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Bid Farewell to Drawbacks of Traditional Water-soluble Fertilizer Granulation & Drying Potassium Humate Spray Drying Tower Ushers in a New Production Trend

Home > Blog > Application > Bid Farewell to Drawbacks of Traditional Water-soluble Fertilizer Granulation & Drying Potassium Humate Spray Drying Tower Ushers in a New Production Trend

Bid Farewell to Drawbacks of Traditional Water-soluble Fertilizer Granulation & Drying Potassium Humate Spray Drying Tower Ushers in a New Production Trend

Jun 15, 2026

Brief Analysis on the Feasibility of Superheated Steam Pneumatic Dryer

Most conventional spray granulation dryers for sodium humate adopt air as the drying medium. They suffer from prominent drawbacks including low drying rate and poor thermal efficiency. The sensible heat and latent heat contained in exhaust gas are difficult and costly to recover, involving high technical barriers. For this reason, exhaust gas is directly discharged by most such dryers currently. Industry statistics show that traditional drying processes generally have low thermal efficiency and longer drying cycles, which not only lowers productivity but also causes massive energy waste.

By contrast, the convection dryer using superheated steam as the drying medium can eliminate the above problems. It also features low net energy consumption, high heat and mass transfer efficiency, superior product quality and environmental friendliness. With high specific heat capacity and thermal conductivity, superheated steam delivers a higher heat transfer coefficient than hot air, accelerating the drying process and enabling cyclic heat reuse to improve overall thermal efficiency.

In addition, the steam atmosphere is oxygen-free, which prevents oxidative deterioration of materials. It is particularly applicable to heat-sensitive humic acid substances and keeps the product activity and color stable. The exhaust gas is treated via condensation and recovery, and the recycled water can be reused. The system achieves true zero emission with remarkable environmental benefits.

Quality Upgrade of Potassium Humate Drives Iteration of Drying Technology

(1) With the expanding application of potassium humate in agriculture, pharmaceuticals, environmental protection and other fields, the market has set higher standards for product purity, particle size uniformity and flowability. In agriculture, advanced compound fertilizers and water-soluble fertilizers impose increasingly strict requirements on the sphericity and particle size deviation of potassium humate granules, with higher standards for particle size uniformity and consistent tapped density. In the pharmaceutical sector, the retention rate of active ingredients must be kept stable to prevent performance loss caused by high-temperature oxidation. From an environmental perspective, rising costs for environmental compliance push enterprises to adopt green processes with low emissions and low energy consumption.

(2) Traditional spray dryers are prone to particle agglomeration and uneven particle size distribution, along with high energy consumption and complicated maintenance, which have become technical bottlenecks restricting industrial development. Conventional equipment fails to achieve precise temperature control during production, resulting in severe loss of active ingredients of potassium humate. This not only impairs product quality but also increases production costs. To tackle these challenges, Longxin Dressing has launched a new-generation superheated steam spray granulation and drying system based on market demands and technical expertise. Through process optimization and intelligent control, the system achieves dual improvement in product quality and production efficiency.

Technological Innovations of Longxin Drying: Superheated Steam Spray Granulation & Drying Technology for Potassium Humate

(1) Closed-loop Circulation Thermal Energy Management System for High Efficiency & Energy Saving

Longxin Drying innovatively develops a multi-stage vapor compression heat pump. The secondary steam generated during drying is compressed and reheated for recycling, which improves thermal efficiency. Combined with an intelligent waste heat recovery module, the system automatically adjusts the heat recovery ratio according to actual operating conditions, cutting energy consumption per ton of product compared with traditional processes and reducing annual operating costs substantially.

In addition, the equipment adopts a fully sealed nitrogen/steam circulation system to avoid heat dissipation and prevent external impurities from contaminating materials. This design complies with relevant safety standards and provides solid technical support for low-carbon production.

(2) Dynamic Coupling Temperature Control Technology to Guarantee Product Quality

A four-section temperature gradient control strategy is applied. By real-time adjustment of steam flow and atomization pressure, materials undergo precise treatment in three phases inside the drying tower: rapid dehydration, gradient solidification and surface activation.

In the pre-drying section, proper temperature and humidity are set for preliminary dehydration to lay a foundation for subsequent processes.
In the constant-rate drying section, temperature and airflow velocity are precisely regulated to achieve uniform drying.
In the falling-rate drying section, temperature is gradually lowered to avoid oxidative deterioration caused by overheating.
In the cooling and solidification section, dried granules are rapidly cooled to maintain stable properties.

Actual tests prove that this technology delivers stable and lower product moisture content, concentrated particle size distribution, higher sphericity and smaller particle size deviation, as well as improved flowability. It fully meets the stringent requirements of high-quality compound fertilizers and water-soluble fertilizers.

(3) Enhanced Granulation with Built-in Fluidized Bed to Solve Industrial Pain Points

Longxin Drying creatively integrates spray drying and fluidized bed technologies, with a dynamic fluidized bed installed at the bottom of the drying tower. Atomized wet materials directly enter the fluidization zone, where gas-solid two-phase turbulence realizes surface coating and densification of particles. This innovative design increases product bulk density and flowability index, and effectively solves the problem of moisture absorption and caking of potassium humate.

Before adopting our equipment, severe moisture absorption and caking troubled products, adversely affecting storage and transportation and leading to a high complaint rate. After application, the moisture absorption rate is reduced and caking is basically eliminated, greatly improving customer satisfaction.

(4) Full-process Intelligent Monitoring System for Higher Production Stability

Equipped with an Industrial Internet of Things (IIoT) platform, the system integrates multiple sensors to collect key parameters such as temperature, pressure and flow rate in real time. Digital twin models predict process deviations and perform automatic correction. Multiple safety interlock devices are configured to respond quickly to abnormal operating conditions, ensuring continuous production and personnel safety.

The Intelligent Cloud Control System builds digital twin models for the drying process to dynamically optimize spray pressure, hot air temperature and feed rate, and improve batch-to-batch consistency of finished products. Operators can monitor equipment status and remotely adjust process parameters via an intuitive interface, which greatly reduces labor costs and boosts productivity.

(5) Upgraded Safety Protection System to Ensure Operational Safety

Targeting the production characteristics of highly active substances like potassium humate, the equipment is fitted with multi-stage explosion-proof devices and an inert gas protection system. Dynamic oxygen concentration monitoring and automatic inerting technology are adopted to control the oxygen content inside the system and satisfy safety production regulations.

This solution has been successfully applied at a major domestic humic acid manufacturer, enabling long-term continuous operation with zero safety incidents and delivering reliable safeguards for safe production.

Application Cases and Industrial Value of Longxin Drying Technology

(1) After adopting Longxin drying equipment, enterprises have achieved simultaneous improvement in production efficiency and product quality. The capacity of a single unit is greatly increased compared with the original equipment, and the rate of high-grade products is elevated. The annual consumption of standard coal and carbon dioxide emissions are reduced significantly. The dust concentration in the production environment stays at a low level, fully complying with safety standards.

(2) At present, Longxin's superheated steam spray granulation equipment has been widely applied in major humic acid producing areas including Xinjiang and Inner Mongolia, serving numerous manufacturers and generating remarkable cumulative economic benefits.

(3) Driven by annual market growth, the demand for high-quality potassium humate products remains robust. Leveraging its first-mover advantages in superheated steam technology, Longxin Drying has entered strategic cooperation with multiple multinational enterprises, helping China's drying equipment technology expand into the global market.

Longxin Drying: Leading the Industry's Green Development via Technological Innovation

As a Specialized, Refined, Differential and Innovative (SRDI) "Little Giant" Enterprise, Longxin Drying owns a modern manufacturing base and a full range of precision processing equipment, and has obtained certifications for multiple management systems. Our R&D team invests a portion of annual revenue in technological innovation each year. The company has been granted numerous patents and participated in formulating a number of industrial standards.

Looking ahead, we will further promote the application of superheated steam technology in the humic acid industry. Focusing on intelligence, low carbon and customization, we deliver full life-cycle solutions covering process design, equipment manufacturing as well as operation and maintenance services, helping customers achieve the dual goals of cost reduction, efficiency improvement and green transformation.

At this critical stage when the humic acid industry is transforming toward refinement and advanced development, Longxin Drying takes superheated steam technology as a breakthrough to reshape the technical standards for potassium humate drying, and provides integrated solutions featuring high efficiency, energy conservation and environmental protection for the whole industry. Choosing Longxin Drying means choosing leading technology and reliable quality. We sincerely look forward to cooperating with more industry partners to create a promising future for the humic acid sector.

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Bid Farewell to Drawbacks of Traditional Water-soluble Fertilizer Granulation & Drying Potassium Humate Spray Drying Tower Ushers in a New Production Trend

Application Cases and Industrial Value of Longxin Drying Technology

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