1. Wet electric dephosphorization and dust removal

Using the company's independently developed wet electric dephosphorization dust collector, the P ₄ and particulate matter in the yellow phosphorus tail gas are electrostatically adsorbed

and then removed through spray settling, reducing the total phosphorus concentration to below 10 ppm.

2. Three stage Venturi high-efficiency washing tower treatment

The first stage uses chemical strong oxidation to further remove total phosphorus, the second stage uses chemical alkali washing to remove acidic gases such as hydrogen sulfide, and the

third stage uses clean water washing to remove phosphorus and particulate matter.

3. The total phosphorus concentration can be reduced to below 1ppm, total sulfur to below 20ppm, and particulate matter to below 1ppm.

1. Technological process:

2. Theoretical power generation calculation

The volumetric calorific value of pure CO under standard conditions is 11.5 MJ/m ³ (approximately 3.19 kWh/m ³), and the concentration of CO in industrial exhaust is usually 80% to 92%.

The actual calorific value is approximately 9.2 to 10.6 MJ/m ³ (2.56 to 2.94 kWh/m ³). The power generation efficiency of a steam turbine is generally 25% to 35%.

Theoretical power generation=calorific value x efficiency

Pure CO theoretical power generation=3.19kWh/m ³ × 30% ≈ 0.96kWh/m ³

Industrial exhaust gas (85% CO) theoretical power generation=2.8 kWh/m ³ × 30% ≈ 0.84 kWh/m ³

3. Actual case reference

Guizhou Wengfu Chemical has a set of 12MW steam turbines and 2 sets of 25 ton boilers. The actual operating situation is that 1.45m3 of phosphorus furnace tail gas can generate 1kWh

of electricity, or 1.00m3 of phosphorus furnace tail gas can generate 0.69kWh of electricity. The actual thermal conversion efficiency is 0.69 × 860/2800=21.2%.

4. Suggestions for power generation configuration of phosphorus furnace tail gas turbine (based on an annual output of 12500 tons of yellow phosphorus)

(1) Phosphorus furnace tail gas generated per hour: 1.736t × 3000m3/t=5208m3/h

(2) The exhaust gas from the self use phosphorus furnace accounts for 15% per hour, totaling 5208 × 15%=781m3/h

(3) Exhaust gas available for power generation: 5208-781=4427m3/h

(4) Steam turbine unit configuration: 3.0MW generator set, equipped with 2 × 15t steam boilers.

(5) Exhaust gas consumption: 3000/0.69=4347 m3/h

(6) Hourly power generation: 1 × 3000kWh=3000kWh

(7) The total investment for key equipment (steam turbine unit and boiler) is approximately 25 million yuan.

1. Technological process:

2. Theoretical power generation calculation

The pure CO calorific value is 12.636 MJ/kg (approximately 3.51 kWh/kg), the gas density is 1.25 kg/m ³, and the volumetric calorific value is approximately 10.5-12 MJ/m ³

(2.92-3.33 kWh/m ³). The CO concentration in industrial exhaust gas is usually 80% -92%, and the actual calorific value is approximately 8.4-11 MJ/m ³ (2.33-3.06 kWh/m ³). The power

generation efficiency of internal combustion engines is generally between 35% and 45%, with a median value of 40% for calculation.

Theoretical power generation=calorific value x efficiency

Pure CO power generation=3.13kWh/m ³ × 40% ≈ 1.25kWh/m ³

Industrial exhaust gas (85% CO) power generation=2.7kWh/m ³ × 40% ≈ 1.08kWh/m ³

3. Actual case reference

Tested data from a project in Hubei: A 6MW unit processes 2400m ³ of exhaust gas per hour, generating 2600-2800kWh of electricity, equivalent to 1.08-1.17kWh/m ³. The exhaust power

generation and efficiency are basically consistent with the theoretical values.

4. Suggestions for power generation configuration of phosphorus furnace exhaust gas and internal combustion engine (based on an annual output of 12500 tons of yellow phosphorus)

(1) Phosphorus furnace tail gas generated per hour: 1.736t × 3000m3/t=5208m3/h

(2) The exhaust gas from the self use phosphorus furnace accounts for 20% per hour, totaling 5208 × 20%=1042m3/h

(3) Exhaust gas available for power generation: 5208-1042=4166m3/h

(4) Internal combustion unit configuration: 4 × 1.2MW

(5) Exhaust gas consumption: 4 × 1000m3=4000 m3/h

(6) Hourly power generation: 4 × 1100kWh=4400kWh

(7) Total investment: approximately 15 million yuan.

1. Application of corrosion-resistant materials

The boiler and flue are made of materials such as stainless steel and alloy steel to resist corrosion from high temperatures (above 950 ℃) and acidic gases (such as P ₂ O ₅, H ₂ S). An

insulation layer is added to the tail of the flue to prevent acidic corrosion caused by low-temperature condensation.

2. Multiple security controls

Integrated flame monitoring, pressure control, leak detection and other protective devices to avoid explosion risks. Real time monitoring of exhaust gas components (such as CO and pH

concentration), dynamically adjusting combustion parameters through PLC and SCADA systems to ensure stable operation.

The high-efficiency purification process of phosphorus furnace tail gas is simple, with strong sulfur resistance and low operating costs. Combining AI intelligent control to optimize

combustion, promoting modular design, and advancing green upgrading under the "dual carbon" goal.

The use of phosphorus furnace exhaust gas for internal combustion engine power generation requires deep purification as a prerequisite, adopting split inlet dual boost technology,

matched with intelligent control system, to utilize hydrogen containing exhaust gas for power generation, eliminate backfire and flash explosion problems, and completely solve the

safety and reliability issues of using mining furnace exhaust gas for internal combustion engine power generation. The annual operating time exceeds 8000 hours, achieving exhaust

gas resource utilization and high-value energy utilization. Practice has proven that its economic benefits are better than gas turbines, and it is the development direction of tail gas

power generation in yellow phosphorus enterprises.