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Rotary kiln combustion system utilizing low heating value coal gas

A low-calorific value gas and combustion system technology, which is applied in the directions of preheating, rotary drum furnace, waste heat treatment, etc., can solve the problems of increasing the amount of cold air, difficult and incomparable heat balance of the kiln tail charge preheater.

Inactive Publication Date: 2013-05-15
HUNAN PROV METALLURGICAL PLANNING & DESIGNING INST
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the "Lime Rotary Kiln Low Calorific Value Coal Gas Oxygen-Enriched Combustion Process" proposed by China Metallurgical Coking Nai Engineering Technology Co., Ltd. proposes that it is technically feasible to use low calorific value gas as the fuel of lime rotary kiln, it is indeed a way to reduce combustion flue gas Volume is an effective method, but there are the following problems: 1. When the oxygen enrichment degree is below 25%, it should not exceed 2000×4.18kJ / Nm 3 For coal gas with calorific value, the exhaust gas temperature of rotary kiln will be much higher than that of high calorific value fuel rotary kiln. It is difficult to ensure the thermal balance of the furnace charge preheater at the end of the kiln, and the temperature of flue gas entering the dust collector will be too high
In conventional production, the amount of cold air mixed in is increased, which in turn will lead to an excessive load on the equipment of the dust removal and smoke exhaust system
2. The production cost of industrial oxygen is high, and it is far inferior to free air economically.
3. Industrial oxygen is a high energy consumption product, and the energy consumption of working fluid is as high as 0.4kgce / m 3 , which has a negative impact on the reduction of energy consumption in the product process
4. Pair (2000~2500)×4.18kJ / Nm 3 Coal gas in the calorific value range has no surplus of industrial oxygen, while the oxygen-enriched combustion of rotary kiln process gas has considerable limitations
A small number of fuels with low calorific value are used, but a large amount of fuel with high calorific value is still blended, and some even do not hesitate to add raw coal, petroleum coke or coke powder with high calorific value to the furnace charge beyond the amount of reducing agent.
[0007] Today's energy crisis has caused the fuel application of the following rotary kiln processes: expensive fuel oil is used in the rotary kiln combustion system, which is basically banned in China; the price of high-quality coal with high calorific value is rising rapidly, and the supply is unstable; the price of gas with high calorific value Fast Rising and Limited Supply

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1 - a rotary kiln combustion system using low calorific value gas in parallel preheating charge and gas

[0023] as attached figure 2 As shown, it is a rotary kiln combustion system using low calorific value gas in parallel preheating charge and gas. It consists of a metal heat exchanger (1) for preheating gas, a burner (3), a rotary kiln (4), a fume hood (5), a charge preheater (6), a dust collector (7), and an induced draft fan (8), chimney (9), product cooler (10), secondary fan (11), primary fan (12) and other equipment configurations, the high-temperature flue gas from the rotary kiln is divided into 2 ways to preheat the charge and The combustion medium gas, the first path enters the charge preheater (6) for preheating the charge, and the second path enters the metal heat exchanger (1) for preheating the gas. After the flue gas of the two paths is combined and aggregated, it enters the dust collector (7 ). The flue gas after dedusting or desulfurizatio...

Embodiment 2

[0024] Example 2 - a rotary kiln combustion system using low calorific value gas in parallel preheating charge and primary air

[0025] as attached image 3 As shown, it is a rotary kiln combustion system using low calorific value gas in parallel preheating charge and primary air. It consists of a metal heat exchanger (2) for preheating primary air, a burner (3), a rotary kiln (4), a fume hood (5), a charge preheater (6), a dust collector (7), and a Fan (8), chimney (9), product cooler (10), secondary fan (11), primary fan (12) and other equipment are configured, and the high-temperature flue gas from the rotary kiln is divided into 2 channels to preheat the furnace charge respectively and the primary air of the combustion medium, the first path enters the charge preheater (6) for preheating the charge, the second path enters the metal heat exchanger (2) for preheating the primary air, and finally enters the dust collector (7) collectively. The flue gas after dedusting or de...

Embodiment 3

[0026] Example 3 - a rotary kiln combustion system using low calorific value gas in parallel preheating charge, coal gas and primary air

[0027] as attached Figure 4As shown, it is a rotary kiln combustion system using low calorific value gas in parallel for preheating charge, gas and primary air. It consists of a metal heat exchanger (1) for preheating the gas and a metal heat exchanger (2) for preheating the primary air at the same time, together with the burner (3), the rotary kiln (4), the hood (5), and the charge Preheater (6), dust collector (7), induced draft fan (8), chimney (9), product cooler (10), secondary fan (11), primary fan (12) and other equipment are configured, and the rotary The high-temperature flue gas from the kiln is divided into three paths to preheat the charge and the combustion medium respectively. The first path enters the charge preheater (6) for preheating the charge, and the second path enters the metal heat exchanger (1) for preheating the g...

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Abstract

The invention relates to a rotary kiln combustion system utilizing low heating value coal gas and belongs to the technical field of industrial furnace smoke waste-heat utilization. The rotary kiln combustion system utilizing the low heating value gas is characterized by comprising a metal heat exchanger (1) which is used for preheating coal gas, or the metal heat exchanger (1) and a metal heat exchanger (2), wherein the metal heat exchanger (1) is used for preheating the gas and the metal heat exchanger (2) which is used for preheating the primary air, a burning mouth (3), a rotary kiln (4), a material-sliding gas hood (5), a furnace burden preheater (6), a dust remover (7), a primary air fan (12) and the like. The high-temperature gas from a rotary kiln is divided into two paths or three paths to respectively preheat furnace burden and burning medium. The rotary kiln combustion system utilizing the low heating value coal gas has the advantages of replacing high heating value fuel by cheap coal gas and reducing cost and energy consumption of products. The rotary kiln combustion system utilizing the low heating value coal gas is wide in application prospect for energy conservation technology transformation of rotary process and rotary kiln processes of roasting, calcining, solid reduction, mineral aggregate and the like.

Description

1. Technical field [0001] A rotary kiln combustion system using low calorific value gas, which relates to the technical field of waste heat utilization of industrial furnace flue gas, and is mainly used in the industries of building materials, chemical industry, ferrous metallurgy and non-ferrous metal smelting, and rotary kiln roasting, calcination and solidification of bulk granular materials. Processes such as reduction smelting and mineral material pretreatment, as well as energy-saving technological transformation of rotary kiln processes. 2. Background technology [0002] From the perspective of China's patented technology, similar fields of invention and utility model patent retrieval, the background technology is as follows. [0003] Li Junfeng applied in November 1996 and published in May 1998. Invented by Li Junfeng, a combustion system for cement rotary kiln is a facility that uses cement clinker cooler to preheat combustion-supporting air; Shenyang Aluminum and M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B7/34F27D13/00F27D17/00
CPCY02P10/265Y02P10/25
Inventor 何红兵聂春分
Owner HUNAN PROV METALLURGICAL PLANNING & DESIGNING INST