Method for improving combustion performance of coal dust through using sludge or wastes

A pulverized coal combustion and waste technology, which is applied in the fuel, solid fuel, petroleum industry and other directions, can solve the problems of large pollution, difficult drying, and not found, and achieves a simple and practical method. The effect of performance improvement

Active Publication Date: 2013-10-23
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, sludge from municipal sewage treatment plants (most of which have a dry basis organic matter content of up to 80%) is currently used for landfill, composting, and ceramsite production. equipment, using waste heat from thermal power plants or cement plants to dry dewatered sludge first, and then process it. For example, Chinese patent application No. 201110003094.4 discloses a system for drying waste gas from cement production and treating sludge, which uses waste heat to dry first Dry reprocessing, because the sludge has a flocculated water-retaining structure, it is extremely difficult to dry and the drying efficiency is very low; the second is to directly add the sludge to the cement kiln grate cooler, kiln tail smoke chamber, calciner, In the pre-combustion furnace and the kiln connecting pipe, it is actually difficult to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]The coal mill of a 2500t / d dry-process cement plant is a vertical mill, which originally used bituminous coal. The output of the coal vertical mill is 45t / h, and the fineness of coal powder is controlled at 80μm to sieve 2-3%. The local coal source is anthracite with an average volatile content of 6.9% and an average calorific value of 5600Kcal / Kg. In order to reduce the purchase cost of coal, after purchasing a "burner dedicated to burning anthracite", the bituminous coal purchased from other places is changed to use local anthracite. When the vertical coal mill grinds anthracite, it vibrates greatly and often stops. As a last resort, the coal material was sprayed with water on the coal feeding vertical mill belt. The output of the coal mill dropped to 40t / h, and the fineness of the coal powder was 80μm. It is a safe situation when the sieve residue with a fineness of 80 μm falls below 2%, and the amplitude of the coal vertical mill drops below 0.8mm. The average calor...

Embodiment 2

[0032] The coal mill of a 1500t / d dry-process cement plant is an air-swept mill, which uses anthracite and bituminous coal at a ratio of 2:1, and uses a forklift to measure and match the coal piles in the coal pile shed and shovels the coal pile evenly. The output of the wind-swept mill is 16t / h. Coal powder fineness 80μm sieves 1~3%, the average volatile content of coal powder entering the kiln is 14.5%, and the average calorific value is 5100Kcal / Kg. The flame temperature in the kiln is relatively low, the flying sand is large, the smoke chamber at the kiln tail is severely crusted, the crust is long in the rear of the kiln, the kiln tail is often dumped, and there are many raw materials for the clinker core. The converted heat consumption of clinker is 830Kcal / kg.

[0033] The test used the aged sludge stored in the open air of the municipal sewage treatment plant. The average moisture content of the sampled sludge was 43.7%, the organic matter content of the dry sludge was...

Embodiment 3

[0035] A 60,000-kilowatt thermal power plant uses a steel ball roller coal mill and uses coal blending. The output of a single coal mill is 48t / h, and the coal fineness is R 90 The remainder of the sieve is 12%. The average volatile content of pulverized coal entering the boiler is 7.9%, and the average calorific value is 4450Kcal / Kg. Due to the poor quality of coal, the furnace is easy to extinguish, and diesel oil needs to be injected frequently to support combustion. The loss on ignition of the original furnace slag is 6-15% (loss on ignition ≈ coke content), the loss on ignition of fly ash is 9-17%, and the coal consumption per kWh is about 0.47kg.

[0036] The test uses the municipal sewage treatment plant to digest the sludge. The average moisture content of the sampled sludge is 83.6%, the organic content of the dry sludge is 72%, and the calorific value of the dry sludge is 3307Kcal / Kg. Use a tank truck to transport the water-containing sludge into the thermal power p...

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PUM

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Abstract

A method for improving the combustion performance of coal dust through using sludge or wastes comprises the following steps: burdening sludge or wastes containing organic matters into particulate or granular fire coal in a space section from a raw coal pile to the feeding port of a coal mill, and grinding the sludge or wastes and the particulate or granular fire coal to prepare coal dust of the sludge or wastes containing organic matters, wherein the burdening amount of the sludge or wastes containing organic matters is 1-30% of the weight of the particulate or granular fire coal. The method uses the sludge and the wastes as a productive resource for improving the combustion performance of the coal dust, so it is convenient for the coal mills of a large quantity of cement plants and hydraulic power plants to improve the performance of the anthracite inferior coal dust through utilizing local sludge and wastes, and also realizes the full utilization of the huge renewable energy sources comprising the sludge and the wastes; and the method has the advantages of no secondary pollution, and no extract waste utilization or environmental protection cost.

Description

technical field [0001] The invention relates to a method for improving the combustion performance of pulverized coal, in particular to a method for improving the combustion performance of pulverized coal fed into a kiln by using sludge or waste containing organic matter. Background technique [0002] Coal is a fossil fuel produced by biochemical reactions and physical and chemical reactions in high-temperature and high-pressure geological environments after the death of plants. That is, coal is a complex organic polymer. The content of combustible components C, H, O, and N elements varies greatly. Generally, when the content of H, O, and N in coal is high, the volatile content of coal is high, its flammability is good, the ignition temperature is low, and the burnout time is short, that is, the combustion performance is good; the higher the content of H, O, and N in coal Low, the lower the volatile content of coal, the worse its flammability, the higher the ignition tempera...

Claims

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Application Information

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IPC IPC(8): C10L9/10
Inventor 尹小林尹无忌
Owner 长沙紫宸科技开发有限公司
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