1. Application in the chemical industry: small synthetic ammonia upstream and downstream gas waste heat recovery; (2) middle synthetic ammonia upstream and downstream gas waste heat recovery; synthetic ammonia blowing gas combustion waste heat recovery; synthetic ammonia primary furnace flue gas waste heat recovery; 300,000 tons/ The waste heat recovery of the second-stage reformer for ammonia synthesis. 2. Application in the sulfuric acid industry: waste heat recovery in the boiling layer of the boiling roaster for sulfuric acid production; a plant with an annual output of 100,000 tons of sulfuric acid can recover 55,000 tons of steam; recovery of waste heat from the boiling SO2 high-temperature furnace gas ; A plant with an annual output of 100,000 tons of sulfuric acid can recover 105,000 tons of steam, and can generate electricity worth about 6 million yuan; the application in hydrochloric acid and nitric acid furnaces: basically the same; 3. Application in petrochemical industry; 4. In building materials industry Application in the metallurgical industry; 5. Application in the metallurgical industry.