VOCs Waste Gas Treatment In Coal Coking Industry

VOCs Waste Gas Treatment In Coal Coking Industry

Discover advanced solutions for effective VOCs waste gas treatment in coal coking processes. Our RTO (Regenerative Thermal Oxidizer) systems provide superior emission control, ensuring compliance with environmental standards and enhancing operational efficiency. Learn how our RTO technology can help your facility achieve sustainable and reliable VOCs management.

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Sources of coking VOCs

  • Chemical production section of coal gas purification: cold drum, desulfurization, ammonium sulfate, crude benzene, salt extraction
  • Phenol cyanide wastewater: oil separator, regulating tank, flotation tank
  • Tank area: benzene tank, tar tank, intermediate tank…
  • Methanol production from coal gas: synthesis section, fine desulfurization, tank area…
  • Coal tar deep processing: waste gas from processing

Schematic diagram of the production and process flow of coal gas purification and chemical product recovery and waste gas discharge nodes

Analysis of coking waste gas characteristics

  • VOCS waste gas components are complex and diverse, up to hundreds of types
  • Contains tar, naphthalene and other adhesive and easy-to-polymerize and easy-to-crystallize waste gas
  • Emission characteristics of each section are the same
  • Strict fire and explosion protection requirementsAdopt high temperature combustion and circulation purification process
Exhaust gas source Region Component Characteristics
Chemical production area Cold drum section Tar storage tank, ammonia tank, tar intermediate tank,
Tar ship, tar residue outlet, underground water seal tank, etc.		 Tar, naphthalene, phenol, benzene series, ammonia, hydrogen sulfide, hydrogen cyanide, benzopyridine, etc. Flammable and explosive, easy to crystallize, high viscosity, toxic, small air volume, high concentration, low oxygen (mostly)
Crude benzene section Crude benzene tank, oil washing tank, rich oil tank, lean oil tank, etc. Benzene series, naphthalene, heavy benzene, etc.
Tank area and loading Tar tank, benzene tank, ammonia tank, etc. Tar, benzene series, ammonia, etc.
Desulfurization/ammonium sulfate section Regeneration tower, sulfur dissolving kettle, ammonia tank, accident tank
Mother liquor tank, crystallization tank, full flow tank, etc.		 Ammonia, hydrogen sulfide, a small amount of tar, naphthalene and other VOCs gases Toxic, corrosive, large air volume, low concentration, high oxygen (mostly)
Two salt sections Reaction kettle, etc. Salt particles, a small amount of VOCs gases
Hazardous waste room Hazardous waste storage room, laboratory, etc. A small amount of VOCS
Sewage area Regulating tank, oil separator, flotation tank, etc. Ammonia, a small amount of VOCs gases

Process package route

Classification and treatment of high and low oxygen waste gas

 

  • Low-oxygen and high-concentration waste gas enters the negative pressure system for circulation and purification
  • High-oxygen and low-concentration waste gas enters the rotary RTO for independent incineration treatment

Treatment technology of low oxygen waste gas from chemical production

Storage tanks, tanks and points with good airtightness and low oxygen content are purified by the negative pressure circulation system of coal gas

Technical advantages

  • Classification management
  • Single-point single control for branches, and pressure balance for main control
  • VOCS zero emission
  • Low investment cost

Collection and control of low-oxygen waste gas from chemical products

Nitrogen sealing control + recovery to negative pressure gas system – deep circulation purification, zero emission

Nitrogen sealing control

Recovery to negative pressure gas system

Mixed LEL calculation + dilution ratio/air volume calculation

  • The exhaust gas concentration entering RTO is less than 25%LEL, HJ-1093 Thermal Regenerative Combustion Method Industrial Organic Waste Gas Treatment Engineering Technical Specifications;
  • Original air volume 5549Nm³/h, 25%LEL safety air distribution 81808Nm³/h, 1.8g/Nm³ self-operation 639,000 Nm³/h;

Relationship between mixed gas concentration and explosion range

    High concentration exhaust gas wet blending

    • Mixing is carried out in a water/liquid spray environment;
    • Ignition sources are blocked to ensure safe and reliable mixing;

    • Mixing is fast and uniform, without hidden dangers of dead corners;
    • Multi-stage mixing, the structure is not easy to produce static electricity accumulation;
    • Low-oxygen flue gas can be mixed to ensure inherent safety;