Coal combustion desulphurization method

A technology for coal combustion and desulfurization agent, which is applied in the field of coal combustion and desulfurization, can solve the problems such as the sulfur fixation efficiency being lower than 50%, and achieve the effect of improving the desulfurization efficiency.

Inactive Publication Date: 2016-02-24
广西桂晟新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in reality, calcium-based desulfurizers use calcium sulfate as the main sulfur-containing ore phase, which will decompose below 1100°C under the combustion condition of pulverized coal, so that the sulfur fixation efficiency is still mostly lower than 50%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A coal combustion desulfurization method, comprising the following steps:

[0024] S1. Mix pulverized coal and desulfurizer A evenly, grind them, and pass through a 100-150 mesh sieve to obtain desulfurized coal A. Spray desulfurized coal A into the boiler for combustion; wherein, desulfurizer A is made of the following raw materials Proportion by weight: 25 parts of cinder, 25 parts of calcium oxide, 46 parts of limestone, 5 parts of aluminum oxide and 2 parts of zinc oxide, the weight ratio of coal powder and desulfurizer A is 50:1;

[0025] S2. Mix the pulverized coal and desulfurizer B evenly to obtain desulfurized coal B, and then spray it into the main combustion zone of the boiler through the spray pipe intersecting with the secondary air pipe; wherein: the desulfurizer B is prepared from the following raw materials in parts by weight Ratio: 11 parts of aluminum sulfate, 11 parts of sodium carbonate, 10 parts of potassium acetate, 12 parts of iron carbonate, 7 pa...

Embodiment 2

[0031] A coal combustion desulfurization method, comprising the following steps:

[0032] S1. Mix pulverized coal and desulfurizer A evenly, grind them, and pass through a 100-150 mesh sieve to obtain desulfurized coal A. Spray desulfurized coal A into the boiler for combustion; wherein, desulfurizer A is made of the following raw materials Proportion by weight: 20 parts of cinder, 30 parts of calcium oxide, 52 parts of limestone, 4 parts of aluminum oxide and 1 part of zinc oxide, the weight ratio of coal powder and desulfurizer A is 53:1;

[0033] S2. Mix the pulverized coal and desulfurizer B evenly to obtain desulfurized coal B, and then spray it into the main combustion zone of the boiler through the spray pipe intersecting with the secondary air pipe; wherein: the desulfurizer B is prepared from the following raw materials in parts by weight Ratio: 10 parts of aluminum sulfate, 10 parts of sodium carbonate, 9 parts of potassium acetate, 15 parts of iron carbonate, 9 part...

Embodiment 3

[0039] A coal combustion desulfurization method, comprising the following steps:

[0040] S1. Mix pulverized coal and desulfurizer A evenly, grind them, and pass through a 100-150 mesh sieve to obtain desulfurized coal A. Spray desulfurized coal A into the boiler for combustion; wherein, desulfurizer A is made of the following raw materials Proportion by weight: 30 parts of cinder, 20 parts of calcium oxide, 40 parts of limestone, 6 parts of aluminum oxide and 3 parts of zinc oxide, the weight ratio of coal powder and desulfurizer A is 55:1;

[0041] S2. Mix pulverized coal and desulfurizer B evenly to obtain desulfurized coal B, and then spray it into the main combustion zone of the boiler through the spray pipe intersecting with the secondary air pipe; wherein: desulfurizer B is prepared by weight from the following raw materials Ratio: 12 parts of aluminum sulfate, 12 parts of sodium carbonate, 11 parts of potassium acetate, 9 parts of iron carbonate, 5 parts of ammonium mo...

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PUM

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Abstract

The invention discloses a coal combustion desulphurization method. The method comprises the following steps: 1, mixing coal dust with a desulfurizer A to obtain desulfurized coal A, injecting the desulfurized coal A to a boiler, and combusting, wherein the desulfurizer A is prepared through mixing coal slag, calcium oxide, limestone, alumina and zinc oxide in proportion; and 2, mixing the coal dust with a desulfurizer B to prepare desulfurized coal B, and injecting the desulfurized B to the main combustion zone of the boiler through a spray tube intersecting with a secondary wind tube, wherein the desulfurizer B is prepared through mixing aluminum sulfate, sodium carbonate, potassium acetate, iron carbonate, ammonium molybdate and magnesium chloride in proportion, the desulfurizer B is added to water and is mixed to prepare a suspension with the mass percentage of 12-20%, the suspension is mixed with the coal dust, and the obtained material is disposed until the water content is 3-5% to obtain the desulfurized coal B. The desulfurizers are added in a segmented manner, so the effects of a calcium base desulfurizer are fully shown, and the desulphurization efficiency is greatly improved.

Description

technical field [0001] The invention relates to coal combustion desulfurization, in particular to a coal combustion desulfurization method. Background technique [0002] Sulfur in coal includes inorganic sulfur, organic sulfur and elemental sulfur. Inorganic sulfur mainly exists in the form of disulfide and sulfate, most of the disulfide is pyrite, a small part is marcasite, and the sulfate is mainly calcium sulfate CaSO 4 ; The organic sulfur is directly bonded to the coal matrix in the form of mercaptan, sulfide, disulfide and aromatic ring sulfur represented by thiophene series. The use of calcium-based desulfurizers for desulfurization during coal combustion is currently the most widely used desulfurization method. Due to the complexity of the sulfur fixation reaction process and the re-decomposition of sulfate at high temperatures, the effective utilization rate and sulfur fixation efficiency of combustion calcium-based desulfurizers are generally low. In order to im...

Claims

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Application Information

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IPC IPC(8): C10L9/10
Inventor 江东黄天梁君祚梁承悍
Owner 广西桂晟新能源科技有限公司
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