Cyclone separator of circulating fluidized bed boiler with double eccentric central cylinders

A technology of cyclone separator and circulating fluidized bed, which is applied in the direction of fluidized bed combustion equipment, fuel burned in a molten state, lighting and heating equipment, etc., and can solve the problem of insufficient circulating ash, high carbon content in fly ash, and affecting boilers Operation and other issues, to achieve the effect of improving separation efficiency, high separation efficiency, and optimizing boiler operating conditions

Inactive Publication Date: 2014-10-08
HUANENG CLEAN ENERGY RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Judging from the actual use of circulating fluidized bed boilers in China, problems such as high carbon content in fly ash caused by low separation efficiency and insufficient circulating ash affect boiler operation often occur. Some boiler fly ash carbon content is as high as 5%~ 20%, limestone calcium sulfur molar ratio as high as 4 to 8

Method used

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  • Cyclone separator of circulating fluidized bed boiler with double eccentric central cylinders
  • Cyclone separator of circulating fluidized bed boiler with double eccentric central cylinders
  • Cyclone separator of circulating fluidized bed boiler with double eccentric central cylinders

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A new 130t / h circulating fluidized bed boiler, see Figure 1 to Figure 6 , the two cyclone separators of the boiler are equipped with double eccentric central tubes. The separator cylinder 2 is respectively connected with the inlet flue 1 and the separator cone 3, the separator riser 4 is arranged at the lower part of the separator cone 3, and the double eccentric central cylinder 5 is inserted into the separator cylinder 2 from the upper part.

[0050] The speed of the flue gas at the flue gas end speed increasing port 6 of the inlet flue 1 can reach 25m / s, and the distance x between the entrance of the flue gas end speed increasing port 6 close to the separator cylinder 2 is 0.1 times the length y of the inlet flue 1 .

[0051] In order to improve the separation efficiency, there is a distance difference e1 between the upper surface circle center od1 of the double eccentric central cylinder 5 and the upper surface circle center oD of the separator cylinder body 2, wh...

Embodiment 2

[0054] A 240t / h circulating fluidized bed boiler in service, see Figure 1 to Figure 6 , The central tube of the two cyclone separators of the boiler adopts a conventional design. During operation, the load capacity is insufficient, the boiler output is generally only 75%, the ash concentration in the furnace is low, the pressure difference in the suspension section is only 800Pa, and the bed temperature cannot be effectively adjusted. The bed temperature in daily operation exceeds 980°C, SO 2 Emission concentration 600mg / m 3 , NO X Emission concentration 400mg / m 3 , the calcium-sulfur molar ratio of limestone is as high as 5-6, the efficiency of the separator is low, and the effective circulation of materials cannot be realized. The measured median particle size of boiler fly ash is 90 μm.

[0055] Replace the original central cylinder of the boiler with a double eccentric central cylinder. There is a distance difference e1 between the upper surface circle center od1 of th...

Embodiment 3

[0059] A new 1000t / h circulating fluidized bed boiler, see figure 1 ~ Figure 5 and Figure 7 , the three cyclone separators of the boiler are arranged on both sides of the furnace, and the central cylinder of the cyclone separator adopts a double eccentric central cylinder 5.

[0060] The inlet flue 1 is equipped with a flue gas end speed increasing port 6, and the speed of the flue gas at the flue gas end speed increasing port 6 can reach 30m / s.

[0061] There is a distance difference e1 between the upper surface circle center od1 of the double eccentric center cylinder 5 of the three separators and the upper surface circle center oD of the separator cylinder body 2. There is a distance difference e2 of 100mm between them.

[0062] The overall resistance of the cyclone separator is 1.4kPa, and the separation efficiency is 99.95%.

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Abstract

The invention discloses a cyclone separator of a circulating fluidized bed boiler with double eccentric central cylinders. The cyclone separator comprises a separator cylinder body, a separator conical body and a separator vertical pipeline which are communicated in sequence from top to bottom, the side part of the separator cylinder body is communicated with an inlet flue; the connecting part between the bottom of the inlet flue and the separator cylinder body is sunken inwards to form a smoke tail end accelerating opening; the double eccentric central cylinders are inserted into the top of the separator cylinder body. According to the cyclone separator of the circulating fluidized bed boiler with the double eccentric central cylinders, the separating efficiency of the cyclone separator is improved; the material circulating manner is optimized; the material concentration in a furnace hearth is improved; the bed temperature of a dense phase area of the boiler is reduced; the emission concentration of SO2 and NOx is reduced; the environment friendliness and economy of operation of the circulating fluidized bed boiler are improved; the cyclone separator of the circulating fluidized bed boiler with the eccentric central cylinders is suitable for integrated modification of newly-built machine units and on-service machine units.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed boilers, and in particular relates to a cyclone separator for circulating fluidized bed boilers with double eccentric central cylinders. Background technique [0002] The separator is one of the key components of the circulating fluidized bed boiler. Its main function is to separate a large amount of high-temperature solid materials from the air flow and send them back to the furnace to maintain the rapid fluidized operation of the furnace. Ensure multiple cycles of fuel and desulfurizer, which provides conditions for prolonging the residence time of coke particles and desulfurizer. [0003] The circulating fluidized bed boiler separator must meet several requirements: (1) It can work normally at high temperature; (2) It can separate the high-concentration particle-carrying airflow, and the solid particle concentration at the separator inlet reaches 0.5-5kg / m 3 ; ⑶ has a lower r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/18
Inventor 黄中孙献斌肖平徐正泉江建忠
Owner HUANENG CLEAN ENERGY RES INST
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