A combustion-stabilizing and combustion-aiding coal-saving agent, its preparation method and application

Abstract

This invention provides a coal-saving agent that stabilizes and improves combustion, its preparation method, and its application, belonging to the field of coal combustion technology. The coal-saving agent provided by this invention comprises: 5-10% oxidant, 1-8% combustion improver, 5-15% catalyst, 1-5% desulfurizer, 2-4% calcium magnesium acetate, 1-4% dispersant, and the balance being water. This invention uses potassium permanganate and sodium nitrate as oxidants, which have different decomposition temperatures and can release oxygen at different temperatures and time periods, thus promoting more complete combustion of coal. It uses manganese tetroxide, cerium dioxide, and ferric chloride as catalysts, which have a synergistic effect, further promoting coal combustion and burnout. The addition of calcium magnesium acetate as an electron transfer medium lowers the activation energy, reduces the ignition temperature, and improves the burnout rate. Controlling the composition and dosage of each component enhances the coal-saving effect of the agent.

Description

Technical Field

[0001] This invention belongs to the field of coal combustion technology, specifically relating to a combustion stabilizing and combustion-aiding coal-saving agent, its preparation method, and its application. Background Technology

[0002] Coal, as one of the primary energy sources, is widely used in various fields such as power generation, industrial heating, and chemical production. However, the use of coal also brings a series of problems, such as low combustion efficiency and high pollutant emissions during combustion. To address these issues, coal-saving agents have emerged, but the coal-saving effect of existing agents still needs further improvement. Therefore, how to improve coal-saving agents to further enhance their coal-saving effect has become a challenging problem in this field. Summary of the Invention

[0003] The purpose of this invention is to provide a combustion-stabilizing and combustion-aiding coal-saving agent, its preparation method, and its application. The coal-saving agent provided by this invention has a better coal-saving effect.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a combustion stabilizing and combustion-aiding coal-saving agent, comprising the following components by mass percentage: 5-10% oxidant, 1-8% combustion aid, 5-15% catalyst, 1-5% desulfurizer, 2-4% calcium magnesium acetate, 1-4% dispersant, and the balance being water; The oxidant includes potassium permanganate and sodium nitrate; the catalyst includes manganese tetroxide, cerium dioxide and ferric chloride.

[0005] Preferably, the mass ratio of potassium permanganate to sodium nitrate is 1:(1~3).

[0006] Preferably, the mass ratio of potassium permanganate to sodium nitrate is 1:(1~2).

[0007] Preferably, the mass ratio of manganese tetroxide, cerium dioxide and ferric chloride is (1~2):(4~6):1.

[0008] Preferably, the combustion aid includes sodium hydroxide and / or potassium hydroxide.

[0009] Preferably, the desulfurizing agent includes one or more of calcium oxide, calcium hydroxide, calcium acetate, and calcium carbonate.

[0010] Preferably, the dispersant comprises one or more of sodium hexametaphosphate, ammonium citrate, polyacrylamide, and sodium dodecylbenzenesulfonate.

[0011] Preferably, the particle size of the oxidant, combustion improver, catalyst, desulfurizer and calcium magnesium acetate is independently 20~80μm.

[0012] This invention also provides a method for preparing the combustion-stabilizing and combustion-aiding coal-saving agent described in the above technical solution, comprising: An oxidant, combustion improver, catalyst, desulfurizer, calcium magnesium acetate, dispersant, and water are mixed to obtain a combustion stabilizer, combustion improver, and coal-saving agent.

[0013] The present invention also provides the application of the combustion stabilizing and combustion-aiding coal-saving agent described in the above technical solution in coal combustion.

[0014] This invention provides a coal-saving agent that stabilizes and improves combustion, comprising the following components by mass percentage: 5-10% oxidant, 1-8% combustion improver, 5-15% catalyst, 1-5% desulfurizer, 2-4% calcium magnesium acetate, 1-4% dispersant, and the balance water. The oxidant includes potassium permanganate and sodium nitrate; the catalyst includes manganese tetroxide, cerium dioxide, and ferric chloride. This invention uses potassium permanganate and sodium nitrate as oxidants, which have different decomposition temperatures and can release oxygen at different temperatures and time periods, thus promoting more complete combustion of coal. The use of manganese tetroxide, cerium dioxide, and ferric chloride as catalysts provides synergistic effects, further enhancing coal combustion and burnout. The addition of calcium magnesium acetate as an electron transfer medium lowers the activation energy, reduces the ignition temperature, and improves the burnout rate. Controlling the composition and dosage of each component enhances the coal-saving effect of the agent. Results from the embodiments show that the coal-saving agent provided by this invention achieves a coal-saving rate of over 3% for bituminous coal. Detailed Implementation

[0015] This invention provides a combustion stabilizing and combustion-aiding coal-saving agent, which comprises the following components by mass percentage: 5-10% oxidant, 1-8% combustion aid, 5-15% catalyst, 1-5% desulfurizer, 2-4% calcium magnesium acetate, 1-4% dispersant, and the balance being water.

[0016] Unless otherwise specified, the present invention does not have any special limitations on the source of each component, and commercially available products well known to those skilled in the art can be used.

[0017] The combustion-stabilizing and coal-saving agent provided by this invention comprises 5-10% oxidant by weight percentage. As one embodiment, the amount of oxidant may specifically be 5%, 6%, 7%, 8%, 9%, or 10%.

[0018] In this invention, the oxidant includes potassium permanganate and sodium nitrate; the mass ratio of potassium permanganate to sodium nitrate is preferably 1:(1~3), more preferably 1:(1~2).

[0019] This invention uses two oxidants with different decomposition temperatures, which can release oxygen at different temperatures and time periods, thus promoting more complete combustion of coal. Controlling the mass ratio of the two oxidants can further improve the coal-saving effect of the coal-saving agent.

[0020] The combustion stabilizing and coal-saving agent provided by this invention, by weight percentage, further includes 1-8% combustion improver. As one embodiment, the amount of the combustion improver can be specifically 1%, 2%, 3%, 4%, 5%, 6%, 7%, or 8%.

[0021] In this invention, the combustion improver preferably includes sodium hydroxide and / or potassium hydroxide. By using the above-mentioned combustion improver and controlling its dosage, this invention can further improve the coal-saving effect of the coal-saving agent.

[0022] The combustion stabilizing and coal-saving agent provided by the present invention, by weight percentage, also includes 5-15% catalyst. As one embodiment, the amount of catalyst may be specifically 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%.

[0023] In this invention, the catalyst comprises manganese tetroxide, cerium dioxide, and ferric chloride; the preferred mass ratio of manganese tetroxide, cerium dioxide, and ferric chloride is (1~2):(4~6):1, more preferably 1.6:(5~6):1.

[0024] This invention uses manganese tetroxide, cerium dioxide, and ferric chloride as catalysts. The three have a synergistic effect, which can further improve the coal-saving effect of the coal-saving agent.

[0025] The combustion stabilizing and coal-saving agent provided by this invention, by weight percentage, also includes 1-5% desulfurizing agent. As one embodiment, the amount of desulfurizing agent may specifically be 1%, 2%, 3%, 4%, or 5%.

[0026] In this invention, the desulfurizing agent preferably includes one or more of calcium oxide, calcium hydroxide, calcium acetate, and calcium carbonate. By using the above-mentioned desulfurizing agent and controlling its dosage, this invention can further improve the desulfurization effect.

[0027] The combustion-stabilizing and coal-saving agent provided by this invention, by weight percentage, also includes 2-4% calcium magnesium acetate. As one embodiment, the amount of calcium magnesium acetate can be specifically 2%, 2.5%, 3%, 3.5%, or 4%. By adding calcium magnesium acetate as an electron transfer medium, this invention reduces activation energy, lowers ignition temperature, and increases burnout rate; controlling its dosage can further enhance its effectiveness.

[0028] The combustion-stabilizing and coal-saving agent provided by the present invention further includes 1-4% dispersant by weight percentage. As one embodiment, the amount of the dispersant may be specifically 1%, 2%, 3%, or 4%.

[0029] In this invention, the dispersant preferably includes one or more of sodium hexametaphosphate, ammonium citrate, polyacrylamide, and sodium dodecylbenzenesulfonate. By using the above-mentioned dispersant and controlling its dosage, this invention enables the coal-saving agent to be fully dispersed on the coal surface, further improving the effectiveness of the coal-saving agent.

[0030] The combustion stabilizing and coal-saving agent provided by this invention, by weight percentage, also includes the remainder water.

[0031] In this invention, the particle size of the oxidant, combustion improver, catalyst, desulfurizer and calcium magnesium acetate is preferably 20-80 μm.

[0032] When the particle sizes of the oxidant, combustion improver, catalyst, desulfurizer, and calcium magnesium acetate are not within the above-mentioned ranges, the present invention preferably pulverizes the oxidant, combustion improver, catalyst, desulfurizer, and calcium magnesium acetate separately. The present invention does not impose any special limitations on the pulverization operation; any technical solution well-known to those skilled in the art can be used to ensure that the particle sizes of each component are within the required range.

[0033] This invention controls the composition and dosage of the coal-saving agent to improve its coal-saving effect.

[0034] This invention also provides a method for preparing the combustion-stabilizing and combustion-aiding coal-saving agent described in the above technical solution, comprising: An oxidant, combustion improver, catalyst, desulfurizer, calcium magnesium acetate, dispersant, and water are mixed to obtain a combustion stabilizer, combustion improver, and coal-saving agent.

[0035] The present invention does not impose any special limitations on the mixing operation; any technical solution known to those skilled in the art can be used to mix or disperse the components evenly.

[0036] The present invention also provides the application of the combustion stabilizing and combustion-aiding coal-saving agent described in the above technical solution in coal combustion.

[0037] The present invention does not impose any special limitations on the operation of the application, and any technical solution known to those skilled in the art can be used.

[0038] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0039] In the examples and comparative examples, the particle sizes of the oxidant, combustion improver, catalyst, desulfurizer, and calcium magnesium acetate were independently 20–80 μm.

[0040] Example 1 A combustion-stabilizing and combustion-aiding coal-saving agent, by mass percentage, consists of the following components: 5% oxidant (potassium permanganate and sodium nitrate in a mass ratio of 1:1.5), 1% combustion aid (sodium hydroxide), 5% catalyst (manganese tetroxide, cerium dioxide and ferric chloride in a mass ratio of 1.6:6:1), 1% desulfurizer (calcium hydroxide), 2% calcium magnesium acetate, 2% dispersant (sodium hexametaphosphate), and the balance being water; The preparation method of the combustion stabilizing and combustion-aiding coal-saving agent is as follows: oxidant, combustion aid, catalyst, desulfurizer, calcium magnesium acetate, dispersant and water are mixed evenly to obtain the combustion stabilizing and combustion-aiding coal-saving agent.

[0041] Example 2 A combustion-stabilizing and combustion-aiding coal-saving agent, by mass percentage, consists of the following components: 8% oxidant (potassium permanganate and sodium nitrate in a mass ratio of 1:1.5), 5% combustion aid (sodium hydroxide), 10% catalyst (manganese tetroxide, cerium dioxide and ferric chloride in a mass ratio of 1.6:6:1), 3% desulfurizer (calcium hydroxide), 4% calcium magnesium acetate, 3% dispersant (sodium hexametaphosphate), and the balance being water; The preparation method of the combustion stabilizing and combustion-aiding coal-saving agent is the same as in Example 1.

[0042] Example 3 The difference from Example 2 is that the mass ratio of potassium permanganate and sodium nitrate is 1:2.5, while all other aspects are the same as in Example 2.

[0043] Example 4 The difference from Example 2 is that the mass ratio of manganese tetroxide, cerium dioxide and ferric chloride is 2:5:1, while all other aspects are the same as in Example 2.

[0044] Comparative Example 1 The difference from Example 2 is that only potassium permanganate is used as the oxidant, while everything else is the same as Example 2.

[0045] Comparative Example 2 The difference from Example 2 is that the catalyst is manganese tetroxide and cerium dioxide in a mass ratio of 1.6:6, while all other aspects are the same as in Example 2.

[0046] Comparative Example 3 The difference from Example 2 is that the catalyst is manganese tetroxide and ferric chloride in a mass ratio of 1.6:1, while all other aspects are the same as in Example 2.

[0047] The coal-saving agents from Examples 1-4 and Comparative Examples 1-3 were added to bituminous coal at a ratio of 0.1 wt%, and combustion experiments were conducted in a pulverized coal furnace. The coal-saving rate was calculated, and the results are shown in Table 1.

[0048] Table 1 shows the coal-saving effects of the coal-saving agents in Examples 1-4 and Comparative Examples 1-3.

[0049] As can be seen from the data in Table 1, the coal-saving agent provided by this invention has a better coal-saving effect.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A combustion-stabilizing and combustion-aiding coal-saving agent, comprising the following components by mass percentage: 5-10% oxidant, 1-8% combustion aid, 5-15% catalyst, 1-5% desulfurizer, 2-4% calcium magnesium acetate, 1-4% dispersant, and the balance being water; The oxidant includes potassium permanganate and sodium nitrate; the catalyst includes manganese tetroxide, cerium dioxide and ferric chloride.

2. The combustion-stabilizing and combustion-aiding coal-saving agent according to claim 1, characterized in that, The mass ratio of potassium permanganate to sodium nitrate is 1:(1~3).

3. The combustion-stabilizing and combustion-aiding coal-saving agent according to claim 2, characterized in that, The mass ratio of potassium permanganate to sodium nitrate is 1:(1~2).

4. The combustion stabilizing and combustion-aiding coal-saving agent according to claim 1, characterized in that, The mass ratio of manganese tetroxide, cerium dioxide and ferric chloride is (1~2):(4~6):

1.

5. The combustion-stabilizing and combustion-aiding coal-saving agent according to claim 1, characterized in that, The combustion aid includes sodium hydroxide and / or potassium hydroxide.

6. The combustion-stabilizing and combustion-aiding coal-saving agent according to claim 1, characterized in that, The desulfurizing agent includes one or more of calcium oxide, calcium hydroxide, calcium acetate, and calcium carbonate.

7. The combustion-stabilizing and combustion-aiding coal-saving agent according to claim 1, characterized in that, The dispersant includes one or more of sodium hexametaphosphate, ammonium citrate, polyacrylamide, and sodium dodecylbenzenesulfonate.

8. The combustion-stabilizing and combustion-aiding coal-saving agent according to claim 1, characterized in that, The particle size of the oxidant, combustion improver, catalyst, desulfurizer, and calcium magnesium acetate is independently 20~80μm.

9. A method for preparing the combustion-stabilizing and combustion-aiding coal-saving agent according to any one of claims 1 to 8, comprising: An oxidant, combustion improver, catalyst, desulfurizer, calcium magnesium acetate, dispersant, and water are mixed to obtain a combustion stabilizer, combustion improver, and coal-saving agent.

10. The application of the combustion stabilizer and combustion aid according to any one of claims 1 to 8 in coal combustion.

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