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Low NOx Combustion Method and Low NOx Combustion System

A combustion system and combustion method technology, applied in the field of low NOx combustion method and low NOx combustion system, can solve the problems affecting the universality, no source of ultra-fine coal powder, increased carbon content of flue gas fly ash, etc., and achieve high NOx The effect of emission reduction rate

Active Publication Date: 2018-09-21
YANTAI LONGYUAN POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] For example, the Chinese patent CN1240965C uses the flue gas to transport the ultra-fine powder from the powder feeder to the reburning zone after the main combustion zone in the furnace for reburning and denitrification. The main burning zone and the reburning zone are artificially isolated, and the reburning zone is too close to the furnace outlet. As a result, the carbon content of flue gas fly ash increases, and it is difficult to adjust and manage the coordinated operation of different powder feeding methods, which affects the versatility of the application of this technology
Moreover, ultra-fine powder is more convenient for power plant boilers with a small capacity mid-storage pulverizing system (ultrafine pulverized coal in the tertiary air), but large-capacity boilers use direct blowing pulverizing systems for safety and land occupation considerations. Therefore, there is no large and stable source of ultra-fine coal

Method used

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  • Low NOx Combustion Method and Low NOx Combustion System

Examples

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Effect test

no. 1 example

[0042] figure 1 It is a schematic diagram of the arrangement structure of the low NOx combustion system of the first embodiment of the present invention. The low NOx combustion system of the first embodiment includes a furnace body, a plasma reactor 21, a gas-solid separator 31, a reburning burner 41, a residual carbon burner 51, a pulverized coal burner 61, an overfired air nozzle 71 and a pre-combustion Exhaust the wind spout 72. Wherein, the space inside the furnace body forms a furnace 91 . The furnace 91 has a central axis 81 of the furnace, and the central axis 81 of the furnace is arranged vertically.

[0043] Reburning burner 41 , residual carbon burner 51 , pulverized coal burner 61 , pre-burned-out air spout 72 and burn-out air spout 71 are all installed on the body of heater and lead in the furnace 91 .

[0044] In the first embodiment, the pulverized coal burner 61 is divided into two layers: the lower pulverized coal burner and the upper pulverized coal burner;...

no. 2 example

[0086] figure 2 It is a schematic diagram of the arrangement structure of the low NOx combustion system of the second embodiment of the present invention.

[0087] Such as figure 2 As shown, the low NOx combustion system of the second embodiment includes a furnace body, a plasma reactor 21, a gas-solid separator 31, a reburning burner 41, a residual carbon burner 51, a pulverized coal burner 61 and an overfired air nozzle 71 . Wherein, the space inside the furnace body forms a furnace 91 . Reburning burner 41, residual carbon burner 51, pulverized coal burner 61, burn-off air spout 71 are all installed on the body of heater and lead in the hearth 91. The furnace chamber 91 has a furnace center axis 81 and the plasma reactor 21 has a reactor center axis 11 .

[0088] In the second embodiment, the pulverized coal burner 61 is divided into two layers: the lower pulverized coal burner and the upper pulverized coal burner; the residual carbon burner 51 is arranged on one laye...

no. 3 example

[0096] image 3 It is a schematic diagram of the arrangement structure of the low NOx combustion system of the third embodiment of the present invention.

[0097] Such as image 3 As shown, the low NOx combustion system of the third embodiment includes a furnace body, a plasma reactor 21 , a reburning burner 41 , a pulverized coal burner 61 , a pre-overfired air nozzle 72 and an overfired air nozzle 71 . Wherein, the space inside the furnace body forms a furnace 91 . The reburning burner 41, the pulverized coal burner 61, the pre-burned-off air spout 72 and the over-burned air spout 71 are all installed on the body of heater and lead into the furnace 91. The furnace chamber 91 has a furnace center axis 81 and the plasma reactor 21 has a reactor center axis 11 .

[0098] In the third embodiment, the pulverized coal burner 61 is divided into three layers: the lower layer of pulverized coal burner, the middle layer and the upper layer of pulverized coal burner; the reburning b...

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Abstract

The invention discloses a low NOx burning method and a low NOx burning system. The low NOx burning method includes the steps: a main fuel is inputted into a main burning zone of a hearth (91), and the excess air coefficient of the main burning zone is less than 1; a reburning fuel is inputted into a reburning zone, located at the downstream of the main burning zone, of the hearth (91), and the excess air coefficient of the reburning zone is less than 1; and burnout air is inputted into a burnout zone, located at the downstream of the reburning zone, of the hearth (91), and the excess air coefficient of the burnout zone is greater than 1. Based on air staging burning in the main burning zone and the burnout zone, the reburning technology is reasonably combined, the purpose of low emission of NOx at an outlet of the hearth can be reliably achieved, so as to achieve higher NOx emission reduction rate.

Description

technical field [0001] The invention relates to the field of thermodynamic machinery, in particular to a low NOx combustion method and a low NOx combustion system. Background technique [0002] The main components of coal are C, H, O, N, S, etc. The pollution of coal to the environment is mainly the pollution of the pollutants produced by its combustion to the environment. Coal combustion will produce a large amount of pollutants such as dust, SOx (sulfur oxides, including SO 2 , SO 3 , S 2 o 3 , SO, S 2 o 7 and SO 4 ), NOx (nitrogen oxides, including NO, NO 2 and N 2 O) and CO 2 Wait. In NOx, N 2 O causes the greenhouse effect, NO and NO 2 It is considered to be an important cause of ground-level ozone, photochemical smog and acid rain. Therefore, NOx is considered to be one of the main sources of air pollutants. [0003] Worldwide, NOx emissions from burning fossil fuels account for a large proportion of all NOx emissions. For example, NOx produced by coal co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C5/08F23C7/00F23C9/00F23C1/12C10J3/48
Inventor 李明孙树翁龚泽儒宋林波甄晓伟李强邹鹏张超群董永胜
Owner YANTAI LONGYUAN POWER TECH
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