Core Insights - The quality inspection of automotive urea products in Suzhou for 2025 revealed a 0% non-compliance rate, indicating that all tested samples met the required standards [3][4]. Group 1: Inspection Overview - The Suzhou Market Supervision Administration commissioned the Suzhou Product Quality Inspection Institute to conduct a quality supervision sampling of automotive urea products [3]. - A total of 20 batches were planned for inspection, including 2 batches from manufacturers and 18 batches from the circulation sector [3]. Group 2: Product Details - The inspection covered various brands and types of automotive urea, including products from companies such as Suzhou Yiwen Oil Products Co., Ltd. and Jiangsu Kelasu Automotive Environmental Technology Co., Ltd. [4]. - All inspected products, including those sold in convenience stores and gas stations, were found to be compliant with quality standards [4][5].

要说柴油机和汽油车最大的区别，那就是燃烧方式，汽油机是预混合的火焰传播燃烧，阶段包括进 气→压缩（油气混合物）→点火燃烧（定容燃烧）→排气；柴油机主要是扩散燃烧，进气（纯空气）→ 压缩（纯空气）→喷油自燃（定压燃烧）→排气。 柴油机与汽油机最根本的区别在于点火方式，柴油机采用压燃式（CI Engine，Compress Ignition Engine）点火，而汽油机则依赖火花塞点燃（SI Engine，Spark Ignition Engine）。 柴油机工作时，只吸入空气并将其压缩，随后喷油器将柴油以雾状形式喷入高温高压的空气中，柴 油在压缩空气产生的高温下自行燃烧。这种点火方式决定柴油机不需要复杂的点火系统，如火花塞和高 压线圈。汽油机则不同，它吸入的是空气与燃油的混合物，在压缩冲程接近尾声时，火花塞产生电火花 点燃混合气。 由于柴油机依靠压燃式燃烧，因此燃油喷射压力极高，高的达到2500bar，而汽油机目前量产的第 五代EA888搭载的500bar喷油压力已属"天花板"，对比柴油机的供油压力是"小巫见大巫"。同时，柴油 机由于没有点火系统，省去火花塞等部件的定期更换，总体维护成本较低。但柴油机的喷油嘴和 ...

Core Points - The article discusses the results of the second batch of product quality supervision and inspection conducted by the Huzhou Market Supervision Administration in Zhejiang Province, aimed at ensuring public health and safety [3] Group 1: Inspection Results - The inspection revealed that several products did not meet quality standards, including the "Shu Ting Instant Absorbent Series Night Use Sanitary Napkin" and "Safety Helmet" [4][5] - Specific products that failed the inspection include: - "Shu Ting Instant Absorbent Series Night Use Sanitary Napkin" (310mm, 20 pieces) from Changzhou Yun Yun Sanitary Products Factory [4] - "Safety Helmet" (model 529) from Jieyang Hongcheng Hardware Electronics Co., Ltd. [4] - Products that passed the inspection include: - "Hot Rolled Round Steel Bar" (HPB300, 14mm) from Shaoxing Shangyu Huaxing Metal Profile Co., Ltd. [4] - "Autoclaved Aerated Concrete Block" from Huzhou Green New Material Co., Ltd. [4] Group 2: Compliance and Testing - The testing was conducted by Zhejiang Fangyuan Testing Group Co., Ltd., which is responsible for ensuring compliance with safety and quality standards [4][5] - The results indicate a mix of compliance, with some products meeting the required standards while others did not, highlighting the importance of ongoing quality control in the industry [4][5]

Group 1: Mechanism of Urea Consumption in Diesel Engines - Diesel engines utilize SCR technology to meet National VI emission control requirements, with urea being an essential reagent for purifying NOx pollutants in exhaust gases [1] - The amount of urea consumed primarily depends on the total NOx in the exhaust (exhaust flow rate, NOx concentration) [1] - NOx is the main pollutant in diesel engine exhaust, and its generation is influenced by the oxygen concentration in the cylinder and combustion temperature [1] - The SCR technology works by injecting a 32.5% urea solution into the exhaust, where it hydrolyzes to form NH3, which then reacts with NOx in the SCR catalyst to produce N2 and H2O [1] Group 2: Increase in Urea Consumption for High-Efficiency Diesel Engines - Compared to engines using EGR technology, high-efficiency SCR engines have increased fresh intake air and higher oxygen concentration in the cylinder, leading to more complete combustion and reduced fuel consumption [4] - Higher combustion temperatures (above 1600°C) significantly increase NOx generation, necessitating more urea consumption to meet National VI emission regulations [4] Group 3: Reduction in Comprehensive Fuel and Urea Costs - For diesel engines using SCR technology, fuel consumption and urea consumption are interrelated; reduced fuel consumption leads to increased urea consumption [5] - The overall liquid consumption cost of high-efficiency diesel engines decreases despite the increase in urea consumption, as the cost savings from reduced fuel consumption outweigh the increased urea costs [5] - High-efficiency diesel engines show a fuel consumption reduction of 4% to 7% and a comprehensive fuel-urea cost reduction of 3% to 5% compared to EGR technology engines [5] Group 4: Factors Affecting Urea Consumption - Urea consumption is not a stable value and is influenced by driving habits and operating conditions [6] - High urea consumption can result from aggressive driving, heavy loads, poor-quality urea, or high-sulfur diesel [6] - Low or no urea consumption may occur due to SCR system failures or low-load/idle conditions [7] Group 5: Normal Urea-Fuel Ratio for National VI Diesel Engines - The urea-fuel ratio for EGR models ranges from 4% to 8%, while for non-EGR models, it ranges from 6% to 12% [8] Group 6: Recommendations for Reducing Urea Consumption - Ensure proper vehicle maintenance and use of compliant diesel and urea solutions [9] - Develop good driving habits, such as minimizing rapid acceleration and avoiding prolonged idling [10][11]

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]