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Two-step desulphurization method of coal combustion process

A technology for coal combustion and desulfurization agent, which is applied in the field of coal combustion and desulfurization, can solve problems such as the sulfur fixation efficiency being lower than 50%, and achieve the effects of inhibiting high temperature decomposition, improving desulfurization efficiency, and promoting combustion

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 two-step desulfurization method for coal combustion process, including the following steps:

[0024] S1. Mix pulverized coal and desulfurizer A evenly, grind, and then pass through a 100-150 mesh sieve to obtain desulfurized coal A after sieving. Desulfurized coal A is sprayed into the boiler for combustion; among them, desulfurizer A is made of the following raw materials It is prepared in parts by weight: 25 parts of coal slag, 25 parts of calcium oxide, 46 parts of limestone and 7 parts of alumina, and the weight ratio of pulverized coal to desulfurizer A is 50:1;

[0025] S2. Mix pulverized coal and desulfurizer B evenly to obtain desulfurized coal B, which is then sprayed into the main combustion zone of the boiler through a spray pipe arranged across the secondary air pipe; wherein: the desulfurizer B is made up of the following raw materials in parts by weight The ratio is made: 11 parts of aluminum sulfate, 11 parts of sodium carbonate, 9 parts of potassium chlorid...

Embodiment 2

[0031] A two-step desulfurization method for coal combustion process, including the following steps:

[0032] S1. Mix pulverized coal and desulfurizer A evenly, grind, and then pass through a 100-150 mesh sieve to obtain desulfurized coal A after sieving. Desulfurized coal A is sprayed into the boiler for combustion; among them, desulfurizer A is made of the following raw materials It is prepared in parts by weight: 20 parts of coal slag, 30 parts of calcium oxide, 52 parts of limestone and 5 parts of alumina, and the weight ratio of pulverized coal to desulfurizer A is 53:1;

[0033] S2. Mix pulverized coal and desulfurizer B evenly to obtain desulfurized coal B, which is then sprayed into the main combustion zone of the boiler through a spray pipe arranged across the secondary air pipe; wherein: the desulfurizer B is made up of the following raw materials in parts by weight The ratio is made: 10 parts of aluminum sulfate, 10 parts of sodium carbonate, 8 parts of potassium chlorid...

Embodiment 3

[0039] A two-step desulfurization method for coal combustion process, including the following steps:

[0040] S1. Mix pulverized coal and desulfurizer A evenly, grind, and then pass through a 100-150 mesh sieve to obtain desulfurized coal A after sieving. Desulfurized coal A is sprayed into the boiler for combustion; among them, desulfurizer A is made of the following raw materials It is prepared in parts by weight: 30 parts of coal slag, 20 parts of calcium oxide, 40 parts of limestone and 8 parts of alumina, and the weight ratio of pulverized coal to desulfurizer A is 55:1;

[0041] S2. Mix pulverized coal and desulfurizer B evenly to obtain desulfurized coal B, which is then sprayed into the main combustion zone of the boiler through a spray pipe arranged across the secondary air pipe; wherein: the desulfurizer B is made up of the following raw materials in parts by weight The ratio is made: 12 parts of aluminum sulfate, 12 parts of sodium carbonate, 10 parts of potassium chlori...

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PUM

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Abstract

The invention discloses a two-step desulphurization method of a coal combustion process. 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 and alumina 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 chloride, iron carbonate, vanadic anhydride and zinc borate 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 two-step desulfurization method in a coal combustion process. Background technique [0002] The sulfur in coal includes inorganic sulfur, organic sulfur and elemental sulfur. Inorganic sulfur is mainly 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 ; Organic sulfur is directly bonded to the coal matrix in the form of mercaptan, sulfide, disulfide and aromatic ring sulfur represented by thiophene. 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 burning calcium-based desulfurizers are generally low. In order to ...

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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