The Gas Supplement Regulator (Secondary Gas Supplement Device) is a key piece of equipment in the pneumatic conveying system for pulverized coal, primarily used to optimize the conveying process of high-concentration pulverized coal. Its core functions, structural features, and applications are as follows:
I. Core Functions and Working Principles
Diluting High-Concentration Pulverized Coal: Installed at the outlet of the pulverized coal main pipe of the injection tank, it supplements gas (nitrogen or air) to dilute high-concentration pulverized coal, forming a uniform dense-phase solid-gas two-phase flow, ensuring thorough mixing of pulverized coal and gas.

Adjusting Conveying Parameters:
By regulating the bypass gas supplement volume, it can control the powder flow rate over a wide range, disrupt the material column formed during conveying, and achieve stable long-distance conveying.
Utilizing a swirling air duct design (improved straight cone annular gap structure), it ensures more uniform mixing of powder and gas, reduces pulsation phenomena, enhances conveying capacity, and lowers failure rates.
II. Structural Types and Design Features
Structural Classification:
Adjustable Type: Composed of inner and outer sleeves, with the inner sleeve conveying pulverized coal and the outer sleeve annular gap conveying supplementary gas; by adjusting the round nut, the gap of the gas supplement duct is altered to control gas volume and flow rate, though it is heavier in structure and higher in cost.
Non-Adjustable Type: Simple structure, easy replacement, low cost, suitable for fixed operating conditions.
Innovative Design:
The inner and outer sleeve design allows the secondary air to jet at a certain angle, mixing circumferentially with the central powder, thereby improving mixing efficiency.

Wide range of gas volume adjustment, meeting the needs of different conveying distances, making it a core device for long-distance dense-phase conveying.
III. Technical Parameters and Scope of Application
Applicable Media: Pulverized coal + nitrogen/air.
Design Pressure: 1.0MPa, 1.6MPa, 2.5MPa.
Design Temperature: 100°C.
Common Specifications: DN50, 65, 80, 100, 125, 150, etc.
Application Fields: Blast furnace coal injection, power plant fly ash conveying, cement, dust removal systems, and other pneumatic conveying scenarios for powders.
IV. Manufacturers and Procurement Information
Main Production Areas: Rizhao, Shandong; Mentougou, Beijing.
Reference Price: For specifications like DN65/80/100, minimum order quantity ≥3 units, unit price starting from approximately ￥1200.
Physical Examples:
Images of Gas Supplement Regulator DN150/DN25
Images of Gas Volume Regulator from Physical Manufacturers
V. Advantages Summary
Efficiency Improvement: Reduces conveying energy consumption and costs, with low failure rates and long service life.
Operational Flexibility: Precise control through nut adjustment, adapting to changes in production demands.