System and method for realizing zero emission of desulfurization waste water by denitrifying wide negative charges and utilizing waste heat

A technology of desulfurization wastewater and zero discharge, applied in chemical instruments and methods, separation methods, descaling and water softening, etc., can solve the problems of lower boiler exhaust gas temperature, lower boiler inlet air temperature and efficiency, etc., to achieve increased smoke Humidity, reduce emissions, and facilitate the effect of reunion

Pending Publication Date: 2018-06-08
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the unit is running at reduced load, the exhaust gas temperature of the boiler decreases. In order to ensure the evaporation of desulfurization wastewater, more flue gas needs to be introduced into the bypass flue of the air preheater, resulting in a further decrease in the boiler inlet air temperature and efficiency.

Method used

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  • System and method for realizing zero emission of desulfurization waste water by denitrifying wide negative charges and utilizing waste heat
  • System and method for realizing zero emission of desulfurization waste water by denitrifying wide negative charges and utilizing waste heat
  • System and method for realizing zero emission of desulfurization waste water by denitrifying wide negative charges and utilizing waste heat

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, a desulfurization waste water zero discharge system for wide-load denitrification and waste heat utilization includes boiler 1, economizer 2, SCR denitrification device 3, air preheater 4, electrostatic precipitator 5, The desulfurization tower 6, wherein the economizer 2 is connected to the water supply pipeline 21, and the water supply pipeline 21 is provided with a No. The room is also provided with a No. 0 high drain pipeline 34 connected in parallel with the water supply pipeline. The desulfurization waste water zero discharge system also includes a steam turbine 18 connected to the boiler through a main steam pipeline 17; it also includes a feed water recovery subsystem and an air preheater bypass flue evaporation subsystem.

[0044] The feed water heating subsystem includes an ejector steam pipe 22, an ejected steam pipe 24, and an ejector 26. The outlets of the ejected steam pipe 22 and the ejected steam pipe 24 are respectively conne...

Embodiment 2

[0057] Such as figure 2 As shown, it is another wide-load denitrification and waste heat utilization zero-discharge system for desulfurization wastewater. This embodiment is different from Embodiment 1 only in the water supply and heat recovery subsystem, and the similarities will not be repeated. The differences are:

[0058] The feed water heating sub-system includes a high-pressure steam pipeline A30, the inlet of the high-pressure steam pipeline A30 is connected to the high-pressure cylinder of the steam turbine 18, and the outlet of the high-pressure steam pipeline A30 is connected to No. There is a high-pressure steam pipeline valve A29 with an adjustable opening.

[0059] The method of this embodiment is different from that of Embodiment 1 only in "step 1", and the similarities will not be described again. The difference is:

[0060] Step 1. When the load of the unit is reduced, open the high-pressure steam pipeline valve A29, and control the steam flow by adjusting t...

Embodiment 3

[0062] Such as image 3 As shown, it is another wide-load denitrification and waste heat utilization zero-discharge system for desulfurization wastewater. This embodiment is different from Embodiment 1 only in the water supply and heat recovery subsystem, and the similarities will not be repeated. The differences are:

[0063] The feed water heating sub-system includes a high-pressure steam pipeline B33, the inlet of the high-pressure steam pipeline B33 is connected to the supplementary steam pipeline 36, and the outlet of the high-pressure steam pipeline B33 is connected to the No. The inlet of the pipeline 36 is connected with the main steam pipeline 17, and the outlet of the supplementary steam pipeline 36 is connected with the steam turbine 18; the supplementary steam pipeline 36 and the high-pressure steam pipeline B33 are respectively provided with an adjustable opening steam supplement regulating valve 31 and The high-pressure steam pipeline valve B31 ; the connection b...

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Abstract

The invention relates to a system and a method for realizing zero emission of desulfurization waste water by denitrifying wide charges and utilizing waste heat, and belongs to the fields of energy conservation and emission reduction of thermal power generation. The system comprises a boiler, a coal economizer, an SCR denitrification device, an air preheater, an electric dust remover and a desulfurization tower which are connected sequentially through a main flue; a steam turbine is connected with the boiler through a main steam pipeline; a No.1 high-pressure heater and a No.0 high-pressure heater are arranged on a water supply pipeline sequentially; and the system also comprises a water supply backheating subsystem and an air preheater bypass flue evaporation subsystem. The invention alsorelates to a method for realizing zero emission of the desulfurization waste water by denitrifying the wide negative charges and utilizing the waste heat based on the system for realizing zero emission of the desulfurization waste water. Denitrification effect improvement, zero emission of desulfurization waste water and utilization of flue gas waste heat can be realized simultaneously by increasing the smoke discharge temperature of the boiler under various low-load working conditions of a machine unit.

Description

technical field [0001] The invention relates to a desulfurization wastewater zero discharge system and method for wide-load denitrification and waste heat utilization, which can improve the denitrification efficiency of the system under various low-load working conditions of the unit, and at the same time effectively use the waste heat of exhaust smoke to realize zero discharge of desulfurization wastewater, which belongs to thermal power Power generation energy saving and emission reduction field. Background technique [0002] In recent years, domestic coal-fired units have faced a difficult task of peak regulation, and most units have been operating at low load for a long time. The reduction of the load leads to a drop in the exhaust gas temperature of the boiler. When the gas temperature at the outlet of the economizer is too low, the efficiency of the SCR denitrification device will be greatly reduced, and it will even be forced to quit operation. The concentration of ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B01D53/90B01D53/56C02F103/18
CPCB01D53/8631B01D53/90C02F9/00C02F1/441C02F1/12C02F1/048C02F2103/18C02F5/00
Inventor 李飞刘海洋谷小兵陈海杰白玉勇刘忠
Owner DATANG ENVIRONMENT IND GRP
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