CN-121988587-A - Comprehensive treatment method of coking waste

Abstract

The invention discloses a comprehensive treatment method of coking waste, which belongs to the technical field of coking waste treatment and comprises the steps of S1, analyzing physical characteristics and chemical components of each component in coking waste, putting the coking waste into a mixing tank, introducing high-pressure steam for mixing and stirring to prepare waste slurry with the water content of 30% -40%, S2, carrying out catalytic pulping synthesis, conveying the waste slurry into a pulping reaction tank, adding 2% -5% of a composite catalyst according to the mass of the slurry, stirring and reacting for 2 hours to 3 hours under the conditions of 80 ℃ -120 ℃ and micro negative pressure, S3, carrying out synergistic carbonization and gasification, namely pumping the material subjected to catalytic pulping into a carbonization and gasification furnace, carrying out carbonization and gasification reaction for 30 minutes to 50 minutes under the medium temperature conditions of limited air and 500 ℃ -600 ℃, S4, cooling and crushing carbonized and gasified carbon-rich solid residues, and taking the carbonized and gasified carbon-rich solid residues as industrial alternative fuels, or adsorbing materials or soil improvers.

Inventors

• ZHENG MENG
• SONG JIAN
• GUO YUJING
• LI WEI
• LI CHENGLONG
• LI YANFEI

Assignees

• 天津铁厂有限公司

Dates

Publication Date

20260508

Application Date

20251222

Claims (10)

1. 1. A comprehensive treatment method of coking waste is characterized by comprising the following steps: s1, analyzing physical characteristics and chemical components of each component in the coking waste, putting the coking waste into a mixing tank, introducing high-pressure steam to mix and stir, and preparing waste slurry with the water content of 30% -40%; S2, carrying out catalytic slurrying synthesis, namely conveying waste slurry into a slurrying reaction kettle, adding 2% -5% of composite catalyst according to the mass of the slurry, and stirring and reacting for 2-3 hours under the condition of 80-120 ℃ and micro negative pressure; S3, cooperatively carbonizing and gasifying, namely pumping the material subjected to catalytic pulping into a carbonizing and gasifying furnace, and carbonizing and gasifying for 30-50 minutes under the medium temperature condition of introducing limited air and 500-600 ℃; S4, recycling residues, namely cooling and crushing the carbonized and gasified carbon-rich solid residues, and taking the carbon-rich solid residues as industrial alternative fuels, or adsorption materials or soil improvers.
2. 2. The integrated treatment method of coking waste according to claim 1, wherein the coking waste comprises one or more of tar residues, acid tar, biochemical sludge, waste activated carbon, and waste desulfurizing agent.
3. 3. The comprehensive treatment method of coking waste according to claim 2, wherein S1 comprises the steps of adding tar residue, acid tar, biochemical sludge, waste activated carbon and waste desulfurizing agent into a mixing tank according to a ratio of 4:2:2:1:1.
4. 4. The method for comprehensively treating coking waste according to claim 1, wherein S1 comprises adding a lime conditioner to neutralize acidic substances in the coking waste in the mixing tank according to the input amount of the acid tar.
5. 5. The method for comprehensively treating coking waste according to claim 1, wherein in S2, the composite catalyst is composed of an iron-based oxide, an alkali metal compound, and a porous carrier.
6. 6. The integrated treatment method for coking waste according to claim 5, wherein the iron-based oxide is iron oxide, the alkali metal compound is potassium carbonate, and the porous carrier is a porous carrier.
7. 7. The comprehensive treatment method of coking waste according to claim 5, wherein the composite catalyst is added in proportion, namely iron oxide, potassium carbonate and bentonite=4:2:4.
8. 8. The integrated treatment method of coking waste according to claim 1, wherein the oxygen concentration of the limited air in S3 is 25%.
9. 9. The integrated treatment method of coking waste according to claim 1, further comprising a full-process pollution control: Introducing the flue gas generated in the carbonization and gasification process into a coking existing flue gas desulfurization and denitrification system; the trace volatile organic matters generated in each link are collected through a closed pipeline and sent into a coke oven to serve as combustion air, or sent into a volatile organic matter treatment system to be collected and purified.
10. 10. The comprehensive treatment method of coking waste according to claim 1, wherein the micro negative pressure is-0.02 MPa.

Description

Comprehensive treatment method of coking waste Technical Field The invention belongs to the technical field of coking waste treatment, and particularly relates to a comprehensive treatment method of coking waste. Background The coking industry produces a great amount of solid and semisolid wastes with complex components, toxicity and harm while producing coke, coal gas and chemical products. The wastes have various types and different properties, are difficult to treat and form serious threat to the environment and human health. Mainly comprises the following categories: The tar residue mainly comes from the tar-ammonia water separation process, is rich in a large amount of toxic organic matters such as heavy tar, coal dust, polycyclic aromatic hydrocarbon and the like, has high viscosity and is difficult to degrade, and is classified as dangerous waste, and soil and groundwater are extremely easy to pollute if the tar residue is improperly treated. Acid tar is produced in the crude benzene pickling process, is black brown and sticky, has complex components, contains residual sulfuric acid, benzene series, organic sulfide and polymer, has stronger corrosiveness and toxicity, and is difficult to effectively treat by the traditional method. Biochemical sludge, which is a biochemical treatment unit from a sewage treatment station, is rich in high-concentration organic matters, cyanide, polycyclic aromatic hydrocarbon and microbial thalli, is easy to be corroded and smelly, has poor stability, belongs to dangerous wastes, and is accumulated for a long time with infiltration and volatilization pollution risks. The waste active carbon/waste desulfurizing agent is mainly used in the waste gas and waste water purifying process, and is used for absorbing various pollutants such as phenol, cyanogen, sulfide and the like which are loaded after saturation, and is difficult to regenerate, and secondary release of the absorbing substances can be caused if the waste active carbon/waste desulfurizing agent is improperly treated after being abandoned. At present, the common treatment modes of the wastes still have obvious defects: The separate disposal mode, such as incineration, can realize volume reduction and weight reduction, but has high running cost, and secondary pollutants such as dioxin, oxysulfide and the like are easy to generate under the condition of insufficient combustion, and meanwhile, valuable components in the secondary pollutants can not be effectively recovered, so that resource waste is caused. The simple blending and recycling is that a small amount of waste such as tar slag is recycled into coking coal, and the recycling can be partially realized, but the blending proportion is extremely low (generally not more than 1 percent), and a large amount of waste cannot be effectively consumed. Excessive blending can seriously affect coke strength, thermal reactivity and ingredient stability, and even interfere with proper coke oven operation. The treatment is carried out by outsourcing of the unit with hazardous waste treatment qualification, and the treatment cost is high although meeting the requirement of regulations, so that the economic burden of enterprises is increased, and the risk of environmental leakage still exists in the transfer process. The prior art can not realize the integration of recycling and harmless treatment in the real sense, a large amount of coking waste is still treated in a temporary storage or landfill mode, land resources are occupied, and long-term environment and safety are hidden. Therefore, developing a comprehensive treatment method capable of cooperatively treating various coking wastes in a large scale, efficiently and cleanly and converting the coking wastes into products with economic value has become an urgent need for sustainable development of the industry. Disclosure of Invention The invention provides a comprehensive treatment method of coking waste, which aims to realize efficient cooperative treatment of various wastes such as tar residues, acid tar, biochemical sludge, waste activated carbon, waste desulfurizing agents and the like generated in the coking production process through an integrated treatment system, ensure thorough harmless treatment of the wastes, eliminate potential risks to the environment and human health, realize recycling to the greatest extent, reduce the discharge of the wastes and improve the overall production efficiency and sustainability by recycling and reutilizing valuable components. In order to achieve the technical purpose, the invention aims to provide a comprehensive treatment method of coking waste, which comprises the following steps: s1, analyzing physical characteristics and chemical components of each component in the coking waste, putting the coking waste into a mixing tank, introducing high-pressure steam to mix and stir, and preparing waste slurry with the water content of 30% -40%; S2, carrying out catalytic slurrying