1. Energy Efficiency and Safety Transformation in the Petrochemical Industry

The petrochemical industry is a typical high-risk, high-complexity industrial sector, which has stringent requirements for equipment safety and reliability. From crude oil entering the refinery to its transformation into plastics, fuels, or chemicals, heat transfer is critical. In this domain, HT-Bloc represents not merely a replacement for legacy equipment but a fundamental process optimization solution.

1.1 Refinery Units: Breakthroughs in Crude Preheat Trains & Distillation (CDU/VDU)

The Crude Distillation Unit (CDU) is the primary processing stage and the facility’s largest energy consumer. Before entering the atmospheric distillation tower, crude oil needs to go through a complex preheat train, where its temperature is raised to 280°C–300°C by recovering heat from side draws and bottom residues. It is then further heated to approximately 360°C in the furnace before entering the tower. The fuel consumption of the furnace directly determines the refinery’s processing costs and carbon emission levels.

Critical Challenges: Fouling & Thermal Efficiency Bottlenecks

• Asphaltenes are prone to fouling: Crude oil is a complex mixture containing asphaltenes, inorganic salts, wax, and suspended solids. In traditional shell-and-tube heat exchangers, low flow velocities and baffle “dead zones” cause asphaltenes to precipitate and polymerize due to temperature gradients, forming hard coke layers.
• Thermal Resistance Surge: The fouling layer has low thermal conductivity, causing performance to degrade exponentially. Operators must increase furnace load to maintain tower bottom temperatures, leading to soaring fuel consumption.
• Maintenance costs increased: Refineries typically require cleaning cycles every few months, often necessitating shutdowns for tube bundle extraction.

HT-Bloc Solutions: HT-Bloc demonstrates exceptional adaptability in crude oil cooling and crude/residue heat exchange applications.

• High Shear Force Inhibits Fouling: The corrugated plates of HT-Bloc produced by Shanghai Heat Transfer Equipment Co., Ltd. (SHPHE) generate high-intensity turbulence and extremely high wall shear stress, which can effectively strip off initially deposited asphaltene precursors and make it difficult for fouling to adhere. Field data shows that under the same operating conditions, the fouling rate of HT-Bloc is only 10%–20% that of shell-and-tube heat exchangers, significantly extending cleaning cycle.
• Ultimate Heat Recovery: With a fully counter-current design, HT-Bloc achieves a terminal temperature difference (approach temperature) as low as 3°C–5°C.Space & Layout Optimization: A single HT-Bloc unit can replace 4–8 shell-and-tube heat exchangers in series，occupying only 10%–20% of the footprint and reducing weight by more than 80%. This frees up valuable space for revamp projects and capacity upgrades.
  • Economic Impact: For a 10-million-ton refinery, every 1°C increase in crude furnace inlet temperature saves millions in fuel costs and reduces thousands of tons of CO₂ emissions annually.

1.2 Gas Treatment: Corrosion Control in Amine Sweetening Systems

In gas plants and refineries, using amine solutions (e.g., MDEA) to absorb Hydrogen Sulfide (H₂S) and Carbon Dioxide (CO₂) is the standard desulfurization and decarbonization process. The lean/rich amine exchanger is the core energy-saving unit.

Critical Challenges: Stress Corrosion & Zero Tolerance for Leakage

• HISC & Stress Corrosion Cracking (SCC): H₂S reduces to atomic hydrogen on metal surfaces, causing Hydrogen-Induced Stress Cracking (HISC). Rich amine with high acid gas loading (>90°C) is highly corrosive to carbon steel, particularly in the Weld Heat Affected Zone (HAZ). Traditional units often require expensive Post-Weld Heat Treatment (PWHT) or alloy overlay.
• Lethal Service Risks: H₂S is highly toxic. Rubber gaskets in traditional plate exchangers are prone to aging and swelling in high-temperature amine, posing severe safety hazards.

The HT-Bloc Advantage: Balancing Economics & Safety

• All-Welded Safety Barrier: The fully welded plate pack eliminates the risk of toxic media leakage caused by gasket failure.
• Material Economics:Due to the extremely thin plates (0.8–1.0 mm), the material cost of manufacturing HT‑Bloc using stainless steel (316L) is much lower than that of shell‑and‑tube heat exchangers with thick‑walled tubes.This makes it economically feasible to adopt corrosion‑resistant alloys throughout the amine system, fundamentally solving the ASCC problem.
• Energy Efficiency: The energy consumption of amine regeneration mainly depends on the temperature of the rich amine entering the regenerator.With high efficiency, HT-Bloc achieves a heat recovery rate of over 90%, which greatly increases the rich amine temperature, significantly reduces steam consumption in the regenerator reboiler, and optimizes the thermal balance of the entire desulfurization unit.

2. Hygiene and Thermal Sensitivity Control in Biodiesel Production

In palm oil-based biodiesel production (Pre-esterification, Transesterification, Distillation, Methanol Recovery), heat exchanger performance directly impacts product purity, safety, and energy consumption.

2.1 Process Pain Points

• Thermal Sensitivity (Isomerization): Palm oil (containing high free fatty acids) undergoes pre-esterification (60–80°C), transesterification (60–65°C), and distillation (200–300°C).Excessive residence time at high temperatures or uneven heating will cause fatty acid isomerization and thermal degradation of esters, producing harmful impurities such as aldehydes and acidic byproducts.This leads to an increase in acid value and a decrease in purity of biodiesel, affecting product quality and combustion performance, and may even result in failure to meet factory standards.Therefore, the heating and cooling processes of palm oil feedstock and reaction products must be rapid and uniform, with strict control over high-temperature residence time to avoid local overheating.

• High Energy Demand: The core processes of biodiesel production from palm oil all require a stable heat source.Recovering waste heat from high-temperature reaction products (60–80°C) and distillation tower overhead vapor (64.7°C and above) to preheat cold feedstock is critical.The waste heat recovery process is mainly accomplished by the economizer, and its heat recovery efficiency directly determines the plant’s energy cost.
• Difficult Cleaning: After long-term operation, gums in palm oil, soaps formed during the reaction, residual catalyst particles, and other substances tend to polymerize and deposit on the heat exchanger walls, forming fouling.This not only reduces heat transfer efficiency and increases energy consumption but also shortens the service life of the equipment.

2.2 HT-Bloc Hygienic & Energy-Saving Solutions

• Precise Temp Control & Quality Assurance: HT‑Bloc features an extremely low hold‑up volume. The residence time of palm oil feedstock, reaction mixture, and distillation material in the high‑temperature zone of the equipment can be measured in seconds.The corrugated plate design by Shanghai Heat Transfer Equipment Co., Ltd. (SHPHE) creates uniform turbulence, ensuring even heating and controlling temperature fluctuations within ±1℃.This effectively inhibits fatty acid isomerization and thermal degradation of esters, reduces the formation of harmful byproducts, and ensures that biodiesel indicators such as purity (methyl ester content ≥96%) and acid value meet requirements.

• High-Efficiency Heat Recovery:As an economizer, HT‑Bloc achieves a heat recovery efficiency of over 80%, significantly reducing steam and cooling water consumption with remarkable energy-saving benefits, meeting the requirements of green and low-carbon production.
• Accessible & Hygienic Design: The detachable frame of HT‑Bloc allows physical cleaning such as high-pressure water jetting on the plate pack, ensuring long-term stable heat transfer performance and extending service life.