What are the applications of outer coil stainless steel towers in the environmental protection indus

Source： Release date： 2026-02-05

Information summary：The outer coil stainless steel tower, with its advantages of corrosion resistance, high heat transfer efficiency, and compact structure, is widely used in the environmental protection industry, mainly concentrated in four major fields: waste gas treatment, wastewater treatment, solid waste/hazardous waste disposal, and resource recovery. The following are specific application scenarios and core ro

The outer coil stainless steel tower, with its advantages of corrosion resistance, high heat transfer efficiency, and compact structure, is widely used in the environmental protection industry, mainly concentrated in four major fields: waste gas treatment, wastewater treatment, solid waste/hazardous waste disposal, and resource recovery. The following are specific application scenarios and core roles:
1、 Waste gas treatment field (core application)
1. Absorption and treatment of acidic/alkaline waste gas
Application scenarios: Treatment of acidic and alkaline waste gases containing HCl, H ₂ SO ₄, NO ₓ, SO ₂, NH ∝, etc. generated in the chemical, pharmaceutical, electroplating, electronics, and metallurgical industries.
Core function: The tower body is made of stainless steel material, and the outer coil tube is connected to cooling water/hot water to control the reaction temperature inside the tower and improve the efficiency of acid-base absorption; At the same time, avoid high temperatures causing exhaust gas to escape or corrosion to intensify, and adapt to continuous exhaust gas treatment conditions.
2. Organic waste gas (VOCs) condensation recovery/pretreatment
Application scenarios: Treatment of VOCs waste gases (such as toluene, xylene, acetone, ethanol, etc.) in the painting, printing, chemical, and plastic processing industries.
Core function: The outer coil is connected to low-temperature refrigerants (such as ethylene glycol and chilled water) to cool and condense VOCs waste gas, converting gaseous organic matter into liquid for recovery; It can also be used as a pre cooling tower before VOCs incineration (RTO/RCO) to reduce the subsequent equipment load.
3. Cooling and purification of high-temperature exhaust gas
Application scenarios: Treatment of high-temperature (200-800 ℃) exhaust gases such as incinerator exhaust gas, boiler flue gas, and hazardous waste incineration exhaust gas.
Core function: The outer coil tube is connected to cooling water to achieve rapid cooling/cooling of high-temperature exhaust gas, avoiding damage to subsequent filter media, catalysts, or tower packing due to high temperature; At the same time, it can be coupled with spray washing to simultaneously remove dust and acidic pollutants, achieving the integration of "cooling+purification".
4. Removal of odorous gases
Application scenarios: Odorous exhaust gases (including H ₂ S, thiols, amines, etc.) from sewage treatment plants, garbage transfer stations, pharmaceutical factories, and livestock farms.
Core function: External control temperature ensures the temperature of biodegradation/chemical oxidation reactions inside the tower, combined with spray solution (alkali solution, oxidant, biological bacterial solution), efficiently removes odor components, stainless steel material is corrosion-resistant to odor media, and has a long service life.
2、 Wastewater treatment field
1. Evaporation and concentration of high salt wastewater
Application scenarios: Treatment of high salt wastewater (containing NaCl, Na ₂ SO ₄, heavy metal salts, etc.) in the chemical, pharmaceutical, electroplating, and photovoltaic industries.
Core function: The outer coil is heated by steam/thermal oil to evaporate and concentrate wastewater, reduce wastewater volume, and achieve salt crystallization separation; Stainless steel material is resistant to high salt and high temperature corrosion, suitable for MVR evaporation and multi effect evaporation processes.
2. Neutralization pretreatment of acidic/alkaline wastewater
Application scenario: Strong acid/alkali wastewater regulation in metallurgy, electroplating, and chemical industries.
Core function: To control the temperature of the external disk, ensure the smooth progress of neutralization reactions (acid and alkali, alkali and acid), and avoid sudden temperature increases caused by exothermic reactions; The tower can be filled with fillers to enhance mass transfer, improve neutralization efficiency, and stainless steel is resistant to acid and alkali media corrosion.
3. Wastewater deamination/denitrification
Application scenario: Treatment of high ammonia nitrogen wastewater in the fertilizer, pharmaceutical, and aquaculture industries.
Core function: Heating the outer coil increases the temperature of the wastewater, promotes the volatilization of ammonia nitrogen in the form of NH3, and cooperates with gas-liquid contact inside the tower to achieve blow off and ammonia removal; It can also be used as a nitrification/denitrification reaction tower, with temperature control to ensure microbial activity and treat total nitrogen pollutants.
3、 Solid waste/hazardous waste disposal field
1. Purification of hazardous waste incineration exhaust gas
Application scenario: Tail gas treatment after incineration of medical waste and industrial hazardous waste.
Core function: Cooling the high-temperature incineration tail gas with an outer coil, and synchronously removing dioxin precursors, acidic gases, and dust through spraying; Stainless steel material is resistant to strong corrosive media in incineration exhaust gas (such as HCl, SOx, heavy metal vapor), and is suitable for harsh working conditions in hazardous waste disposal.
2. Treatment of tail gas from sludge drying
Application scenario: Wet and odorous tail gas generated during the sludge drying process in sewage treatment plants.
Core function: The outer coil tube condenses and recovers the moisture in the exhaust gas, reduces the humidity of the exhaust gas, and removes odorous components to achieve standard emissions of dried exhaust gas and avoid secondary pollution.
4、 Resource recycling and utilization of environmental by-products
1. Recovery of useful components from exhaust gas
Application scenarios: Recovery of organic solvents, acidic gases (such as HCl, SO ₂), and ammonia from waste gases in the chemical industry.
Core function: External control temperature optimization absorption/condensation conditions, converting useful components in exhaust gas into liquid recovery (such as recovering hydrochloric acid, acetic acid, organic solvents), achieving dual benefits of "environmental governance+resource recovery".
2. Resource utilization of desulfurization by-products
Application scenario: Treatment of by-products after flue gas desulfurization (ammonia method, sodium method).
Core function: Heating/cooling of the outer coil, concentration and crystallization of desulfurization slurry (such as ammonium sulfate and sodium sulfite solutions), conversion of by-products into usable products (such as fertilizers and industrial salts), and avoidance of solid waste generation.

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