Online clinker bulk density measurement system

Product Overview

The ITECA clinker bulk density online inspection system is a fully automated, in-line measurement device specifically developed for quality control in cement production. It addresses the core requirements of automated bulk density and particle-size distribution analysis of cement clinker, along with real-time data feedback, replacing the outdated manual sampling and manual testing approach and enabling unmanned operation across the entire process—from sampling and analysis to material return.

The product is deeply tailored to meet the digital and intelligent transformation needs of cement enterprises, seamlessly integrating with plant DCS automation control systems. It delivers high‑frequency, precise, real‑time data on clinker specific gravity and particle size distribution in the calcination process, effectively addressing industry‑wide pain points such as heavy workloads, harsh operating conditions, significant measurement errors, and data lag associated with traditional testing methods. As a result, it serves as a core quality‑monitoring solution for stabilizing kiln conditions, optimizing calcination processes, improving product quality while reducing energy consumption, and enabling intelligent operational control.

Industry Pain Points and Application Requirements

In the cement clinker production process, bulk density and particle size distribution are key indicators for assessing clinker sintering quality, monitoring kiln temperatures, and guiding production optimization. However, the conventional manual inspection approach faces multiple bottlenecks, severely limiting both production efficiency and the level of quality control.

1. Inefficient and delayed detection : Manual sampling, sieving, and weighing are cumbersome, labor-intensive, and inefficient, with delayed data feedback that makes it difficult to respond promptly to fluctuations in kiln conditions.

2. Large measurement errors affect production decision-making: Manual operations are subject to subjective errors, and sampling lacks sufficient representativeness, resulting in test data that fails to accurately reflect the true quality of clinker and potentially leading to deviations in process adjustments.

3. Harsh working conditions and high labor intensity: At the clinker sampling site, dust levels are high and temperatures are elevated, resulting in a harsh working environment. Dedicated personnel are required to carry out sampling, testing, and cleanup, leading to significant physical strain for inspection staff.

4. Poor intelligent adaptability constrains transformation: Manual data inspection cannot be integrated in real time with enterprise automation control systems, failing to provide the data support needed for intelligent production decision-making and thereby hindering the digital transformation of cement enterprises.

As the cement industry advances its transformation toward intelligence and sustainability, fully automated, online, high‑frequency measurements of particle size distribution have become a critical requirement for cement producers seeking to optimize production quality control and reduce operating costs.

Core Technological Advantages

1. Online real-time monitoring with rapid response: The equipment is installed on-site and automatically samples from the clinker stream without any manual intervention, enabling simultaneous measurement of bulk density and particle size distribution. With a sampling frequency of once per hour and real-time data feedback, it completely eliminates the lag inherent in conventional testing methods.

2. Precise detection, reliable data: It employs a Siemens S7‑1500SP series PLC control system, with weighing module accuracy reaching 1 g and volumetric flow measurement accuracy of ±15 g/L. The system can precisely output the proportion of particles in four size ranges—less than 5 mm, 5–7 mm, 7–20 mm, and greater than 20 mm—ensuring highly representative sampling and eliminating human‑operator errors.

3. End-to-end automation, unattended operation: It enables fully automated operations across the entire process—sampling, screening, testing, and material re‑processing—eliminating the need for dedicated on‑site personnel, significantly reducing manual labor intensity, and lowering labor costs.

4. Data interconnection, intelligent collaboration: Equipped with standard communication interfaces, the system enables real-time integration of monitoring data into the enterprise’s DCS, providing robust data support for kiln condition adjustments and process optimization, thereby helping the enterprise achieve intelligent production decision-making.

5. Green and durable, suitable for industrial applications: A fully sealed inspection and conveying system minimizes dust emissions and enhances the working environment; the equipment is wear‑resistant and corrosion‑protected, making it well suited for continuous cement production and high‑temperature dusty industrial applications.

6. Modular design, flexible adaptation: The system features a modular design, with the crushing‑conveying and sample‑retention subsystems offered as optional modules. It can be flexibly configured to meet specific enterprise requirements and is easy to install and maintain.

System Composition

The ITECA clinker bulk‑weight automatic inspection system features a modular design, comprising three core modules: a sampling system, an inspection system, and a crushing‑conveying‑and‑sample‑retention system (optional). It offers flexible installation and convenient operation and maintenance, and can be tailored to meet the production requirements of cement plants of varying scales.

1. Sampling system: Equipped with a PP101 beam-type sampler, this device is installed at the top of the clinker silo, at the discharge outlet of the zipper feeder, or at the tail end of the grate cooler. It can automatically collect clinker samples ranging from 0 to 50 mm in size and features sensor‑based positioning and an automatic cleaning function. The sampler can withstand sample temperatures up to 400°C, with a single sampling volume of 1.8 liters, ensuring precise and stable sampling.

2. Detection System: The core comprises the Lisheng specific gravity analyzer body, integrating a rotary drum screen, a sieving and measurement unit, a Lisheng specific gravity measurement unit, a residual material handling unit, and an electrical control cabinet. It can simultaneously perform particle size distribution analysis and specific gravity testing, enabling precise sieving and weighing across four particle size ranges: less than 5 mm, 5–7 mm, 7–20 mm, and greater than 20 mm. Upon completion of testing, the sample is automatically returned to the production system.

3. Crushing–Conveying and Sample Retention System (optional): It consists of a jaw crusher, a conveying system, a cyclone receiver station, and a sample‑retention device. The system can crush samples to below 5 mm and transport them over long distances via sealed pipelines (up to 180 m). The sample‑retention device collects at least one sample per hour, with a total daily retention of no less than 12 kg, thereby meeting the requirements for physical‑strength analysis of clinker.

Detection Principle

The equipment employs a detection principle that combines rotary drum screening with precise weighing, resulting in a scientifically sound and highly efficient process. It can simultaneously determine the particle size distribution of clinker and measure its bulk density. The specific procedure is as follows:

1. Sampling: The sampler collects a clinker sample ranging from 0 to 50 mm from the material stream. The sample is then fed into a rotary drum screen equipped with 5-mm, 7-mm, and 20-mm circular-hole sieves, where it is sequentially screened from fine to coarse, yielding four particle-size fractions: less than 5 mm, 5–7 mm, 7–20 mm, and greater than 20 mm. After weighing, the system automatically calculates the mass fraction of each size fraction.

2. Lisheng Heavy-Duty Testing: During the screening process, 5–7 mm samples are automatically collected into a 0.5 L conical volumetric bucket. The system continuously accumulates the sample weight; once the target weight is reached, a scraper automatically levels off any excess material. Subsequently, a load cell performs precise weighing, yielding the bulk density of the clinker.

3. Data Processing: The instrument performs one measurement per hour, with data automatically uploaded to the enterprise quality platform or the DCS system. Upon completion of the analysis, the sample is returned to the clinker production line via a recirculation device, enabling material recycling.

This detection principle has been extensively validated in industrial settings, delivering high accuracy and reliability with rapid response. It is well-suited to the continuous production requirements of cement clinker, ensuring that the data accurately reflects both clinker quality and kiln operating conditions.

Application Value and Benefits

1. Optimizing Production Control: Real-time monitoring data can promptly reflect clinker sintering conditions and kiln temperatures, enabling operators to adjust fuel consumption, kiln speed, and other process parameters in a timely manner, thereby stabilizing kiln operation and improving clinker calcination quality.

2. Supporting cost reduction and efficiency improvement: It replaces manual inspection, reduces the need for laboratory personnel, and lowers labor costs; end-to-end automated operations enhance testing efficiency, minimize material waste, and improve the working environment while reducing environmental compliance costs.

3. Ensuring product quality: Eliminate human‑operator errors, standardize and enhance the precision of specific gravity and particle‑size distribution measurements, ensure consistent clinker quality, and strengthen product market competitiveness.

4. Empowering Intelligent Transformation: Address the shortcomings in online cement‑production monitoring, enabling seamless integration between inspection data and automated control systems. This provides critical data support for enterprises’ intelligent manufacturing and data‑driven decision‑making, driving the transformation of cement producers from manual to smart process control.