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Denitration device with economizer re-circulating system and generator unit

A technology of recirculation system and generator set, applied in the field of denitrification, can solve the problems of increasing investment, system resistance, and rising power consumption of the plant, and achieves the effect of ensuring safe and stable operation, increasing flue gas temperature, and avoiding boiling

Active Publication Date: 2014-09-10
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are the following problems in raising the feed water temperature: 1) For new units, it is relatively easy to implement, but it is also affected by coal quality factors. It needs to be calculated by the main engine factory, and the heat exchange area of ​​the air preheater is increased to absorb the economizer and the previous heat 2) For different units, there are still some doubts about whether there is a suitable steam source to further increase the feed water temperature. The scheme of increasing the feed water temperature has certain restrictions and can only be used on some specific units. ;3) After increasing the feed water temperature, the inlet temperature of the denitrification reactor is increased no matter in the low load condition or the full load condition, and the ammonia injection operation can be performed under the low load condition, but under the full load condition, the temperature is higher than that of the denitrification reactor. In the optimal temperature range, the number of catalysts may also need to be increased, which also increases investment and system resistance, resulting in an increase in plant power consumption

Method used

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  • Denitration device with economizer re-circulating system and generator unit
  • Denitration device with economizer re-circulating system and generator unit
  • Denitration device with economizer re-circulating system and generator unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1: Economizer recirculation scheme is adopted, and the parameters are as follows:

[0069] Economizer inlet water temperature: 260°C;

[0070] Economizer outlet water temperature: 286°C;

[0071] Water supply flow rate of main water supply pipeline: 222.2kg / s;

[0072] Water flow in economizer: 378kg / s;

[0073] Economizer inlet flue gas temperature: 416°C;

[0074] Economizer outlet flue gas temperature: 312°C.

[0075] Among them, the temperature of the water flow introduced into the economizer from the steam turbine through the main water supply pipe on the water side of the economizer is 242°C, and the flow rate is 222.2kg / s. After this part of the water flow is mixed with the water flow introduced from the recirculation system, the economizer The inlet water temperature is 260°C as mentioned above, and the flow rate is 378kg / s. After the flue gas absorbs heat through the water side of the economizer, the temperature of the flue gas changes from 416°C t...

Embodiment 2

[0079] Example 2: Economizer recirculation combined with water side bypass scheme is adopted, and the parameters are as follows:

[0080] Economizer inlet water temperature: 259°C;

[0081] Economizer outlet water temperature: 299.5°C;

[0082] Water supply flow rate of main water supply pipeline: 222.2kg / s;

[0083] Water flow in economizer: 222.2kg / s;

[0084] Economizer inlet flue gas temperature: 416°C;

[0085] Flue gas temperature at the outlet of the economizer: 321°C.

[0086] It can be seen from the above calculation that the flow rate of the recirculation system is about 30% (the ratio of the flow rate introduced by the recirculation system to the flow rate introduced by the main water supply pipe), and at the same time, the feedwater is bypassed to the inlet header of the water wall by about 30%, which can save the economizer The outlet flue gas temperature increases to about 321°C. It can well meet the requirements of ammonia injection temperature.

[0087] F...

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Abstract

The invention relates to a denitration technology, and discloses a denitration device with an economizer re-circulating system for a boiler. The temperature of a water side of an economizer is raised by using the economizer re-circulating system, so that the flue gas temperature of an outlet of the economizer can be raised under the low-load working condition, and requirements on lowermost ammonia spraying under the full-load working condition are met; the flow of the water side of the economizer keeps unchanged or is slightly increased under the control of a circulating pump of the re-circulating system, so that the phenomenon of boiling on the water side of the economizer is avoided, and the economizer can operate safely and stably.

Description

technical field [0001] The invention relates to the technical field of denitrification, in particular to a denitrification device equipped with an economizer recirculation system. Background technique [0002] my country's energy is mainly coal-fired, and the flue gas contains a large amount of sulfur dioxide and nitrogen oxides. Direct emission will cause serious pollution to the atmosphere and affect the health of the society. Environmental pollution has become a major social concern in our country. [0003] According to the requirements of GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants", for new units and existing units, boiler units other than "W" type flame combustion need to achieve the NOx emission limit of less than 100mg / Nm3, for " W" type flame combustion boiler units need to achieve the limit of NOx emission below 200mg / Nm3. [0004] At present, the NOx emission concentration at the furnace outlet of bituminous coal and lignite boilers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56F22D1/12F23J15/02
Inventor 冯琰磊申松林邓文祥施刚夜林磊叶勇健李佩建黄家运
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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