further improving the SO2 of coal-fired power plants. 2 , NO x and dust emission standards. According to the new standard of GB13223-2011, coal-fired power plants are required to x Emission control at 100mg / Nm 3 , key areas controlled at 50mg / Nm 3 . With the promulgation and implementation of the new standard "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), it is imperative for coal-fired power plants to carry out flue gas denitrification SCR transformation. [0003] Due to the high moisture con...

Claims

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Application Information

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IPC IPC(8): F22D1/36F22D1/50F23J15/02
Inventor 李红智姚明宇徐党旗赵治平贾兆鹏周飞薛宁陆军
Owner XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD
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