Brief Introduction

The tunnel kiln is a continuous thermal processing equipment tailored for large-scale red brick firing, featuring a linear tunnel structure with fixed kiln body and moving brick trolleys. It realizes uninterrupted production through sequential preheating, high-temperature sintering and cooling zones, which fundamentally solves the low efficiency problem of traditional intermittent kilns. Adopting advanced heat exchange technology, the kiln recycles waste heat from the cooling zone to heat the preheating zone, cutting energy consumption by 30% compared with conventional kilns. Its closed sintering environment ensures stable temperature control and consistent brick quality, making it the core equipment for modern red brick production plants with large output and high quality requirements. The automated operation also reduces manual intervention, improving production safety and reducing labor costs effectively.

Features

1. High Continuous Production Efficiency

The tunnel kiln runs in a 24/7 continuous mode without frequent start-stop operations of traditional kilns. Brick blanks are loaded on trolleys and move steadily through each thermal zone at a set speed, with the production capacity reaching 50,000-200,000 standard bricks per day according to the kiln size. This continuous workflow eliminates the heat loss and time waste caused by intermittent firing, significantly raising the overall production efficiency of red brick enterprises and meeting the large-scale supply demand of construction projects.

2. Energy Saving & Environmental Protection

Equipped with an intelligent waste heat recovery system, the kiln collects high-temperature waste heat from the cooling section (300-500℃) through heat exchangers and transports it to the preheating zone to preheat brick blanks and combustion air. This reduces the consumption of coal, natural gas and other fuels by more than 25%. Meanwhile, the kiln is equipped with a professional dust removal and desulfurization device, which controls the emission of dust and harmful gases within national environmental standards, realizing clean production and reducing the environmental impact of red brick firing.

3. Uniform Sintering & Stable Brick Quality

The tunnel kiln is designed with a multi-point temperature detection and automatic control system, which ensures the temperature difference in the sintering zone is within ±5℃. The brick blanks are heated and cooled evenly in the sealed kiln body, avoiding the defects of cracking, deformation and inconsistent color caused by uneven temperature in traditional kilns. The finished red bricks have high compressive strength (≥10MPa), low water absorption and good frost resistance, with the qualified rate reaching more than 98%, which fully meets the quality standards of building structural bricks and decorative bricks.

Main Applications

Residential Building Construction: As the basic wall material, the red bricks fired by the tunnel kiln are widely used in the construction of load-bearing walls, non-load-bearing partition walls and exterior walls of rural and urban residential buildings. Their high compressive strength ensures the structural stability of buildings, and the good thermal insulation performance improves the indoor thermal comfort of residential buildings.

Industrial Building Construction: Applied to the construction of factory workshops, warehouses, power distribution rooms and other industrial buildings, the high-quality red bricks can bear the heavy load of industrial equipment and resist the erosion of industrial environment, with strong durability and long service life.

Civil Engineering & Municipal Construction: Used in the construction of municipal facilities such as road curbs, square pavements, drainage ditches and small bridge abutments. The frost resistance and wear resistance of tunnel kiln-fired red bricks adapt to the complex outdoor natural environment and long-term use requirements of municipal engineering.

Old Building Renovation: Suitable for the renovation of old residential areas, historical buildings and traditional courtyards. The red bricks fired by the tunnel kiln can be customized in size and color to match the original building style, realizing the combination of traditional building features and modern construction quality.

Garden & Landscape Engineering: Used in the construction of garden pavilions, flower beds, retaining walls and landscape paths. The natural red color of the bricks is coordinated with the garden environment, and the good processing performance allows for personalized shaping to meet the diverse design needs of landscape projects.

FAQs

Q1: What is the optimal firing temperature for red bricks in the tunnel kiln?

A1: The optimal sintering temperature range is 950-1050℃. This temperature ensures the complete sintering of clay raw materials in the brick blanks, forming a dense internal structure, while avoiding over-firing that causes brick melting and deformation or under-firing that leads to low strength.

Q2: How long is the whole firing cycle of red bricks in the tunnel kiln?

A2: The full cycle including preheating, sintering and cooling is generally 20-36 hours. The specific time is adjustable according to the raw material type of brick blanks, kiln design parameters and the required strength of finished bricks, and the automated control system can flexibly modify the trolley moving speed to adjust the cycle.

Q3: Can the tunnel kiln be adjusted to fire red bricks of different sizes and specifications?

A3: Yes, it can be flexibly adjusted. The kiln is equipped with adjustable brick trolley brackets and spacing, which can adapt to the firing of standard bricks, hollow bricks, porous bricks and other red brick products of different sizes. Meanwhile, the temperature and air volume of each zone can be independently controlled to match the sintering requirements of different brick types.

Q4: What daily maintenance work is needed for the tunnel kiln?

A4: Daily maintenance mainly includes three aspects: first, checking the temperature sensors and control valves to ensure accurate temperature control; second, cleaning the dust and slag in the kiln body and heat exchange equipment to avoid heat transfer efficiency reduction; third, inspecting the wear of the trolley track and sealing parts, and timely replacing the damaged parts to prevent heat loss and air leakage. Regular monthly comprehensive maintenance is also required to extend the service life of the kiln.