Method for preparing coal-saving agent by using metal processing wastewater

Abstract

The application discloses a method for preparing a coal-saving agent by using metal treatment wastewater, and comprises the following steps: preparing the coal-saving agent by compounding metal treatment wastewater, penetration and dispersion components, emulsification components, catalytic components and oxidation components; and spraying 0.05%-0.1% of the coal-saving agent in the coal, so that the initial combustion temperature of the coal is reduced by 20-50 DEG C, the burnout temperature is reduced by 20-60 DEG C, and the carbon content of the ash is reduced by more than 5%. The application applies the metal treatment wastewater to the production of the coal-saving agent, changes waste into treasure, promotes the recycling of resources, and realizes harmless treatment of resources.

Description

Technical Field

[0001] This invention belongs to the field of coal combustion additive technology, specifically relating to a method for preparing a coal-saving agent using metal-treated wastewater. Background Technology

[0002] Coal is one of my country's main energy and chemical raw materials, and is the most widely used energy source in modern industry. In cities and surrounding areas with a high concentration of power plant industrial boilers and commercial boilers, the low thermal efficiency of coal-fired boilers means that the combustion equipment cannot completely burn the supplied coal. Incompletely burned coal, carrying harmful substances such as sulfur and nitrates, is emitted with the smoke and dust, causing environmental pollution from black smoke and slag, as well as significant energy loss. Furthermore, incomplete combustion leads to the accumulation of large amounts of ash and scale inside the furnace. Most existing coal-fired boilers suffer from the disadvantage of being difficult to burn. As global coal reserves dwindle and coal prices rise, national and relevant departments are imposing increasingly stringent requirements on coal combustion emissions. To protect the environment and fully utilize energy, scientists worldwide are continuously researching energy-saving technologies, leading to the development of coal-saving agents.

[0003] Coal-saving agents are mainly formulated from various chemical raw materials such as oxygenating agents, modifiers, catalysts, combustion improvers, smoke suppressants, expanding agents, and sulfur-fixing agents. They are used to improve the thermal efficiency of coal, thereby achieving energy conservation and emission reduction. High-performance coal-saving agents can greatly improve boiler combustion efficiency, reduce environmental pollution, extend boiler service life, and reduce costs for coal-using enterprises.

[0004] During heat treatment, processing, storage, and transportation, metals oxidize under the influence of oxygen, easily forming an uneven oxide layer, which is also affected by other oily substances and impurities. Therefore, to improve the luster of metal surfaces and enhance their corrosion resistance, heat resistance, and ductility, as well as extend their service life, it is often necessary to treat the metal surface through methods such as pickling, alkali washing, phosphating, and ceramic coating.

[0005] Currently, commonly used alkaline compounds for degreasing metal surfaces include NaOH, Na₂CO₃, Na₃PO₄, and Na₂SiO₃. However, for heavily oiled parts, organic solvents such as kerosene, gasoline, acetone, toluene, trichloroethylene, and carbon tetrachloride are used first for degreasing, followed by chemical alkaline degreasing. To remove certain mineral oils, a certain amount of emulsifier, such as OP emulsifier, AE emulsifier, or triethanolamine oleic acid soap, is usually added to the degreasing solution. Therefore, the cleaning wastewater and replacement wastewater generated during the degreasing process are alkaline wastewater, often containing oils and other organic compounds. Acid pickling and rust removal commonly use hydrochloric acid and sulfuric acid, so the cleaning water generated during the acid pickling and rust removal process generally has a high acidity. Whether it is alkaline degreasing wastewater or acidic rust removal cleaning water, direct discharge without treatment will cause serious environmental pollution. If the above-mentioned wastewater is treated and reused, the harm of degreasing and rust removal wastewater can be greatly reduced, turning waste into treasure and generating considerable economic and environmental benefits. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a method for preparing a coal-saving agent using metal treatment wastewater. The coal-saving agent is prepared by compounding metal treatment wastewater, a penetrating and dispersing component, an emulsifying component, a catalytic component, and an oxidizing component. Spraying 0.05%-0.1% of this agent into coal can reduce the initial combustion temperature of coal by 20-50℃, reduce the burnout temperature by 20-60℃, and reduce the carbon content of ash residue by more than 5%. This invention applies metal treatment wastewater to the production of the coal-saving agent, turning waste into treasure, promoting resource recycling, and truly achieving harmless resource treatment.

[0007] To achieve the above effects, the present invention adopts the following technical solution: a method for preparing a coal-saving agent using metal treatment wastewater, which is made from the following raw materials in parts by weight: 60-85 parts of metal treatment wastewater, 0.5-1 parts of penetrating dispersion component, 0.5-1 parts of emulsifying component, 5-15 parts of catalytic component, and 5-15 parts of oxidizing component.

[0008] Furthermore, the aforementioned metal treatment wastewater comprises: collecting alkaline and acidic metal surface treatment solutions. The alkaline solution is wastewater from metal surfaces that have undergone organic solvent degreasing followed by chemical alkaline degreasing. This wastewater is evaporated and concentrated, then filtered to remove insoluble matter, yielding treatment solution A. Treatment solution A has a calorific value of 300-500 kcal / kg, a solid content of 3-5%, and a pH of 9-11. The acidic solution is pickling and rust removal wastewater. This wastewater is concentrated using the same method and then filtered to obtain treatment solution B. Treatment solution B has a solid content of 2-4% and a pH of 3-5.

[0009] First, the alkaline metal surface treatment solution is concentrated, and insoluble matter is filtered out to obtain treatment solution A. The acidic metal surface treatment solution is concentrated in the same way and then filtered to obtain treatment solution B. The mass ratio of treatment solution A to treatment solution B is 1-1.5:0.8-1.

[0010] Furthermore, the aforementioned penetrating and dispersing component is one of polyoxyethylene ether, alkylphenol polyoxyethylene ether, and polyether.

[0011] Furthermore, the emulsifying component mentioned above is one of sodium alkylbenzene sulfonate, emulsifier AEO, and penetrant JFC.

[0012] Furthermore, the aforementioned catalytic component is one of titanium trichloride, nickel sulfate, and cerium nitrate.

[0013] Furthermore, the aforementioned oxidizing component is one of potassium permanganate, potassium chlorate, and sodium hypochlorite.

[0014] Furthermore, the preparation method of the above-mentioned cement coal-saving agent is characterized by starting the stirrer, sequentially adding the catalytic component, oxidation component, penetration dispersion component and emulsifying component to the B treatment liquid, and mixing them evenly; then slowly adding the A treatment liquid and mixing it evenly.

[0015] Metal treatment wastewater, containing organic substances such as kerosene and oil stains, can generate heat during coal combustion, thereby increasing the calorific value of coal and reducing coal consumption. Simultaneously, the presence of inorganic salts such as NaOH, Na₂CO₃, Na₃PO₄, and Na₂SiO₃ helps to fix sulfur. The added oxidizing components, such as potassium permanganate, potassium chlorate, and sodium hypochlorite, when sprayed onto the coal surface, allow the effective components of the coal-saving agent to quickly penetrate into the coal's core pores, greatly improving coal transport fluidity, reducing "coal bridging," and stimulating coal combustion activity for more complete combustion. Components such as titanium trichloride, nickel sulfate, and cerium nitrate act as combustion-supporting catalysts, increasing molecular activity, lowering ignition temperature, accelerating the release of internal energy, and improving coal combustion performance.

[0016] The following points should be noted when using this product: 1. The dosage of this cement coal-saving agent should be calculated based on the total mass of coal, and the dosage should be 0.05%-0.1%; 2. The mixing method is spraying, that is, the coal-saving agent should be evenly sprayed onto the surface of the coal according to the recommended ratio of the total mass of coal, and then thoroughly mixed using mixing equipment; 3. This product should be stored in a cool and ventilated place, and protected from rain and direct sunlight.

[0017] Technical effects of the present invention:

[0018] 1. Under the synergistic promoting effects of metal treatment wastewater, penetrating dispersion components, emulsifying components, catalytic components, and oxidizing components, the prepared coal-saving agent can improve furnace combustion conditions, enhance coal seam permeability, ensure complete coal combustion, increase coal combustion thermal efficiency, reduce smoke and dust emissions, improve heat transfer efficiency, fix sulfur and reduce smoke, reduce CO and SO2 emissions, and reduce environmental pollution, thereby achieving the goals of combustion assistance, sulfur fixation, energy saving, and desulfurization. Spraying 0.05%-0.1% of this coal-saving agent into coal can reduce the initial combustion temperature of coal by 20-50℃, reduce the burnout temperature by 20-60℃, and reduce the carbon content of ash residue by more than 5%.

[0019] 2. This invention applies metal treatment wastewater to the production of a coal-saving agent, turning waste into treasure and providing an effective way to utilize metal treatment wastewater. Furthermore, the product has a simple production process and a shelf life of over one year, making it suitable for industrial production. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these embodiments. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the protection scope of this invention.

[0021] Alkaline and acidic metal surface treatment solutions are collected. The alkaline solution is wastewater from metal surfaces that have undergone organic solvent degreasing followed by chemical alkaline degreasing. This wastewater is evaporated and concentrated, then filtered to remove insoluble matter, yielding solution A. Solution A has a calorific value of 300-500 kcal / kg, a solid content of 3-5%, and a pH of 9-11. The acidic solution is pickling and rust removal wastewater. This wastewater is concentrated using the same method and then filtered to obtain solution B. Solution B has a solid content of 2-4% and a pH of 3-5.

[0022] Example 1

[0023] 1. Preparation of coal-saving agents

[0024] First, add 400 kg of treatment solution B to the mixer and start stirring. Then, add 80 kg of cerium nitrate to the mixer and stir for 5 minutes until evenly mixed. Next, add 100 kg of potassium permanganate to the mixer and stir for 5 minutes. Then, add 10 kg of alkylphenol polyoxyethylene ether to the mixer and stir for 5 minutes. Next, slowly add 10 kg of AEO to the mixer and stir for 10 minutes. Finally, slowly add 400 kg of treatment solution A to the mixer and stir together for 5 minutes to obtain the coal-saving agent of this application.

[0025] 2. Comparative test using the coal-saving agent of this application:

[0026] The coal-saving agent obtained above was added to coal at a dosage of 0.1% of the coal mass percentage, and the same coal was subjected to thermogravimetric analysis with both coal without the coal-saving agent of this invention and coal with 0.1% of the YNY-01 type coal-saving agent from a competitor in the market.

[0027] The specific method is as follows: First, weigh 5 kg of coal and grind it using a standard small mill (500mm*500mm) until the residue on an 80μm sieve is approximately 16%. Weigh 50g of coal powder, 5ml of deionized water, and corresponding amounts of the coal-saving agent of this invention and similar coal-saving agents. Mix the coal-saving agent with the deionized water first, then mix it with the coal powder. Then, grind each mixture separately using a high-speed pulverizer for 1 minute to obtain different coal powder samples for thermogravimetric analysis comparison. The relevant technical parameters of the coal are shown in Table 1, and the thermogravimetric analysis results are shown in Table 2.

[0028] Table 1 Technical Indicators of Coal

[0029] Received basal heat Moisture content Ash Volatile matter Fixed carbon 5200kcal / kg 9.0％ 24％ 26％ 46.5％

[0030] Table 2 Comparison of Coal Thermogravimetric Analysis

[0031] project Initial combustion temperature (°C) Burnout temperature (°C) Carbon content of ash (%) <![CDATA[Composite Index (×10 -7 )]]> benchmark 385.8 580.6 20.5 5.32 Product of this invention 360.5 558.5 15.3 5.49 YNY-01 product 375.9 570.6 17.8 5.43

[0032] As shown in Table 2, after using the coal-saving agent of this invention, the initial combustion temperature of coal decreased by 25.3℃, the burnout temperature decreased by 22.1℃, and the carbon content of ash decreased from 20.5% to 15.3%. Moreover, all indicators are significantly better than those of YNY-01 products in the same industry.

[0033] Example 2:

[0034] First, add 420 kg of treatment solution B to the mixer and start stirring. Then, add 60 kg of cerium nitrate to the mixer and stir for 5 minutes. Next, add 80 kg of potassium permanganate to the mixer and stir for 5 minutes. Then, add 5 kg of alkylphenol polyoxyethylene ether to the mixer and stir for 5 minutes. Finally, slowly add 5 kg of AEO to the mixer and stir for 10 minutes. Finally, slowly add 430 kg of treatment solution A to the mixer and stir for 5 minutes to obtain the coal-saving agent of this application.

[0035] Example 3:

[0036] First, add 405 kg of treatment solution B to the mixer and start stirring. Then, add 50 kg of cerium nitrate to the mixer and stir for 5 minutes. Next, add 80 kg of potassium permanganate to the mixer and stir for 5 minutes. Then, add 5 kg of alkylphenol polyoxyethylene ether to the mixer and stir for 5 minutes. Finally, slowly add 10 kg of AEO to the mixer and stir for 10 minutes. Finally, slowly add 445 kg of treatment solution A to the mixer and stir for 5 minutes to obtain the coal-saving agent of this application.

[0037] Example 4:

[0038] First, add 350 kg of treatment solution B to the mixer and start stirring. Then, add 120 kg of cerium nitrate to the mixer and stir for 5 minutes. Next, add 50 kg of potassium permanganate to the mixer and stir for 5 minutes. Then, add 5 kg of alkylphenol polyoxyethylene ether to the mixer and stir for 5 minutes. Finally, slowly add 10 kg of AEO to the mixer and stir for 10 minutes. Finally, slowly add 465 kg of treatment solution A to the mixer and stir for 5 minutes to obtain the coal-saving agent of this application.

[0039] The above embodiments are merely examples illustrating the explanation, specific implementation methods, and effects of the present invention, and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to the invention without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A method for preparing a coal-saving agent using metal-treated wastewater, characterized in that, The coal-saving agent is made from the following raw materials in parts by weight: 60-85 parts of metal treatment wastewater, 0.5-1 part of penetrating dispersion component, 0.5-1 part of emulsifying component, 5-15 parts of catalytic component, and 5-15 parts of oxidizing component. The metal treatment wastewater is as follows: alkaline metal surface treatment solution and acidic metal surface treatment solution are collected, concentrated and filtered to obtain treatment solution A and treatment solution B, which are then mixed and used at a mass ratio of 1-1.5:0.8-1. The alkaline metal surface treatment solution is wastewater from metal surfaces that have undergone organic solvent degreasing followed by chemical alkaline degreasing. The wastewater after chemical alkaline degreasing is then evaporated and concentrated, and then filtered to remove insoluble matter to obtain treatment solution A. Treatment solution A has a calorific value of 300-500 kcal / kg, a solid content of 3-5%, and a pH of 9-11. The acidic metal surface treatment solution is pickling and rust removal wastewater, which is evaporated and concentrated, and then filtered to remove insoluble matter to obtain treatment solution B. Treatment solution B has a solid content of 2-4% and a pH of 3-5. The permeation and dispersion component is one of polyoxyethylene ether and polyether; The emulsifying component is one of sodium alkylbenzene sulfonate, emulsifier AEO, and penetrant JFC; The catalytic component is one of titanium trichloride, nickel sulfate, and cerium nitrate. The oxidizing component is one of potassium permanganate, potassium chlorate, and sodium hypochlorite.

2. The method for preparing coal-saving agents from metal treatment wastewater as described in claim 1, characterized in that, Start stirring, add the catalytic component, oxidation component, penetration dispersion component and emulsifying component to the B treatment solution in sequence, and mix evenly; then slowly add the A treatment solution and mix thoroughly.

3. The coal-saving agent prepared by the method of claim 2.

4. The method of using the coal-saving agent according to claim 3, characterized in that, Spray the coal-saving agent evenly onto the coal surface at a ratio of 0.05%-0.1% of the total coal mass, and mix thoroughly using a mixing device.