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Method and device for multi-grade mixed combustion of double fuels at cyclone state

A combustion device and dual-fuel technology, which is applied in the direction of gaseous fuel and powder fuel combustion, combustion equipment, lighting and heating equipment, etc., can solve the problem of unsatisfactory pulverized coal burnout effect, high NOx content in flue gas, and coal type adaptation Insufficient compatibility and other issues, to achieve the effects of easy access, reduced flue gas NOx emission concentration, and reasonable distribution

Inactive Publication Date: 2015-07-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of small and medium-sized industrial pulverized coal boilers, such as poor coal adaptability, poor flame stability, unsatisfactory pulverized coal burnout effect, and high NOx content in flue gas , the present invention provides a method and device for co-combusting main fuel pulverized coal and high-quality auxiliary fuel in a swirling state

Method used

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  • Method and device for multi-grade mixed combustion of double fuels at cyclone state
  • Method and device for multi-grade mixed combustion of double fuels at cyclone state
  • Method and device for multi-grade mixed combustion of double fuels at cyclone state

Examples

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specific Embodiment 1

[0039] refer to figure 1 , 2 , the swirl burner of the method of the present invention is respectively arranged with auxiliary fuel central delivery pipe (5), central air passage (6), primary air passage (7), inner secondary air passage (8) and outer secondary air passage from inside to outside. Air channel (9). The auxiliary fuel central conveying pipe (5) directs the auxiliary fuel used to the central nozzle (4) at the front end of the burner, and the central air channel (6) is used to direct about 2% of the combustion air from the secondary air main pipe to the front end of the burner The central nozzle of the primary air passage (7) directs the primary air carrying pulverized coal to the primary air nozzle at the front end of the burner, and the inner and outer secondary air passages (8) and (9) direct the secondary air to the secondary air at the front end of the burner spout. The central wind is direct current, the primary air powder is direct current or weak swirl, t...

specific Embodiment 2

[0043] refer to image 3 , the method and the auxiliary fuel nozzle of the burner are respectively arranged at the center of the burner and at the outlet of the external secondary air passage. The injection holes for injecting the first-stage auxiliary fuel are located on the central nozzle (4), and the injection holes for injecting the second-stage auxiliary fuel are located on the outer ring nozzle (10). The difference between this implementation example and the specific implementation example 1 is that a certain number of outer ring nozzles (10) for injecting auxiliary fuel are arranged at the outlet of the outer secondary air passage, and the outer ring nozzles (10) are distributed in a circular shape, such as Figure 4 As shown, they provide the second-stage auxiliary fuel high-speed stream (12) to form the NOx reduction zone (1) as the main purpose, and at the same time can stretch the burner flame, expand the high temperature range of the furnace, and improve the heat e...

specific Embodiment 3

[0046] refer to Figure 5 , the auxiliary fuel nozzles of the burner are respectively arranged at the center of the burner and at the outlet of the outer secondary air channel and distributed in a ring shape. The difference between this implementation example and the specific implementation example 1 is that the second-stage auxiliary fuel, in addition to the high-speed stream (11) provided by the center nozzle hole of the center nozzle (4), also presents a Some auxiliary fuel outer ring nozzles (10) are arranged annularly, and the outer ring second-stage auxiliary fuel high-speed stream (12) is provided through the nozzle holes on the outer ring nozzles (10). The difference from the second implementation example is that the center nozzle is not only provided with a side nozzle but also a center nozzle hole to provide a second-stage auxiliary fuel center high-speed stream (11).

[0047] When the central high-speed stream (11) and the outer ring high-speed stream (12) are inje...

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Abstract

The invention provides a method and a device for multi-grade mixed combustion of double fuels at a cyclone state. On the basis of graded air supplying cyclone combustion, multi-grade mixed combustion of an auxiliary fuel and coal powder is realized and NOx in smoke is reduced: in a process of conveying the coal powder to a combustor, the auxiliary fuel is divided into two grades according to a ratio; a first-grade auxiliary fuel is led into the front end of the combustor to be subjected to the mixed combustion with the coal powder of a concentrated phase, so as to achieve effects of supporting combustion and stabilizing flame of the coal powder; a second-grade auxiliary fuel is conveyed to the tail end of a primary combustion region by a high-speed and small-stream manner to be mixed and combusted with high-temperature smoke at the tail end of the primary combustion region and a secondary combustion region, so as to reduce the NOx generated in the primary combustion region; and proportional control of combustion-supporting air which is fed by grades is matched to guarantee the sufficient combustion of the coal powder and the auxiliary fuels. The method disclosed by the invention can be used for modifying a coal powder cyclone combustor to meet the requirements of the mixed combustion, does not influence the structure and the performance of the combustor and is low in modification cost; and the method can also be used for designing a novel mixed combustion cyclone combustor and the coal powder can be independently combusted when necessary.

Description

Technical field [0001] The present invention involves the field of combustion equipment, and specially involves a method and device of double -fuel multi -level mixed -mixed burn in dual -fuel multi -level mixed -level burn. Background technique [0002] NOX is an important pollution substance of the atmosphere. It will not only form acid rain with serious corrosion effects, but also form acid mist, which seriously affects human health. Therefore, countries around the world have formulated strict emission standards.In modern life and industrial production, coal -fired is one of the main sources of NOX. Some standards have limited the NOX emissions indicators of the flue gas of coal flue boiler to 200mg / nm 3 the following. [0003] There are two main ways to control the NOX of coal -meal combustion, namely: use of flue gas denitrification technology and low nitrogen combustion technology.Although the smoke denitration technology can reduce the NOX content by more than 70%, it can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C1/12F23C7/00
Inventor 张宗旺秦雪刚董博旭侯星慧
Owner UNIV OF SCI & TECH BEIJING
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