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CN-121990779-A - Garbage incineration power generation flue gas desulfurization and fly ash cooperative treatment method and baking-free brick block

CN121990779ACN 121990779 ACN121990779 ACN 121990779ACN-121990779-A

Abstract

The application provides a flue gas desulfurization and fly ash cooperative treatment method for waste incineration power generation, which comprises the following steps of collecting fly ash in flue gas and preprocessing the fly ash to remove impurities and adjust water content, step 2, carrying out sodium-based wet desulfurization on the flue gas to obtain desulfurization liquid, step3, carrying out distributed chelation and solidification on the preprocessed fly ash, the desulfurization liquid, a biological chelant and a gel auxiliary agent to obtain a fly ash solidified material, step4, crushing the fly ash solidified material and then coating the fly ash solidified material to obtain coating powder so as to improve the compression strength and impermeability of the fly ash solidified material, and step 5, carrying out fine grinding on the coating powder, and then mixing and compression molding the coating powder with other raw materials as aggregate to obtain baking-free brick blocks. The compressive strength and the impermeability of the chelate cured product serving as the road brick material are improved by coating the chelate cured product. The application also provides a baking-free brick with strong impermeability and compression resistance, which is prepared by the garbage incineration power generation flue gas desulfurization and fly ash cooperative treatment method.

Inventors

  • ZHANG CHENBIN
  • Jing Zenghang
  • SUN HUIYANG

Assignees

  • 宁夏中科国通新能源有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (10)

  1. 1. A method for desulfurizing flue gas and cooperatively treating fly ash generated by garbage incineration is characterized by comprising the following steps: Step 1, collecting fly ash in flue gas and preprocessing the fly ash to remove impurities and adjust the water content; step 2, flue gas sodium-based wet desulfurization to obtain desulfurization liquid; Step 3, carrying out distributed chelation and solidification on the pretreated fly ash, desulfurizing liquid, biological chelating agent and gel auxiliary agent to obtain a fly ash solidified substance; Step 4, crushing and coating the fly ash solidified material to obtain coated powder so as to improve the compressive strength and the impermeability of the fly ash solidified material; And 5, finely grinding the coated powder, and then mixing the powder with other raw materials serving as aggregate, and pressing and forming to obtain the baking-free brick.
  2. 2. The method for flue gas desulfurization and fly ash co-treatment in waste incineration power generation according to claim 1, wherein the bio-chelating agent is humic acid.
  3. 3. The method for flue gas desulfurization and fly ash co-treatment for waste incineration power generation according to claim 1, wherein the gel auxiliary agent is sodium silicate solution.
  4. 4. The method for flue gas desulfurization and fly ash co-treatment in waste incineration power generation according to claim 1, wherein the fly ash is distributed, chelated and solidified, and comprises the following steps: step 31, stirring and mixing fly ash and desulfurization liquid, wherein the mass ratio of liquid to solid is 2:1; Step 32, uniformly scattering humic acid powder into the product of the previous step, and continuously stirring to obtain a chelating suspension; step 33, spraying a sodium silicate solution into the chelating suspension, and continuously stirring to obtain chelating gel; and 34, drying and curing the chelating gel in the shade to obtain a fly ash cured product.
  5. 5. The method for flue gas desulfurization and fly ash co-treatment in waste incineration power generation according to claim 1, wherein the coating of the solidified fly ash comprises the following steps: step 41, crushing the fly ash solidified material to a particle size of 3-5 mm, and drying to obtain solidified material particles; Step 42, mixing cement, slag micropowder, fiber, coupling agent and water according to a preset proportion, and stirring to form uniform slurry without caking; step 43, uniformly spraying the slurry on the surfaces of the solidified material particles to enable the solidified material particles to be completely covered by the coating layer; And 44, pre-curing the coated particles for a preset time to enable the coating layer to be primarily hydrated, and then naturally drying in the shade to be solidified to obtain the coating powder.
  6. 6. The method for flue gas desulfurization and fly ash co-treatment in waste incineration power generation according to claim 5, wherein the mass ratio of cement, slag micropowder, fiber and coupling agent is 20:10:0.1:0.5.
  7. 7. The method for flue gas desulfurization and fly ash co-treatment in waste incineration power generation according to claim 5, wherein the fibers are polypropylene fibers with a length of not less than 6mm.
  8. 8. The method for flue gas desulfurization and fly ash co-treatment for waste incineration power generation according to claim 5, wherein the coupling agent is a silane coupling agent.
  9. 9. The baking-free brick prepared by the method of claim 1, wherein the baking-free brick comprises cladding powder, cement and sand.
  10. 10. The baking-free brick of claim 9, wherein the mass ratio of the coating powder, the cement and the sand is (40% -50%) (20% -25%) (15% -30%).

Description

Garbage incineration power generation flue gas desulfurization and fly ash cooperative treatment method and baking-free brick block Technical Field The application relates to the technical field of waste incineration power generation, in particular to a waste incineration power generation flue gas desulfurization and fly ash cooperative treatment method and baking-free brick blocks. Background The flue gas generated by garbage power generation contains a large amount of sulfides and fly ash. For sulfides, the existing treatment is desulfurization. In the desulfurization process, part of fly ash with smaller particles can enter into the desulfurization liquid. The desulfurization liquid is generally used for preparing desulfurization gypsum, so that the heavy metal content of the desulfurization gypsum is easily exceeded. In the conventional treatment method of fly ash, the fly ash is collected and then is sequestered and landfilled, or the sequestered solidified material is made into roadbed materials, bricks and the like. For example, the patent number 202310918648.6 is a chelating agent, a preparation method thereof and a light brick, wherein the light brick is prepared from the following raw materials, by weight, 50-130 parts of fly ash, 7-9 parts of cement and 10-16 parts of chelating solution, and the chelating solution comprises the chelating agent and water. The fly ash landfill requires more space and has a greater concentration. The fly ash contains a large amount of heavy metal elements, and is eroded by rainwater for a long time, so that heavy metals are easy to leach out of a condensate, and the heavy metal content of the soil exceeds the standard. At the same time, the cost of fly ash sequestration is also high, and the cost of landfills is also high. When the solidified product of the fly ash chelation is used as a roadbed material, the solidified product has poor compression resistance, needs to be mixed with natural aggregate for use, and can only be used for low traffic load road sections. Meanwhile, fly ash belongs to dangerous waste, and when the fly ash is used as a roadbed material, the fly ash is improperly treated and heavy metal exceeding standard can be caused. When the solidified product of the fly ash chelation is used as a wall brick, the acceptance is low when the solidified product is used on a residential wall due to the high heavy metal content. Most enterprises adopt the form of railing as an outer wall, and the consumption of wall bricks is small. When the cured product of the fly ash chelate is used as a road brick, vehicles often pass, the chelate is less in pressure resistance and is easy to break, the chelate state of the cured product is difficult to maintain along with leaching of rainwater, and heavy metals in the cured product gradually leach out and diffuse into surrounding soil within 2-3 years. Although some heavy metals can be absorbed by means of plants, etc., the heavy metals cannot be completely absorbed due to the high content of the heavy metals. The residual heavy metals can gradually flow into the underground water or the natural water system to influence ecology. Therefore, the road brick prepared from the fly ash has high use risk. In conclusion, the existing fly ash products are very limited in application scene due to the problems of compression resistance and heavy metal leaching, and the utilization rate of resources in China is less than 10%. Disclosure of Invention In view of the above, the application provides a method for flue gas desulfurization and fly ash synergistic treatment in waste incineration power generation, wherein desulfurization liquid after flue gas desulfurization and fly ash are chelated to prepare baking-free bricks with strong impermeability and compression resistance, and heavy metals are not easily dissolved out, so that the problems of treatment of the desulfurization liquid after flue gas desulfurization and treatment of the fly ash chelated solidified matters are solved, and the recycling utilization rate of fly ash products is improved. The application also provides a baking-free brick with strong impermeability and compression resistance, which is prepared by the garbage incineration power generation flue gas desulfurization and fly ash cooperative treatment method. The method for desulfurizing the flue gas and cooperatively treating the fly ash in the power generation by the garbage incineration comprises the following steps: Step 1, collecting fly ash in flue gas and preprocessing the fly ash to remove impurities and adjust the water content; step 2, flue gas sodium-based wet desulfurization to obtain desulfurization liquid; Step 3, carrying out distributed chelation and solidification on the pretreated fly ash, desulfurizing liquid, biological chelating agent and gel auxiliary agent to obtain a fly ash solidified substance; Step 4, crushing the fly ash solidified material, and then coating to obtain coating powder, s