一、柴油机消耗尿素的机理说明： 1、柴油机采用SCR技术满足国六排放控制要求，尿素是净化尾气中NOx污染物必不可少的反应剂； 2、尿素耗量的多少主要取决于尾气中的NOx总量（排气流量、NOx浓度）； 3、NOx是柴油机尾气的主要污染物，其生成量受缸内氧浓度、燃烧温度的影响。 4、选择性催化还原SCR（Selected CatalysticReduction）技术原理： 选择性催化还原NOx，该技术将浓度为32.5%的尿素水溶液喷入发动机的排气中，尿素水解生成NH3 与NOx在SCR催化器内反应生成N2和H2O。 1 尿素水解反应：NH2CONH2+ H2O -> 2 NH3+ CO2 2 NOx在催化器中的还原反应 NO + NO2+ 2NH3-> 2N2+ 3H2 4NO + O2+ 4NH3-> 4N2+ 6H2O 2NO2+ O2+ 4NH3-> 3N2+ 6H2O 三、高效柴油发动机燃油尿素综合使用成本明显降低 对于采用SCR技术路线的柴油机，油耗与尿素耗是一对矛盾体，油耗降低会导致尿素耗升高，两者共 同构成了柴油机的日常液耗。国六高效柴油发动机并非单一指标的提升，而是通过对油耗、尿素耗的耦合 优化降 ...

Group 1 - The overall fertilizer market is experiencing a "first decline, then rise" trend in Q1 2025, with initial supply-demand mismatches leading to continued low prices for coal chemical products, including urea and melamine [1] - In March, driven by spring farming demand and increased export expectations, urea prices rebounded quickly, positively impacting downstream product prices [1] - The company's overall gross margin decreased by 4 percentage points year-on-year but increased by nearly 3 percentage points quarter-on-quarter to 14%, indicating a rising trend [1] Group 2 - The company's revenue for Q1 reached 5.846 billion yuan, representing a year-on-year growth of 1.7% and a quarter-on-quarter growth of 2.4% [1] - Net profit attributable to shareholders was 197.5 million yuan, with basic earnings per share at 16.3 cents [1] - The company has strengthened cost control, with the proportion of three expenses decreasing by nearly 1 percentage point year-on-year, particularly financial expenses, which fell by 9% [1] Group 3 - Due to the decline in raw coal prices, the support for urea prices weakened, leading to a larger price drop for urea compared to cost reductions, resulting in a 23% year-on-year decline in overall gross margin [2] - However, with improvements in the fertilizer supply-demand landscape, product prices are gradually recovering, leading to a 26% quarter-on-quarter increase in gross margin [2] - The company's net profit, excluding non-recurring items, saw a significant quarter-on-quarter growth of 89%, indicating a stable upward trend in operations [2]