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Coal-fired power plant boiler device and method of using the denitrification system when it is ignited

A technology for coal-fired boilers and coal-fired power stations, which is applied in the direction of combustion methods, steam boilers, and combustion technology mitigation. It can solve the problem that it is not a boiler, it takes more than 3 hours, and sometimes it takes more than 10 hours, which cannot be satisfied, and achieves uniform temperature rise. , shorten the start-up time and save fuel consumption

Active Publication Date: 2019-04-02
JIANGSU FRONTIER ELECTRIC TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the ammonia injection denitrification can only be put into operation at a minimum of 30~40% of the rated load of the unit, which belongs to the normal operation load and put into operation for denitrification
Although the flue gas bypass technology can spray ammonia for denitrification when the unit is connected to the grid, it still cannot spray ammonia for denitrification when the boiler is ignited.
It takes more than 3 hours, and sometimes more than 10 hours, from the time the boiler is ignited to the time when the heat load of the boiler increases to the point where the denitrification SCR system can be put into use. The requirements of GB13223-2011 cannot be met during this period

Method used

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  • Coal-fired power plant boiler device and method of using the denitrification system when it is ignited
  • Coal-fired power plant boiler device and method of using the denitrification system when it is ignited

Examples

Experimental program
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Effect test

no. 1 example

[0025] The first embodiment: as figure 1 as shown,

[0026]A coal-fired power plant boiler device that uses a denitrification system when it is ignited according to the present invention includes a coal-fired boiler 1, a denitrifier 2, a desulfurization tower 3 and a chimney 4 connected in sequence, and the flue gas passing through the coal-fired boiler 1 passes through the denitrification in sequence 2, desulfurization tower 3 and chimney 4, among which: boiler economizer 5 is installed at the end of the tail flue of coal-fired boiler 1, a boiler circulating water cooling system 6 is connected to the inlet pipe of boiler economizer 5, boiler circulating water cooling system 6. An external heating source is set. The water-cooled wall tubes of the boiler circulating water cooling system 6 form the furnace of the coal-fired boiler 1. A valve is installed on the connecting pipe between the boiler circulating water cooling system 6 and the inlet pipe of the boiler economizer 5 to ...

no. 2 example

[0034] The second embodiment: as figure 2 as shown,

[0035] In the embodiment, the coal-fired boiler 1 is a once-through boiler, and the circulating water cooling system 6 of the once-through boiler includes a steam-water separator forming a circuit, a starting circulating pump, and water-cooled wall tubes, and the water-cooled wall tubes are arranged around the boiler to form the furnace of the coal-fired boiler 1. Boiler economizer 5 water is sent to the water wall, and the external heating source is connected to the boiler feed water by the adjacent steam heating system arranged on the high-pressure heater, and a valve is set at the connection between the high-pressure heater and the external heating source, and the valve controls the high-pressure heater Whether it is connected with the external heating source, the external heating source is the exhaust steam of the high pressure cylinder of the adjacent unit.

[0036] A method for using a coal-fired power plant boiler ...

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Abstract

The invention discloses a coal-fired power station boiler capable of putting a denitrification system into service instantly during ignition. A boiler coal economizer is arranged in a smoke channel of a coal-fired boiler and is connected with a circulation water cooling system, wherein the circulation water cooling system is connected with an external heating source; a water cooling tube of the circulation water cooling system is used as a boiler hearth of the coal-fired boiler; an air preheater and a low-temperature coal economizer front section are also successively connected between the boiler coal economizer and a denitrator; an air heater is mounted in an air channel of the air preheater; a heat exchange tube of the air heater and the external heating source form a loop; a front section of the heat exchange tube is arranged in the low-temperature coal economizer front section and is connected with the external heating source. The coal-fired power station boiler has the advantages that the smoke can meet the smoke temperature requirement of the denitrification system during ignition of the boiler, and the requirement of GB13223-2011 can be completely met.

Description

technical field [0001] The invention belongs to the technical field of SCR flue gas denitrification of coal-fired power boilers, and in particular relates to a coal-fired power plant boiler device and a method for using the denitrification system immediately after ignition. Background technique [0002] According to the regulations of GB13223-2011, the coal-fired boilers of thermal power plants must meet the air pollution-free emission standards under any circumstances, realize the denitrification operation under the full operating conditions of the boilers, and meet the NOx emission concentration standards. At present, the flue gas denitrification SCR system of coal-fired power generation boilers uses high-temperature catalysts, and the suitable flue gas temperature range is between 420 and 280°C. It is generally arranged between the economizer and the air preheater. Satisfy the conditions for the denitrification system to inject ammonia into operation. The current full-lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23J15/00F23J15/02F23J15/06F23J15/08F22B31/08
CPCF22B31/08F23J15/003F23J15/006F23J15/02F23J15/06F23J15/08F23J2215/10F23J2215/20Y02E20/30
Inventor 肖杰丁建良黄磊管诗骈张恩先岳峻峰徐颂梅马新立邹磊卢承斌
Owner JIANGSU FRONTIER ELECTRIC TECH
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