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An integrated transformation method for reducing pollutant emissions from circulating fluidized bed boilers

A pollutant discharge and circulating fluidized bed technology, which is applied in the direction of fluidized bed combustion equipment, combustion methods, and fuel burned in a molten state, can solve the problems of large initial investment in equipment, increased operating costs of enterprises, and long transformation periods. To achieve the effects of short transformation period, avoiding equipment investment and low risk

Active Publication Date: 2016-01-20
HUANENG CLEAN ENERGY RES INST
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But there are also a fair amount of CFB boilers SO 2 and NO x The emission concentration slightly exceeds the standard (only exceeds the standard by 30-100mg / m 3 ), under the background of existing technology, these CFB boilers that exceed the standard should realize SO 2 and NO x To meet the emission standards, it is necessary to install an external desulfurization system and an SNCR denitrification system, which will significantly increase the operating cost of the enterprise and the transformation period will be long, and the initial investment in equipment will be huge

Method used

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  • An integrated transformation method for reducing pollutant emissions from circulating fluidized bed boilers
  • An integrated transformation method for reducing pollutant emissions from circulating fluidized bed boilers
  • An integrated transformation method for reducing pollutant emissions from circulating fluidized bed boilers

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Embodiment 1

[0082] Such as Figure 1 ~ Figure 4 , involving a 480t / h circulating fluidized bed boiler. The boiler before the renovation includes a furnace dense-phase zone 1 and a furnace dilute-phase zone 2. There are 6 furnace inner panel heating surfaces A (left and right sides) in the furnace dilute-phase zone 2. 3 pieces for each wall). Furnace dilute-phase area 2 is connected with separator BA through separator inlet flue B1. There are 2 separators BA in total. The flue gas after separator dust removal enters the tail flue 5 through separator center tube B4. Road heating surface 6, the flue gas is discharged after cooling.

[0083] The combustion temperature in the dense phase zone 1 of the furnace before the transformation is 920°C, the temperature of each point in the dense phase zone 1 of the furnace is 780-1050°C, the differential pressure in the middle of the furnace is 1.2kPa, the differential pressure in the upper part of the furnace is 0.4kPa, and the SO in the flue gas 2 ...

Embodiment 2

[0093] see Figure 14 , involving a 1024t / h circulating fluidized bed boiler. The boiler before the renovation includes a furnace dense-phase zone 1 and a furnace dilute-phase zone 2. In the furnace dilute-phase zone 2, there are 12 furnace inner panel heating surfaces A (left and right sides 6 walls each), and a total of 3 separators BA.

[0094] The combustion temperature of dense-phase zone 1 of the furnace before the transformation was 940°C, the temperature of each point in the dense-phase zone 1 of the furnace was 800-1080°C, the differential pressure in the middle of the furnace was 1.5kPa, the differential pressure in the upper part of the furnace was 0.6kPa, and the SO in the flue gas 2 The emission concentration is 300~500mg / m 3 , NO x The emission concentration is 210~250mg / m 3 . The total air volume of the boiler is 950000Nm 3 / h, the primary air DP of the boiler is 550000Nm 3 / h, the wind cap C2 adopts a bell-shaped wind cap, the resistance of the air distri...

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Abstract

The invention discloses an integrated modification method for reducing pollutant emission of a circulating fluidized bed boiler. The modification method comprises the following steps: modifications on a screen type heating surface, a material return system, an air distribution system, a secondary air nozzle system, a slag cooling system and a desulfurizer adding system. Through the modifications, the concentration of SO2 and NOx in smoke is finally reduced to 30-70% of that before modifications, the fly ash concentration is reduced to 70-90% of that before modifications and the environmental protection characteristic of boiler operation can be remarkably improved without adding new equipment. The integrated modification method has the advantages of being small in investment cost, short in modification period and stable in boiler operation; at the time the integrated modification is performed, the problems existing in arrangement of the original heat surface, a funnel cap, a separator, a slag cooler and a lime stone transmission system of the boiler can be synchronously solved, and therefore the economy, stability and safety performance of boiler operation are comprehensively improved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection transformation of circulating fluidized bed boilers, and in particular relates to an integrated transformation method for reducing pollutant discharge of circulating fluidized bed boilers. Background technique [0002] Circulating Fluidized Bed (CFB) boiler technology has developed rapidly at home and abroad because of its superior environmental protection performance and good fuel adaptability, and its maximum capacity has reached 600MW supercritical level. At present, the main unit of domestic CFB boilers has grown to 300MW, and China is already the country with the largest number of CFB boilers in operation and the largest installed capacity in the world. Due to the short application time of CFB boilers in China, they mainly use low-quality fuels, which have low calorific value, high sulfur content, high ash content, and are difficult to burn, while their own flow characteristi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/10F23C10/18F23C10/26
Inventor 黄中徐正泉江建忠肖平孙献斌
Owner HUANENG CLEAN ENERGY RES INST
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