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Two-step desulphurization method for coal-fired boiler

A technology of a coal-fired boiler and a two-step method, which is applied in the field of coal combustion 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
GUANGXI KUONENGBA ENERGY TECH DEV CO LTD
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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 a coal-fired boiler, 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 calcium hydroxide, 7 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 part...

Embodiment 2

[0031] A two-step desulfurization method for a coal-fired boiler, 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 calcium hydroxide, 5 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 ...

Embodiment 3

[0039] A two-step desulfurization method for a coal-fired boiler, 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 calcium hydroxide, 8 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 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: 12 parts of aluminum sulfate, 12 parts of sodium carbonate, 11 parts of potassium acetate, 9 parts...

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PUM

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Abstract

The invention discloses a two-step desulphurization method for a coal-fired boiler. 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 burning, wherein the desulfurizer A is prepared through mixing coal slag, calcium oxide, calcium hydroxide, 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 burning 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 two-step desulfurization method for coal-fired boilers. 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....

Claims

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Application Information

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IPC IPC(8): B01D53/83B01D53/50C10L9/10
CPCB01D53/83B01D53/508B01D2251/302B01D2251/402B01D2251/404B01D2251/602B01D2251/604B01D2251/606B01D2251/608B01D2251/80B01D2257/302B01D2258/02B01D2259/128C10L9/10
Inventor 江东黄天梁君祚梁承悍
Owner GUANGXI KUONENGBA ENERGY TECH DEV CO LTD
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