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Real-time desulfurization method for coal combustion

A coal combustion and desulfurization agent technology, applied in the field of coal combustion desulfurization, can solve the problem that the sulfur fixation efficiency is lower than 50%, and achieve the effects of inhibiting pyrolysis, promoting combustion, and ensuring combustion

Inactive Publication Date: 2016-03-16
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 real-time desulfurization method for coal combustion, 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 and 6 parts of magnesium 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, 4 parts of v...

Embodiment 2

[0031] A real-time desulfurization method for coal combustion, 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 and 4 parts of magnesium 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 Preparation: 10 parts of aluminum sulfate, 10 parts of sodium carbonate, 9 parts of potassium acetate, 15 parts of iron carbonate, 5 parts...

Embodiment 3

[0039] A real-time desulfurization method for coal combustion, 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 and 8 parts of magnesium 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, 3 parts of vanadium pentoxide ...

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PUM

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Abstract

The invention discloses a real-time desulfurization method for coal combustion. The method comprises the following steps: S1, mixing coal powder with a desulfurizing agent A to prepare desulfurized coal A, and spraying the desulfurized coal A into a boiler to burn, wherein the desulfurizing agent A is prepared by mixing coal cinder, calcium oxide, limestone and magnesium oxide in a ratio; S2, mixing the coal powder and a desulfurizing agent B to prepare desulfurized coal B, and then spraying the desulfurized coal B into the main burning area of the boiler by virtue of a spray pipe which is crosswise arranged with a secondary air pipe, wherein the desulfurizing agent B is prepared by mixing aluminum sulfate, sodium carbonate, potassium acetate, iron carbonate, vanadium pentoxide and zinc borate in a ratio; adding the desulfurizing agent B into water to prepare 10-20 percent by mass of suspension by mixing, mixing with coal powder, and standing until the moisture content is 3-5 percent to obtain the desulfurized coal B. According to the method, the desulfurizing agent is stepwise added, so that the effect of a calcium-based desulfurizing agent is sufficiently achieved, and the desulfurization efficiency is greatly improved.

Description

technical field [0001] The invention relates to coal combustion desulfurization, in particular to a coal combustion real-time 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 o...

Claims

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Application Information

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IPC IPC(8): C10L9/10
CPCC10L9/10
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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