A high-efficiency and low-nox segmental coupled combustion method for inferior coal

A combustion method and low-quality coal technology, applied in the direction of combustion method, graded combustion, combustion type, etc., can solve the problems of low NOx emission and high combustion efficiency at the same time, and achieve the effect of non-slagging load response and low NOx combustion

Active Publication Date: 2018-09-07
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims to solve the problem that the existing coal combustion technology cannot realize low NOx emission and high combustion efficiency at the same time when low-quality coal is used as fuel, and the problem that a coal grinding system needs to be equipped in the combustion process provides a segmented coupling of low-quality coal with high efficiency and low NOx burning method

Method used

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  • A high-efficiency and low-nox segmental coupled combustion method for inferior coal
  • A high-efficiency and low-nox segmental coupled combustion method for inferior coal
  • A high-efficiency and low-nox segmental coupled combustion method for inferior coal

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specific Embodiment approach 1

[0047] Specific implementation mode one: see figure 1 , figure 2 and Figure 4 Describe this embodiment, a high-efficiency and low-NOx segmented coupling combustion method for inferior coal described in this embodiment is realized by a high-efficiency and low-NOx segmental coupling combustion device for inferior coal, and the high-efficiency and low-NOx segmental coupling of the inferior coal The combustion device includes N fluidized beds 1 and a pulverized coal furnace 2, and the raw gas output pipes 1-15 of the N fluidized beds 1 are all communicated with the crude gas burner 2-4 of the pulverized coal furnace 2, and N is greater than or an integer equal to 1,

[0048] The fluidized bed 1 includes three reaction zones, which are dense phase zone 1-11, cyclone separation zone 1-12 and dilute phase zone 1-13 from bottom to top,

[0049] A central cone 1-8 is provided at the bottom of the fluidized bed 1, and a louver 1-14 is provided at the top, and both the central cone ...

specific Embodiment approach 2

[0070] Specific implementation mode two: see figure 1 , figure 2 and Figure 4 To illustrate this embodiment, the difference between this embodiment and the high-efficiency, low-NOx staged coupling combustion method for low-quality coal described in Embodiment 1 is that the area where the crude gas burner 2-4 is located is a reducing atmosphere rich The fuel combustion zone 2-2, the area above where the crude gas burner 2-4 is located is the oxidizing atmosphere lean fuel burnout zone 2-3.

[0071] In this embodiment, the crude gas nozzle 2-5a of the pulverized coal furnace 2 communicates with the crude gas output pipe 1-15 of the fluidized bed 1, and multiple groups of crude gas burners 2-4 need to be configured. Gas burners 2-4 are configured in 4 groups.

[0072]4 groups of crude gas burners 2-4 are arranged in a reducing atmosphere fuel-rich combustion area 2-2 in a tangential manner, and are used for the combustion of crude gas 1100°C in a reducing atmosphere rich in ...

specific Embodiment approach 3

[0075] Specific implementation mode three: see figure 1 , figure 2 and Figure 4 This embodiment is described. The difference between this embodiment and the high-efficiency, low-NOx staged coupled combustion method for low-quality coal described in Embodiment 1 is that:

[0076] In step 1, the air distribution method of injecting the fluidizing air nozzles 1-4 into the fluidizing air is as follows: the fluidizing air is arranged tangentially around the bed bottom of the fluidized bed 1, and the adjacent two fluidizing air in the same layer Air flow nozzle 1-4 jet cross;

[0077] In step 1, the air distribution method of the crushing air nozzles 1-5 injected into the crushing wind is: the jet direction of all the crushing air nozzles 1-5 in the same layer is perpendicular to the symmetry axis of the central cone 1-8, and the same The jets of two opposing crushing air nozzles 1 - 5 in a layer collide with each other.

[0078] In Step 1, the Mach number Ma of the outlet air...

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Abstract

The invention provides a high-efficiency low-NOx staged coupling combustion method for inferior coal, belongs to the technical field of high-efficiency clean coal combustion and aims to solve the problems that an existing coal combustion technology is incapable of simultaneously realizing low NOx emission and high combustion efficiency and needs to be provided with a coal grinding system during a combustion process of an inferior coal fuel. The high-efficiency low-NOx staged coupling combustion method provided by the invention is mainly composed of a fluidized bed and a pulverized coal furnace; the combustion process comprises the following steps: firstly, performing fuel-rich pyrolysis, adiabatic combustion, crushing, gasification and particle separation on coal particles in the fluidized bed; reforming the fuel into raw gas which is at a temperature of 850 to 900 DEG C and only contains particles of which the particle size is equal to or smaller than 75 micrometers; subsequently sending the raw gas to a combustor region of the pulverized coal furnace and performing fuel-rich combustion at the temperature of 1100 DEG C; finally performing fuel-lean after-combustion at the temperature of 1300 DEG C in the upper region of the combustor of the pulverized coal furnace, wherein the three stages of combustion are controlled relatively-independently and are effectively coupled by virtue of a new structure in the furnace. The method provided by the invention is mainly applied to the field of combustion of inferior coal.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency clean coal combustion. Background technique [0002] In China, the proportion of thermal power directly burning coal for power generation is as high as 70%. Among them, the vast majority of thermal power plants burn low-quality coal, and the proportion of low-quality coal in my country's proven mineable coal reserves reaches about 50%. Only anthracite The ratio of high-quality anthracite and lean coal is close to 30%, and there are very few high-quality anthracite and lean coal; more and more low-quality coal is imported. Although a variety of coal-fired technologies with their own characteristics have been developed at home and abroad, which are reflected in the combustion of difficult-to-burn low-volatile anthracite, lean coal, coke, and three-high coal, due to the realization of stable combustion, high efficiency, low NOx, The conditions of no slagging and fast load response often restr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C1/12F23C7/02C10J3/48
CPCC10J3/485C10J2300/0956C10J2300/0976F23C1/12F23C7/02F23C2201/101F23C2900/01001
Inventor 孙锐邢春礼赵广播朱文堃
Owner HARBIN INST OF TECH
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