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Method for preventing coking of circular fluidization bed boiler

A circulating fluidized bed and boiler technology, applied in fluidized bed combustion equipment, chemical instruments and methods, combustion methods, etc., can solve problems affecting the development of circulating fluidized bed boilers, affecting the safe and economic operation of boilers, and shortening boiler operation cycles problems, to achieve the effect of improving the classification effect, preventing the clogging of the sieve holes, and improving the combustion efficiency

Active Publication Date: 2019-08-09
ZIBO QILIN GUIHE THERMOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, coking of circulating fluidized bed boilers is the most common and serious problem. If it is not handled well, it will seriously affect the safe and economical operation of the boiler, and also affect the further development and application of circulating fluidized bed boilers. After coking occurs in the boiler, the boiler can only be forced to shut down; the coking of the boiler will shorten the boiler operation cycle, increase the cost of starting and stopping, and damage the refractory materials. To prevent the coking of the circulating fluidized bed boiler, it is necessary to ensure good and Stable furnace coal quality, especially particle size, fineness and other indicators must be strictly controlled, the proportion of coal with different particle sizes fed to circulating fluidized bed boilers in the prior art needs to be improved, and at the same time

Method used

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  • Method for preventing coking of circular fluidization bed boiler
  • Method for preventing coking of circular fluidization bed boiler
  • Method for preventing coking of circular fluidization bed boiler

Examples

Experimental program
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Embodiment 1

[0049] This embodiment provides a method for preventing coking in a circulating fluidized bed boiler, comprising the following steps:

[0050] S1. The quality of incoming coal enters the pretreatment device:

[0051] 1 Coarse crushing: the coal to be fed into the furnace is sent to the driven crushing roller in the casing for coarse crushing, and the particle size after coarse crushing is between 0 and 30mm;

[0052] 2. Primary screening: The coarsely crushed coal to be fed into the furnace is screened through a primary vibrating screen, and the particle size is between 0 and 10 mm after screening;

[0053] 3 Drying: Send the coal after primary screening to the drying device, adjust the temperature to between 50 and 80 degrees, and the drying time is 3 minutes;

[0054] 4 Fine crushing: the dried coal to be fed into the furnace is finely crushed by the fine crushing mechanism, and the particle size after fine crushing is between 0 and 4mm;

[0055] 5 Secondary screening: The...

Embodiment 2

[0072] This embodiment provides a method for preventing coking in a circulating fluidized bed boiler, comprising the following steps:

[0073] S1. The quality of incoming coal enters the pretreatment device:

[0074] 1 Coarse crushing: the coal to be fed into the furnace is sent to the driven crushing roller in the casing for coarse crushing, and the particle size after coarse crushing is between 0 and 30mm;

[0075] 2. Primary screening: The coarsely crushed coal to be fed into the furnace is screened through a primary vibrating screen, and the particle size is between 0 and 10 mm after screening;

[0076] 3 Drying: Send the first-stage sieved coal into the drying device, adjust the temperature to between 50 and 80 degrees, and the drying time is 5 minutes;

[0077] 4 Fine crushing: the dried coal to be fed into the furnace is finely crushed by the fine crushing mechanism, and the particle size after fine crushing is between 0 and 4mm;

[0078] 5 Secondary screening: The fi...

Embodiment 3

[0095] This embodiment provides a method for preventing coking in a circulating fluidized bed boiler, comprising the following steps:

[0096] S1. The quality of incoming coal enters the pretreatment device:

[0097] 1 Coarse crushing: the coal to be fed into the furnace is sent to the driven crushing roller in the casing for coarse crushing, and the particle size after coarse crushing is between 0 and 30 mm;

[0098] 2. Primary screening: The coarsely crushed coal to be fed into the furnace is screened through a primary vibrating screen, and the particle size is between 0 and 10 mm after screening;

[0099] 3 Drying: Send the first-stage sieved coal into the drying device, adjust the temperature to between 50 and 80 degrees, and the drying time is 5 minutes;

[0100] 4 Fine crushing: the dried coal to be fed into the furnace is finely crushed by the fine crushing mechanism, and the particle size after fine crushing is between 0 and 4mm;

[0101] 5 Secondary screening: The f...

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Abstract

The invention discloses a method for preventing coking of a circular fluidization bed boiler, and belongs to the technical field of circular fluidization bed boilers. The method for preventing cokingof the circular fluidization bed boiler comprises the following steps that coal as fired enters a pretreatment device; the coal as fired is subjected to coarse crushing, primary screening, drying, fine crushing, secondary screening and the like; the fine crushed coal is subjected to screening by a secondary vibration screen, and the particle size of the coal is between 0 and 1 mm after screening;the coal as fired is charged; high-melting-point material powder is jetted into a furnace hearth by a jetting device; the boiler is cleaned after halting cooling; by adopting the method, coal of different particle sizes is conveyed into the circular fluidization bed boiler according to an accurate ratio; excessive moisture in the raw coal is dried; the problem of over-crushing of the coal during afine crushing process is avoided; a combustion improver which is accurately prepared is added, so that fullness of coal combustion is improved; and the occurring probability of the coking problem islowered.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a method for preventing coking of circulating fluidized bed boilers. Background technique [0002] Circulating fluidized bed boiler is the clean coal combustion technology with the highest degree of industrialization; circulating fluidized bed boiler adopts fluidized combustion, and its main structure includes combustion chamber (including dense phase area and dilute phase area) and circulating furnace (including high temperature gas-solid separation The biggest difference from the bubbling fluidized bed combustion technology is that the operating wind speed is high, which strengthens the heterogeneous reaction process such as combustion and desulfurization, and the boiler capacity can be expanded to a large capacity acceptable to the power industry (600MW or above level) At present, circulating fluidized bed boilers have well solved basic problems such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/22F23K1/00B02C4/08B07B1/28
CPCB02C4/08B07B1/28F23C10/22F23K1/00
Inventor 不公告发明人
Owner ZIBO QILIN GUIHE THERMOELECTRIC
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