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Low-emission system of coal-fired boiler and treatment method of low-emission system

A technology for coal-fired boilers and boilers, which is used in the combustion of solid fuels, combustion equipment, lighting and heating equipment, etc., can solve the problems of high operating costs, low boiler thermal efficiency, and high pollutant emissions, and achieves lower furnace temperatures. Reaction conditions, high activity effect

Inactive Publication Date: 2019-03-29
YANKUANG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problems of low thermal efficiency of boilers existing in existing layer-fired boilers, high operating costs for desulfurization, denitrification and dust removal transformation or new additions, and high pollutant emissions, the invention provides a low-emission system for coal-fired boilers and a treatment method thereof

Method used

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  • Low-emission system of coal-fired boiler and treatment method of low-emission system
  • Low-emission system of coal-fired boiler and treatment method of low-emission system

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Embodiment 1

[0117] This embodiment provides a low-emission system of a coal-fired boiler and its treatment method, such as figure 1 As shown, the system includes a feeding unit, a layer-fired boiler 1, an additive adding unit 4, a flue gas dedusting unit 5, a tail gas desulfurization and denitrification unit 6, a second gas delivery device 7 induced draft fan and a chimney 8; the material outlet of the feeding unit is connected to the The coal-fired inlet of the layer-fired boiler 1 is connected, the material outlet of the additive addition unit 4 is connected with the furnace of the layer-fired boiler 1; the flue gas outlet of the layer-fired boiler 1 is connected with the flue gas dust removal unit 5 and the tail gas desulfurization and denitrification unit 6 in sequence, and the tail gas The flue gas discharged from the desulfurization and denitrification unit is sent to the chimney 8 through the second gas delivery device 7;

[0118] Wherein, the floor-fired boiler 1 is a chain grate ...

Embodiment 2

[0131] This embodiment provides a low-emission system of a coal-fired boiler and its treatment method. The structure of the system refers to the structure in Embodiment 1, the difference is that: Figure 5 As shown, the static desulfurization and denitration device includes a pipeline and a desulfurization module 63 and a denitration module 64 arranged inside the pipeline in sequence. The flue gas dust removal unit 5 is placed in front of the desulfurization module 63 in the pipeline, and the desulfurization module 63 is a desulfurization module. denitration agent box, the box body of the desulfurization agent box is a net cage, and the desulfurization adsorbent is built in the net cage; The porosity of the denitrification adsorbent is 0.5% to 0.53%.

[0132] The treatment method of the low-emission system refers to Example 1, the difference is that the volatile content in the briquette in step (a) is 30wt% to 33wt%, the additive content is 14wt% to 15wt%, and the ash content ...

Embodiment 3

[0135] This embodiment provides a low-emission system of a coal-fired boiler and its treatment method. The structure of the system refers to the structure in Example 1, the difference is that the porosity of the desulfurization adsorbent is 0.58% to 0.6%, and the denitrification adsorbent The porosity is 0.58% to 0.6%.

[0136] The treatment method of the low-emission system refers to Example 1, the difference is that the volatile content in the briquette in step (a) is 33wt% to 35wt%, the additive content is 10wt% to 12wt%, and the ash content <25wt%. 1. During the operation, the coal-fired accumulation thickness on the grate is 12cm-13cm. The speed of the fire grate during the operation of the layer-fired boiler 1 is 7m / h-8m / h, and the volume content of the flue gas discharged from the furnace body is 18 % to 20% of the flue gas is returned to the air chamber of the layer-fired boiler 1; the average particle size of the composite addition in step (b) is 0.38mm.

[0137] In ...

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Abstract

The invention provides a low-emission system of a coal-fired boiler and a treatment method of the low-emission system. The system comprises a charging unit, a layer-burning boiler, an additive addingunit, a flue gas dust removal unit and a tail gas desulfurization and denitrification unit. A material outlet of the charging unit is connected with a fire coal inlet of the layer-burning boiler, anda material outlet of the additive adding unit is connected with a hearth of the layer-burning boiler. A flue gas outlet of the layer-burning boiler is sequentially connected with the flue gas dust removal unit and the tail gas desulfurization and denitrification unit. Briquette coal suitable for the layer-burning boiler is adopted, the burning conditions of fire coal in the layer-burning boiler are improved, an additive is sprayed, the adding manner of the additive is optimized, in combination with the tail gas treatment process, the heat loss caused by flue gas exhaust is finally reduced, theheat loss caused by the fact that solids are not completely burnt is reduced, the leakage amount of fine coal is reduced, the heat efficiency of the boiler is improved, emission of pollutants is reduced, and ultra-low emission of the industrial boiler is achieved.

Description

technical field [0001] The invention belongs to the field of coal combustion equipment, and relates to a low-emission system of a coal-fired boiler and a treatment method thereof, in particular to a low-emission system suitable for medium and small coal-fired boilers and a treatment method thereof. Background technique [0002] Chain furnace is a layer fired boiler, which is widely used in coal-fired industrial boilers in my country. In terms of combustion organization, the chain furnace is dominated by constant-speed moving grate layer combustion, supplemented by suspended combustion formed by fine particles in the upper area of ​​the grate. The air distribution is dominated by the primary air sent from the bottom of the grate, and the secondary air from the upper part of the grate is supplemented. From the point of view of combustion concept, chain furnace can theoretically avoid NO x generated in large quantities. [0003] CN 107166428A and CN 106439792A disclose layer...

Claims

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Application Information

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IPC IPC(8): F23B30/08F23J15/00F23J15/02
CPCF23B30/08F23J15/006F23J15/02
Inventor 刘忠攀杨晓辉谭波赵连涛张海燕白文凯
Owner YANKUANG GRP CO LTD
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