Terahertz materials suitable for fixed source fuel combustion

Abstract

The application discloses a terahertz material suitable for emission reduction of nitrogen oxides and volatile organic compounds in fixed source fuel combustion, which is composed of silicon dioxide, diiron trioxide, calcium tungstate and a terahertz active additive; the terahertz active additive is graphene oxide bonded silica gel and / or nano silicon-based oxide. The application is suitable for emission reduction of nitrogen oxides and volatile organic compounds in fixed source fuel combustion, and can significantly reduce the emission of nitrogen oxides and volatile organic compounds in fixed source fuel combustion without changing the combustion conditions, so that the emission reduction effect is good and stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of terahertz materials, in particular to a terahertz material suitable for reducing the emission of nitrogen oxides and volatile organic compounds in fixed source fuel combustion. BACKGROUND

[0002] Terahertz (THz) waves refer to electromagnetic waves with a frequency of 0.1-10 THz (wavelength of 30 μm~3 mm), which are between microwave radiation and infrared radiation in the electromagnetic spectrum, and belong to the far infrared and sub-millimeter wave category. Due to the low photon energy, high resolution, and strong transmission ability of terahertz waves, they have broad application prospects in many fields, such as communication, medical diagnosis, safety inspection, non-destructive testing, and pollution detection.

[0003] Fixed source fuel refers to fuel that is burned in a fixed position, mainly including fuel used in industrial production, such as coal and boiler gas, while mobile source fuel mainly refers to fuel used in transportation, such as gasoline, diesel, and aviation fuel used in motor vehicles, ships, and aircraft.

[0004] Previous studies have shown that terahertz materials can promote the reduction of nitrogen oxides and volatile organic compounds released during fixed source fuel combustion. However, the mechanism of terahertz materials in promoting the reduction of nitrogen oxides and volatile organic compounds in fixed source fuel combustion is not clear. The existing terahertz materials do not have ideal application effects in reducing the emission of nitrogen oxides and volatile organic compounds in fixed source fuel combustion, mainly in two aspects: the existing terahertz materials do not have ideal effects in reducing the emission of nitrogen oxides and volatile organic compounds in fixed source fuel combustion, and the stability of the reduction effect is not good. For example, the existing terahertz materials may have good effects in reducing the emission of nitrogen oxides and volatile organic compounds in mobile source fuel, but when used in fixed source fuel, the reduction of nitrogen oxides and volatile organic compounds is not ideal, or the reduction effect is not stable at different stages. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a terahertz material with stable combustion source nitrogen oxide and volatile organic compound reduction efficiency, to solve the problem of poor stability of the reduction efficiency of existing terahertz materials in reducing the emission of nitrogen oxides and volatile organic compounds in fixed source combustion.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] The terahertz material suitable for reducing the emission of nitrogen oxides and volatile organic compounds in fixed source fuel combustion is composed of silicon dioxide, diiron trioxide, calcium tungstate, and a terahertz active additive.

[0008] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz active assistant is graphene oxide bonded silica gel.

[0009] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz material is composed of the following components in parts by weight: 30-40 parts by weight of silicon dioxide, 10-30 parts by weight of diiron trioxide, 10-20 parts by weight of calcium tungstate, and 5-15 parts by weight of graphene oxide bonded silica gel.

[0010] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz material is composed of the following components in parts by weight: 30 parts by weight of silicon dioxide, 20 parts by weight of diiron trioxide, 10 parts by weight of calcium tungstate, and 12 parts by weight of graphene oxide bonded silica gel.

[0011] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz active assistant is nano silicon-based oxide.

[0012] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz material is composed of the following components in parts by weight: 20-50 parts by weight of silicon dioxide, 10-30 parts by weight of diiron trioxide, 10-20 parts by weight of calcium tungstate, and 10-20 parts by weight of nano silicon-based oxide.

[0013] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz material is composed of the following components in parts by weight: 50 parts by weight of silicon dioxide, 30 parts by weight of diiron trioxide, 20 parts by weight of calcium tungstate, and 20 parts by weight of nano silicon-based oxide.

[0014] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz active assistant is graphene oxide bonded silica gel and nano silicon-based oxide.

[0015] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz material is composed of the following components in parts by weight: 20-50 parts by weight of silicon dioxide, 10-25 parts by weight of diiron trioxide, 10-20 parts by weight of calcium tungstate, 3-10 parts by weight of graphene oxide bonded silica gel, and 5-15 parts by weight of nano silicon-based oxide.

[0016] The terahertz material for reducing emission of nitrogen oxides and volatile organic compounds in fuel combustion of stationary sources, wherein the terahertz material is composed of the following components in parts by weight: 40 parts by weight of silicon dioxide, 10 parts by weight of diiron trioxide, 10 parts by weight of calcium tungstate, 4 parts by weight of graphene oxide bonded silica gel, and 8 parts by weight of nano silicon-based oxide.

[0017] The technical scheme of the present application achieves the following beneficial technical effects:

[0018] 1. In the present application, silicon dioxide, diiron trioxide and calcium tungstate are selected as the main components of the terahertz material suitable for the reduction of nitrogen oxides and volatile organic compounds in fixed source fuel combustion, and graphene oxide bonded silica gel and / or nano silicon-based oxide are added as active additives of the terahertz material, which can effectively improve the emissivity of the terahertz material and the stability of the reduction efficiency of nitrogen oxides and volatile organic compounds in the fuel combustion tail gas. The terahertz material suitable for the reduction of nitrogen oxides and volatile organic compounds in fixed source fuel combustion is used for the reduction of nitrogen oxides and volatile organic compounds in fixed source fuel combustion, and under the premise of not changing the combustion conditions, it can significantly reduce the emission of nitrogen oxides and volatile organic compounds in fixed source fuel combustion. Not only is the reduction effect good, but also the reduction effect is stable.

[0019] 2. In the present application, nano-based oxide has a larger specific surface area than ordinary silicon dioxide, and there are a large number of unsaturated bonds and different bonding state hydroxyl groups on its surface, which can interact with the metal elements in calcium tungstate and iron trioxide, excite and improve the terahertz radiation performance of materials such as silicon dioxide, diiron trioxide and calcium tungstate. When graphene oxide bonded silica gel is added, the special surface and lattice structure of the graphene oxide bonded silica gel can enhance the interaction between the nano-based oxide and the metal elements in calcium tungstate and iron trioxide and improve the stability of this interaction, not only can significantly improve the emissivity of the terahertz material, but also can make the reduction efficiency of nitrogen oxides and volatile organic compounds in the fixed source fuel combustion process more stable. DETAILED DESCRIPTION

[0020] Example 1

[0021] The terahertz material suitable for the reduction of nitrogen oxides and volatile organic compounds in fixed source fuel combustion in this example is composed of the following components by weight: 30 parts by weight of silicon dioxide, 20 parts by weight of diiron trioxide, 10 parts by weight of calcium tungstate, and 12 parts by weight of graphene oxide bonded silica gel. In this example, the silicon dioxide, diiron trioxide and calcium tungstate are all sieved through a 200 mesh sieve, and the graphene oxide bonded silica gel is prepared by the method in patent CN104489922A.

[0022] The terahertz material prepared using the components described in this embodiment (mixed, sintered, and subjected to terahertz irradiation treatment) achieved an infrared emissivity of 86.3%. When this terahertz material was used in boiler gas combustion, the emissions of nitrogen oxides (NOx) and volatile organic compounds (VOCs) were measured. The results showed that, under the same operating conditions, compared to not using the terahertz material, using the terahertz material significantly reduced the emissions of NOx and VOCs released from boiler gas combustion. After continuous application to the boiler gas combustion process for one week, the reduction in NOx and VOC emissions fluctuated little. Within one week, the terahertz material reduced NOx emissions by an average of 68.7% and VOC emissions by an average of 88.6%. The terahertz material demonstrated stable and good efficiency in promoting NOx and VOC emission reduction.

[0023] Example 2

[0024] In this embodiment, the terahertz material suitable for reducing nitrogen oxides and volatile organic compound emissions from stationary fuel combustion is composed of the following components in parts by weight: 50 parts by weight of silicon dioxide, 30 parts by weight of ferric oxide, 20 parts by weight of calcium tungstate, and 20 parts by weight of nano-silicon-based oxide. In this embodiment, silicon dioxide, ferric oxide, and calcium tungstate are all sieved through a 200-mesh sieve. The nano-silicon-based oxide used is a commercially available nano-sized silicon dioxide material with a specific surface area greater than 550 m². 2 / g, its structural formula is SiO 2-X X is between 0.4 and 0.8.

[0025] The terahertz material prepared using the components described in this embodiment (mixed, sintered, and subjected to terahertz irradiation) achieved an infrared emissivity of 89.2%. When this terahertz material was used in boiler gas combustion, the emissions of nitrogen oxides and volatile organic compounds (VOCs) were measured. The results showed that, under the same operating conditions, compared to not using the terahertz material, using the terahertz material significantly reduced the emissions of nitrogen oxides and VOCs released from boiler gas combustion. After continuous application to the boiler gas combustion process for one week, the reduction in nitrogen oxides and VOCs showed little fluctuation. Within one week, the terahertz material reduced nitrogen oxide emissions by an average of 74.3% and VOCs by an average of 91.6%. The terahertz material demonstrated good and stable performance in promoting nitrogen oxide and VOC emission reduction, but its performance stability was slightly better than that of Example 1.

[0026] Example 3

[0027] In this embodiment, the terahertz material suitable for reducing nitrogen oxides and volatile organic compound emissions from stationary source fuel combustion is composed of the following components in parts by weight: 40 parts by weight of silicon dioxide, 10 parts by weight of ferric oxide, 10 parts by weight of calcium tungstate, 4 parts by weight of graphene oxide-bonded silica gel, and 8 parts by weight of nano-silicon-based oxide. In this embodiment, silicon dioxide, ferric oxide, and calcium tungstate are all sieved through a 200-mesh sieve. The graphene oxide-bonded silica gel is prepared using the method described in patent CN104489922A. The nano-silicon-based oxide used is a commercially available silicon dioxide nanoscale material with a specific surface area greater than 550 m². 2 / g, its structural formula is SiO 2-X X is between 0.4 and 0.8.

[0028] The terahertz material prepared using the components described in this embodiment (mixed, sintered, and subjected to terahertz irradiation) achieved an infrared emissivity of 93.7%. When this terahertz material was used in boiler gas combustion, the emissions of nitrogen oxides (NOx) and volatile organic compounds (VOCs) were measured. The results showed that, under the same operating conditions, compared to not using the terahertz material, using the terahertz material significantly reduced the emissions of NOx and VOCs released from boiler gas combustion. After continuous application to the boiler gas combustion process for one week, the reduction in NOx and VOC emissions fluctuated little. Within one week, the terahertz material reduced NOx emissions by an average of 80.1% and VOC emissions by an average of 95.8%. The terahertz material demonstrated stable and good efficiency in promoting NOx and VOC emission reduction, but its efficiency stability was better than that of Example 2.

[0029] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A terahertz material suitable for reducing nitrogen oxides and volatile organic compounds emissions from stationary fuel combustion, characterized in that, It is composed of a mixture of silicon dioxide, ferric oxide, calcium tungstate and terahertz active additives; when the terahertz active additive is graphene oxide bonded silica gel, the terahertz material is composed of the following components in parts by weight: 30-40 parts by weight of silicon dioxide, 10-30 parts by weight of ferric oxide, 10-20 parts by weight of calcium tungstate, and 5-15 parts by weight of graphene oxide bonded silica gel.

2. The terahertz material for reducing nitrogen oxides and volatile organic compounds from stationary fuel combustion according to claim 1, characterized in that, It is composed of the following components in parts by weight: 30 parts by weight of silicon dioxide, 20 parts by weight of ferric oxide, 10 parts by weight of calcium tungstate, and 12 parts by weight of graphene oxide bonded silica.

3. A terahertz material suitable for reducing nitrogen oxides and volatile organic compound emissions from stationary fuel combustion, characterized in that: It is composed of a mixture of silicon dioxide, ferric oxide, calcium tungstate and terahertz active additives; when the terahertz active additive is nano-silicon-based oxide, the terahertz material is composed of the following components in parts by weight: 20-50 parts by weight of silicon dioxide, 10-30 parts by weight of ferric oxide, 10-20 parts by weight of calcium tungstate, and 10-20 parts by weight of nano-silicon-based oxide.

4. The terahertz material for reducing nitrogen oxides and volatile organic compounds from stationary fuel combustion according to claim 3, characterized in that, It is composed of the following components in parts by weight: 50 parts by weight of silicon dioxide, 30 parts by weight of ferric oxide, 20 parts by weight of calcium tungstate, and 20 parts by weight of nano-silicon-based oxide.

5. A terahertz material suitable for reducing nitrogen oxides and volatile organic compound emissions from stationary fuel combustion, characterized in that, It is composed of a mixture of silicon dioxide, ferric oxide, calcium tungstate and terahertz active additives; when the terahertz active additives are graphene oxide bonded silica and nano-silicon-based oxides, the terahertz material is composed of the following components in parts by weight: 20-50 parts by weight of silicon dioxide, 10-25 parts by weight of ferric oxide, 10-20 parts by weight of calcium tungstate, 3-10 parts by weight of graphene oxide bonded silica, and 5-15 parts by weight of nano-silicon-based oxides.

6. The terahertz material for reducing nitrogen oxides and volatile organic compounds from stationary fuel combustion according to claim 5, characterized in that, It is composed of the following components in parts by weight: 40 parts by weight of silicon dioxide, 10 parts by weight of ferric oxide, 10 parts by weight of calcium tungstate, 4 parts by weight of graphene oxide bonded silica, and 8 parts by weight of nano-silicon-based oxide.