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Sharing and resource utilization system and method of high-calcium fly ash for multi-unit plant

A high-calcium fly ash and multi-unit technology, applied in the field of high-calcium fly ash sharing and resource utilization systems, can solve problems such as waste, unused CaO, and difficult comprehensive utilization

Pending Publication Date: 2017-06-20
FUJIAN LONGKING DSDN ENGINEERING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the CaO content in high-calcium fly ash is significantly higher than the national standards for brick and concrete, and even higher than the upper limit required by brick and concrete manufacturers. It is difficult to comprehensively utilize, and usually can only be stored in ash yards processing, causing a large amount of CaO to be unused and wasted in vain

Method used

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  • Sharing and resource utilization system and method of high-calcium fly ash for multi-unit plant
  • Sharing and resource utilization system and method of high-calcium fly ash for multi-unit plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] High-calcium fly ash sharing and resource utilization system for multi-unit power station

[0069] This embodiment provides a kind of figure 1 The high-calcium fly ash sharing and resource utilization system of the multi-unit power station shown includes circulating fluidized bed boilers arranged in sequence along the flue gas flow direction, pre-dust collector 1, high-calcium fly ash distribution system 2, circulation Fluidized bed dry desulfurization absorption tower 31, post dust collector 32, induced draft fan 4 and chimney.

[0070] In this embodiment, the ash outlets of the pre-dust collectors 1 of multiple units are connected with a first-level distribution and conveying device A1, and the outlet of the first-level distribution and conveying device A1 of each unit is connected in parallel with an outer discharge conveying adjustment device A21 and a central discharge adjustment device A21. Storage and transportation adjustment device A22; each unit's external di...

Embodiment 2

[0080] In the system provided in Embodiment 1, the high-calcium fly ash sharing and resource utilization of a multi-unit power station is carried out. Taking a single 300MW unit of a certain power station as an example, the specific implementation is as follows:

[0081] The 300MW-scale circulating fluidized bed boiler provides raw flue gas. When the furnace is not desulfurized, the raw flue gas SO 2 The concentration is 2000mg / Nm 3 , SO in the raw flue gas after desulfurization in the furnace 2 The concentration is 480mg / Nm 3 , the flue gas temperature is 138°C, and the flue gas volume is 1,750,000m 3 / h. The CaO content in the high-calcium fly ash after furnace desulfurization is 15-23wt%. Transport high-calcium fly ash into the absorption tower, keep the operating temperature of the absorption tower at 85°C during operation, the pressure drop of the absorption tower bed layer is 1.1kPa, the consumption of high-calcium fly ash is 6.5t / h and the water consumption of the a...

Embodiment 3

[0083] In the system provided in Example 1, the high-calcium fly ash sharing and resource utilization of multi-unit power plants are carried out. Taking a self-provided power plant with 6×100MW circulating fluidized bed boiler units as an example, the sulfur dioxide content at the chimney inlet The requirement is not higher than 35mg / Nm 3 , the specific implementation is as follows:

[0084] Flue gas volume of each 100MW boiler working condition is 810000m 3 / h, wet standard flue gas volume 490000m 3 / h, dry standard flue gas volume 450000m 3 / h, SO in the raw flue gas without desulfurization in the furnace 2 The concentration is 4000mg / Nm 3 , the fly ash concentration in the raw flue gas is 20000mg / Nm when the furnace is not desulfurized 3 .

[0085] According to the test results of desulfurization in the furnace, when the calcium-sulfur ratio of desulfurization in the furnace is 1.0, the desulfurization efficiency in the furnace is 50%, and the CaO content in the fly a...

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Abstract

The invention belongs to the field of flue gas treatment, in particular relates to a sharing and resource utilization system and method of high-calcium fly ash for a multi-unit plant. Each unit of the system comprises a circulating fluidized bed boiler, a front-mounted dust remover, a circulating fluidized bed dry process desulfurization absorbing tower, a rear-mounted dust remover and an induced draft fan, wherein all units share one set of high-calcium fly ash distribution system; the high-calcium fly ash distribution system can feed fly ash collected by the front-mounted dust removers into the circulating fluidized bed dry process desulfurization absorbing towers or externally discharge the fly ash according to the content of calcium oxide of the fly ash. According to the system, the high-calcium fly ash is used as a desulfurizing agent used in a circulating fluidized bed dry process desulfurization process, and the amount of the high-calcium fly ash which is introduced into the circulating fluidized bed dry process desulfurization absorbing towers of a plurality of power generator units and the amount of low-calcium fly ash which is externally discharged to a fly ash storehouse are selected and controlled by utilizing the high-calcium fly ash distribution system according to desulfurization requirements of the plurality of power generator units and the content of the calcium oxide of the fly ash, so that on-site high-efficient resource utilization of the high-calcium fly ash is realized.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and in particular relates to a high-calcium fly ash sharing and resource utilization system and method for a multi-unit power station. Background technique [0002] The circulating fluidized bed boiler has the advantages of wide fuel adaptability, strong load regulation ability and low pollutant emission concentration. However, 25% of my country's coal resources are high-sulfur coal with a sulfur content exceeding 2%, and the accumulated coal gangue has reached 1.5 billion tons. CFB boilers have a huge application market in my country. Since the introduction from abroad, my country's circulating fluidized bed boiler technology has been developing continuously. At present, my country has the largest number of 300MW circulating fluidized bed boilers in the world, and the world's largest 600MW circulating fluidized bed boiler. [0003] Since the combustion temperature of the circulating fluidized ...

Claims

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Application Information

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IPC IPC(8): B01D53/81B01D53/50F23C10/18F23J15/02F23J15/00
CPCB01D53/508F23C10/18F23J15/006F23J15/02B01D2258/0283
Inventor 郭志航陈树发詹威全林春源陈泉森贺艳艳朱振炜张原王建春林敏
Owner FUJIAN LONGKING DSDN ENGINEERING CO LTD
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