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A kind of coal mixture with desulfurization effect and its preparation method and application

A mixture and raw coal technology, applied in the field of clean coal, can solve the problems of large investment in equipment and operation, low utilization rate of desulfurization agent, etc., and achieve the effect of improving utilization rate, improving self-desulfurization efficiency, and strong adhesion

Active Publication Date: 2017-02-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low desulfurization agent utilization rate and large investment in equipment and operation in the desulfurization link of the existing coal utilization process, and propose a coal mixture with desulfurization effect and its preparation method and application

Method used

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  • A kind of coal mixture with desulfurization effect and its preparation method and application
  • A kind of coal mixture with desulfurization effect and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Add 25kg of block lime with a CaO content of 87.4% and an average particle size of 20mm into 150kg of water to prepare a lime slurry, keep it standing for 15 minutes, and measure the Ca(OH) in the slurry 2 The average particle diameter of the particles was 7 μm. Add 50 kg of raw coal with an average particle size of 0.5 mm into the lime slurry and stir evenly to obtain a mixture of coal and lime slurry. The mixture is dehydrated to a material with a water content of about 30% by vacuum filtration, and sent to an infrared heating and drying device for further drying to prepare a coal mixture with a water content of 5% and a desulfurization effect. By determination, the Ca(OH) in the mixture 2 The content is 30%, the raw coal content is 60%, and the impurity content is 5%.

[0034] Use the nitrogen adsorption instrument to measure the specific surface area and the pore distribution results of the limestone commonly used in the industry and the coal mixture with desulfur...

Embodiment 2

[0039] The coal mixture with desulfurization effect under several typical conditions is prepared according to the method of the invention. Table 2 lists the desulfurization efficiency of the coal mixture with desulfurization effect obtained under some typical preparation conditions. The experimental process of measuring the desulfurization efficiency is carried out on a circulating fluidized bed test bench with a bed temperature of 900°C, a coal sulfur content of 0.8%, a calcium-sulfur molar ratio of 1.5, and a thermal power of 160kw. As the basis and basis for comparing the desulfurization efficiency of the prepared coal mixture with desulfurization effect, the desulfurization efficiency of industrial limestone was measured to be 65% through the above experimental process.

[0040] Table 2 Desulfurization efficiency of coal mixtures with desulfurization effect obtained under typical preparation conditions

[0041]

[0042] According to the results in Table 2, it can be se...

Embodiment 3

[0044]Lime slurry was prepared by mixing block lime with a CaO content of 90% and an average particle size of 30 mm and water at a mass ratio of 1:5, and allowed to stand for 20 minutes. Add coal with an average particle size of 0.5 mm into the lime slurry, the mass ratio of coal to lump lime is 2:1, and mix evenly by stirring to obtain a mixture of coal and lime slurry. By using the method of mixing with raw coal to achieve the purpose of reducing the moisture content of the mixture of coal and lime slurry, a coal mixture with desulfurization effect is prepared, and the moisture content in the mixture is 10%, Ca(OH) 2 The coal content is 2.5%, and the raw coal content is 87.3%. The coal mixture is fed into the furnace together with the remaining coal through the coal feeding belt of the circulating fluidized bed boiler. The main operating parameters of the circulating fluidized bed boiler are: power 150MW, coal sulfur content 0.7%, calcium sulfur molar ratio 1.5. The average...

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Abstract

The invention discloses a coal mixture with a desulfurization effect and a preparation method and application of the coal mixture, relating to the technical field of coal cleaning. The coal mixture with the desulfurization effect is characterized by being prepared by mixing massive lime raw materials, coal particles and water according to a certain ratio, grinding massive lime into ultrafine calcium hydroxide particles which are attached to the surfaces and inner pores of the coal particles and reducing the water content, and the coal mixture can be directly used as a coal processing and utilization raw material. By the method, the self-desulfurization of coal and the utilization rate of a desulfurizing agent can be obviously improved; furthermore, the process of adding the desulfurizing agent into a coal utilization device is simplified, and the investment and the use cost of desulfurizing equipment are lowered.

Description

technical field [0001] The invention relates to a technology for reducing sulfur oxide emissions in the process of coal utilization, in particular to a coal mixture with desulfurization effect and its preparation method and application, belonging to the technical field of clean coal. Background technique [0002] Pollutants produced by coal utilization are the biggest source of pollution causing damage to the ecological environment, and have become a top priority for global air pollution control. Aiming at the removal of sulfur oxides produced in the process of coal utilization, at present, the method of flue gas treatment after coal utilization is mainly used, such as wet, semi-dry or dry desulfurization technology, which has the advantage of high desulfurization efficiency, However, there are a series of problems such as high investment and operating costs and large floor space. Generally speaking, the alkali metal elements contained in coal have a certain desulfurization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/50
Inventor 由长福赵硕
Owner TSINGHUA UNIV
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