Collection of questions on product recycling

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1. Net coke oven gas is composed of　　　　,　　　　,　　　　　,　　　　　,　　　　,　　　　　,　　　　　. The calorific value of the reburning coal gas is　　　　, and its density is　　　　　　. 　　　　2. Steps for cooling raw gas:　　　　　　　　　,　　　　　　　　　　　　　. 3. The quality of tar is controlled by　　　　　,　　　　　,　　　　　in the tar. Tar can be divided into low-temperature tar and . 4. Function of the blower: When selecting the location for the blower, the following factors should generally be taken into consideration: ,　　　　　　　　　　　　　　　　　　　　　　. 　　　The total pressure head of the blower in a general recycling workshop is kPa. The characteristic adjustments for the blower include: , and . 5. The methods for recovering NH3 gas include the saturator method for producing ammonium sulfate, and three other methods. The saturator method can be further divided into , and . 6. The methods for recovering aromatic hydrocarbons from gas include: , and , among others. Among them, the one commonly used in coking plants is . 7. Sulfides in gas can be divided into two categories based on their chemical state: one category is ； The other category is . The sulfur contained in H2S within the gas accounts for approximately of the total sulfur in the gas. The methods for removing hydrogen sulfide from gas are divided into dry desulfurization and wet desulfurization; wet desulfurization can be further divided into alkaline treatment and oxidation methods, while oxidation methods can be further divided into various specific techniques. II. True or False Questions 1. Gas systems and equipment must not allow gas to leak out or air to be drawn in. ( )2. The ammonia content in the gas after the saturator shall not exceed 0.03 g/m3. （ ）3. The specific gravity of acid tar is higher than that of regenerated acid. ( )4. The operating requirement for mechanical clarifiers is that the level of the tar liquid must not be higher than 1500 mm before shift handover. ( )5. Final distillation of light naphtha is carried out to produce products such as pure benzene, pure toluene, industrial xylene, and light solvent oil. （ ）6. Before working on equipment and pipelines, it is sufficient to clean them with steam before proceeding with the work. （ ）7. Steam distillation is commonly used for the distillation of heat-sensitive substances, or for the separation of substances with high boiling points from impurities at atmospheric pressure. （ ）8. Full reflux operation is commonly used in cases of abnormal operation of distillation columns. （ ）9. The entire crystallization process can be divided into two stages: the formation of crystal nuclei and the growth of crystals. （ ）10. The stronger the aeration and stirring in the aeration tank, the better. ( )