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Circulating fluidized bedboiler cyclone separator provided with entirely inclined center cylinder

A cyclone separator and circulating fluidized bed technology, which is applied to fluidized bed combustion equipment, fuel burned in a molten state, lighting and heating equipment, etc., can solve the problem of low separation efficiency of the separator, large consumption of limestone, and the High separation efficiency, low difficulty in manufacturing and on-site installation, and reduced median particle size of fly ash

Active Publication Date: 2014-10-15
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of practical application, there are generally problems such as low separation efficiency of the separator, high median diameter of fly ash, and large consumption of limestone.

Method used

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  • Circulating fluidized bedboiler cyclone separator provided with entirely inclined center cylinder
  • Circulating fluidized bedboiler cyclone separator provided with entirely inclined center cylinder
  • Circulating fluidized bedboiler cyclone separator provided with entirely inclined center cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A new 240t / h circulating fluidized bed boiler, see figure 1 , figure 2 , image 3 , Figure 4 and Figure 5, the central cylinder of the two cyclone separators of the boiler adopts the overall inclined method, the outlet area of ​​the flue 1 of the tapered inlet of the cyclone separator is 60% of the inlet area, and the flue gas discharged from the furnace can reach 26m / s after being accelerated, and the tapered The inlet flue 1 is equipped with a flue gas equalizing boss 6, and the thickness of the protruding part of the flue gas equalizing boss 6 is 800mm. The distance difference e between the cylinder geometric center a of the central cylinder 5 and the vertical center b of the upper surface of the overall inclined central cylinder 5 is 150mm, and the angle c between the overall inclined central cylinder 5 and the airflow direction is 60°, and the overall inclined central cylinder 5. The depth h of inserting the separator is 20% of the height H of the separator ...

Embodiment 2

[0054] For a 480t / h circulating fluidized bed boiler in service, the central cylinder 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 60% to 75%, the ash concentration in the furnace is low, the pressure difference in the suspension section is only 500Pa, and the bed temperature cannot be effectively adjusted. 2 Emission concentration 600mg / m 3 , NO X Emission concentration 400mg / m 3 , the molar ratio of calcium to sulfur in 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 110μm, and the separator resistance is 600Pa.

[0055] refer to figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , the central cylinder of the boiler cyclone separator is replaced and transformed by adopting the overall tilting method of the cent...

Embodiment 3

[0057] A new 720t / h circulating fluidized bed boiler, see figure 1 , figure 2 , image 3 , Figure 4 and Image 6 , the center tubes of the three cyclone separators of the boiler adopt an overall tilting method, and the top fixing method of the overall tilting center tube 5 is a free-hanging fixing method, which is freely matched with the separator tube body 2 and can slide relative to each other in a hot state. Expansion dead point,; the outlet area of ​​the tapered inlet flue 1 of the cyclone separator is 55% of the inlet area, and the flue gas discharged from the furnace can reach 24m / s after acceleration, and the tapered inlet flue 1 is equipped with flue gas equalization Boss 6, from Image 6 The thicknesses of the protruding parts of the flue gas equalizing boss 6 of the three separators from top to bottom are 600mm, 800mm and 600mm respectively; in order to improve the separation efficiency, the geometric center a of the central cylinder 5 of the three separators i...

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Abstract

The invention relates to a circulating fluidized bedboiler cyclone separator provided with an entirely inclined center cylinder. The circulating fuidized bedboiler cyclone separator comprises a shrinking inlet flue, wherein the outlet of the shrinking inlet flue is connected with the side surface inlet of a separator barrel; the lower end outlet of the separator barrel is connected with the upper end inlet of a separator cone; the lower end outlet of the separator cone is connected with a separator vertical pipe; the entirely inclined center cylinder is inserted into the separator barrel from the upper part of the separator barrel; a flue gas current-sharing boss is mounted inside the outlet of the shrinking inlet flue; the top of the entirely inclined center cylinder is fixed in a free hanging manner; the entirely inclined center cylinder is freely fitted with the separator barrel. According to the invention, the entirely inclined center cylinder is arranged, flow field in the cyclone separator can be optimized, the flue gas current-sharing boss can enable the flow field to be stable, particles carried by flue gas is uniform in concentration, and the separating efficiency of the cyclone separator can be improved.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed boilers, and in particular relates to a circulating fluidized bed boiler cyclone separator with an integrally inclined central cylinder. technical background [0002] The circulating fluidized bed boiler must pass through the gas-solid separation and return device to complete the circulation of materials in the main circulation loop. It must ensure a certain amount of circulation during operation, which puts forward requirements on the separation efficiency of the gas-solid separation device. . The cyclone separator is a gas-solid separation device commonly used in circulating fluidized bed boilers. Generally speaking, the design of circulating fluidized bed boiler cyclone separators should meet the following requirements: [0003] ⑴The cyclone separator should be able to work normally for a long time in the environment of high temperature, high concentration and high flow; [...

Claims

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Application Information

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IPC IPC(8): F23C10/18
Inventor 黄中徐正泉江建忠肖平孙献斌
Owner HUANENG CLEAN ENERGY RES INST
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