Efficient denitration agent for thermal power plant and preparation method of efficient denitration agent

Abstract

The embodiment of the invention discloses a thermal power plant efficient denitration agent and a preparation method thereof, and belongs to the technical field of thermal power plant environmental protection. The efficient denitration agent for the thermal power plant comprises the following raw materials in parts by weight: 10-20 parts of a reducing agent, 30-50 parts of activated carbon, 1-2 parts of a surfactant, 1-10 parts of a solid particle catalyst, 1.5-5 parts of phenolic resin, 1-3 parts of calcium oxide, 1-3 parts of iron oxide and 1-3 parts of aluminum oxide. The solid particle catalyst is prepared from TiO2, MoO3 and V2O5 in a mass ratio of 6: 2: 2; the surface active agent is calcium dodecyl sulfate. When the catalyst is used, NOx in flue gas can be quickly converted, the chemical stability is good, the oxidation resistance is high, and redundant waste materials cannot be generated.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of flue gas denitrification, and specifically to a high-efficiency denitrifying agent for thermal power plants and a preparation method thereof. Background Art

[0002] Nitrogen oxides are one of the main sources of air pollution, and NO and NO2 are important air pollutants. 70% of the nitrogen oxide emissions in China come from the direct combustion of coal, and the power industry is a major coal consumer in China. Therefore, the main source of NOx emissions is thermal power plants. Nitrogen oxides can affect the lungs, making it more difficult for people to resist respiratory diseases such as colds. People with respiratory problems such as asthma patients are more likely to be affected by nitrogen dioxide. For children, nitrogen oxides may cause damage to lung development. Research indicates that long-term inhalation of nitrogen oxides may lead to changes in the lung structure.

[0003] In the existing methods for denitrifying flue gas, the reaction temperature range of the denitrifying agent is relatively narrow. When the denitrifying agent is introduced into high-temperature flue gas, it cannot fully match the reaction temperature of the denitrifying agent, resulting in unsatisfactory denitrification effect. In the prior art, this problem has been solved by adding auxiliary materials, but after the reaction of the auxiliary materials, waste materials that cannot be recycled are generated. Summary of the Invention

[0004] Therefore, the embodiments of the present invention provide a high-efficiency denitrifying agent for thermal power plants and a preparation method thereof to solve the problem of easy generation of waste materials caused by imperfect denitrification technology in the prior art.

[0005] To achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0006] According to the first aspect of the embodiments of the present invention, the present invention provides a high-efficiency denitrifying agent for thermal power plants. The high-efficiency denitrifying agent for thermal power plants comprises the following raw materials in parts by weight: 10-20 parts of a reducing agent, 30-50 parts of activated carbon, 1-2 parts of a surfactant, 1-10 parts of a solid particle catalyst, 1.5-5 parts of phenolic resin, 1-3 parts of calcium oxide, 1-3 parts of iron oxide, and 1-3 parts of aluminum oxide;

[0007] The solid particle catalyst is composed of TiO2, MoO3 and V2O5 with a mass ratio of 6:2:2;

[0008] The surfactant is calcium dodecyl sulfonate.

[0009] Further, the reducing agent is selected from one of melamine and urea.

[0010] Further, the particle size of the activated carbon is 50-100 μm.

[0011] Further, the particle size of the solid particle catalyst is 150 - 200 nm.

[0012] According to the second aspect of the embodiments of the present invention, the present invention provides a preparation method of the above-mentioned high-efficiency denitration agent for thermal power plants, and the preparation method includes the following steps:

[0013] S1. Mix iron oxide, calcium oxide, alumina and a reducing agent evenly, and heat to obtain composition A;

[0014] S2. Mix activated carbon, phenolic resin, surfactant and solid particle catalyst, and heat and stir simultaneously to obtain composition B;

[0015] S3. Mix composition A and composition B with water to obtain a mud, and knead and extrude the mud into a shape;

[0016] S4. Sinter the product obtained in step S3 to obtain the high-efficiency denitration agent for thermal power plants.

[0017] Further, in step S1, the heating temperature is 200 - 400 °C, and the heating time is 1 - 2 h.

[0018] Further, in step S2, the heating temperature is 90 - 120 °C, the stirring speed is 500 - 1000 rpm, and the stirring time is 0.5 - 1 h.

[0019] Further, in step S4, the sintering temperature is 400 - 600 °C, and the sintering time is 12 - 24 h.

[0020] The embodiments of the present invention have the following advantages:

[0021] The high-efficiency denitration agent for thermal power plants of the present invention is a mixture composed of multiple substances, and the main components are inorganic components and organic substances such as iron oxide, activated carbon, urea, and solid particle catalysts with selectivity and catalytic properties. When in use, it can quickly convert NOx in flue gas, has good chemical stability, strong antioxidant ability, and does not produce redundant waste. Specific Embodiments

[0022] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0023] Example 1

[0024] This embodiment provides an efficient denitration agent for thermal power plants, which includes the following raw materials by weight: 10 parts of urea, 30 parts of activated carbon, 2 parts of calcium dodecylsulfonate, 5 parts of solid particle catalyst, 5 parts of phenolic resin, 1 part of calcium oxide, 1 part of iron oxide, and 1 part of alumina;

[0025] Its preparation method includes the following steps:

[0026] S1. Mix iron oxide, calcium oxide, alumina and a reducing agent evenly, and heat them at 200 °C for 2 h to obtain Composition A;

[0027] S2. Mix activated carbon, phenolic resin, calcium dodecylsulfonate and solid particle catalyst, and heat and stir at 120 °C and 1000 rpm for 1 h to obtain Composition B;

[0028] S3. Mix Composition A and Composition B with water to obtain a mud, and knead and extrude the mud into a shape;

[0029] S4. Sinter the product obtained in step S3 at 600 °C for 24 h to obtain an efficient denitration agent for thermal power plants.

[0030] Example 2

[0031] This embodiment provides an efficient denitration agent for thermal power plants, which includes the following raw materials by weight: 20 parts of melamine, 50 parts of activated carbon, 2 parts of calcium dodecylsulfonate, 10 parts of solid particle catalyst, 5 parts of phenolic resin, 2 parts of calcium oxide, 2 parts of iron oxide, and 2 parts of alumina;

[0032] Its preparation method includes the following steps:

[0033] S1. Mix iron oxide, calcium oxide, alumina and a reducing agent evenly, and heat them at 200 - 400 °C for 1 - 2 h to obtain Composition A;

[0034] S2. Mix activated carbon, phenolic resin, calcium dodecylsulfonate and solid particle catalyst, and heat and stir at 90 °C and 500 rpm for 1 h to obtain Composition B;

[0035] S3. Mix Composition A and Composition B with water to obtain a mud, and knead and extrude the mud into a shape;

[0036] S4. Sinter the product obtained in step S3 at 400 °C for 24 h to obtain an efficient denitration agent for thermal power plants.

[0037] Example 3

[0038] This embodiment provides an efficient denitration agent for thermal power plants, which comprises the following raw materials by weight: 20 parts of urea, 40 parts of activated carbon, 2 parts of calcium dodecylbenzenesulfonate, 3 parts of solid particle catalyst, 1.5 parts of phenolic resin, 1 part of calcium oxide, 1 part of iron oxide, and 1 part of alumina;

[0039] Its preparation method comprises the following steps:

[0040] S1. Mix iron oxide, calcium oxide, alumina and a reducing agent evenly, and heat at 300 °C for 1 h to obtain composition A;

[0041] S2. Mix activated carbon, phenolic resin, surfactant and solid particle catalyst, and heat and stir at 100 °C and 1000 rpm for 1 h to obtain composition B;

[0042] S3. Mix composition A and composition B with water to obtain a mud material, and knead and extrude the mud material;

[0043] S4. Sinter the product obtained in step S3 at 600 °C for 24 h to obtain an efficient denitration agent for thermal power plants.

[0044] Comparative Example 1

[0045] This comparative example provides a denitration agent for thermal power plants, which comprises the following raw materials by weight: 5 parts of activated carbon, 2 parts of TiO2, and 80 parts of urea.

[0046] Its preparation method comprises the following steps:

[0047] S1. Mix TiO2 and activated carbon, and slowly stir and mix in a blender at a stirring speed of 100 r / min for 10 min to obtain a first mixture;

[0048] S2. Mix the first mixture and urea and stir at a stirring speed of 200 r / min for 20 min to obtain a denitration agent for thermal power plants.

[0049] Test Example 1

[0050] The efficient denitration agent for thermal power plants prepared in the above embodiment and the conventional urea denitration agent are respectively used for flue gas denitration in a certain denitration test furnace. Without treatment, the average concentration of nitrogen oxides in the flue gas emission is 400 mg / Nm 3 , and the temperature at the upper part of the furnace is 700 - 1200 °C. The denitration performance is detected using Examples 1 - 3 and conventional urea. The denitration temperatures are 700 °C, 800 °C, 900 °C, 1000 °C, 1100 °C, and 1200 °C in sequence. The denitration efficiency is statistically shown in Table 1 below:

[0051] Table 1

[0052]

[0053] It can be seen from the results that, compared with the traditional urea denitration agent, the high-efficiency denitration agent for thermal power plants of the present invention has a significant improvement in denitration ability at various temperatures.

[0054] Although the present invention has been described in detail with general descriptions and specific embodiments in the above text, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A highly efficient denitrification agent for thermal power plants, characterized in that: The high-efficiency denitrification agent for thermal power plants comprises the following raw materials by weight: 10-20 parts of reducing agent, 30-50 parts of activated carbon, 1-2 parts of surfactant, 1-10 parts of solid particle catalyst, 1.5-5 parts of phenolic resin, 1-3 parts of calcium oxide, 1-3 parts of iron oxide, and 1-3 parts of aluminum oxide; The solid particle catalyst is composed of TiO2, MoO3 and V2O5 in a mass ratio of 6:2:2; The surfactant is calcium dodecyl sulfonate.

2. The high-efficiency denitrification agent for thermal power plants according to claim 1, characterized in that: The reducing agent is selected from one of melamine and urea.

3. The high-efficiency denitrification agent for thermal power plants according to claim 1, characterized in that: The particle size of the activated carbon is 50-100 μm.

4. The high-efficiency denitrification agent for thermal power plants according to claim 1, characterized in that: The particle size of the solid particle catalyst is 150-200 nm.

5. The method for preparing a high-efficiency denitrification agent for a thermal power plant according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: S1, mixing iron oxide, calcium oxide, aluminum oxide and a reducing agent uniformly, and heating to obtain a composition A; S2, mixing activated carbon, phenolic resin, surfactant, and solid particle catalyst, and heating and stirring to obtain composition B; S3, adding water to the composition A and the composition B to mix to obtain a clay material, and kneading and extruding the clay material; S4, sintering the product obtained in step S3 to obtain the high-efficiency denitrification agent for thermal power plants.

6. The preparation method according to claim 5, characterized in that: In step S1, the heating temperature is 200-400°C, and the heating time is 1-2h.

7. The preparation method according to claim 5, characterized in that: In step S2, the heating temperature is 90-120°C, the stirring speed is 500-1000rpm, and the stirring time is 0.5-1h.

8. The preparation method according to claim 5, characterized in that: In step S4, the sintering temperature is 400-600° C., and the sintering time is 12-24 hours.

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