Export of biomass steam boiler DZL4-1.25-T biomass particles to Thailand

1、 Preface

Biomass energy is a clean and renewable energy source that is almost sulfur free, has little nitrogen content, and has the advantages of nearly zero CO2 emissions. Among the various ways of utilizing and transforming biomass, one of the most mature, simple and feasible ways of large-scale, efficient and clean utilization of biomass is to achieve good combustion results without significant modifications to existing combustion equipment. Its promotion and application play an important role in promoting the development of biomass energy utilization technology in China, protecting the environment, and improving ecology. It not only reduces fuel costs, but also reduces SO_twoTo meet market demand, our company has designed and developed a chain grate steam boiler that burns biomass fuel, which solves the problem of treating these wastes and has good energy-saving and environmental protection benefits.

2、 Product Introduction

1. Structure Introduction

The new DZL series steam boiler is a single drum longitudinal water fire tube shell boiler, and the combustion equipment is a chain grate. The water cooled walls on the left and right sides of the furnace are radiative heating surfaces, and the two wings of the furnace are convective heating surfaces. Threaded smoke pipes are arranged inside the drum（ φ fifty-seven × 3.5) For the convective heating surface, the furnace wall adopts a new process of integral pouring and ramming of heat-resistant concrete, and the outer side of the boiler host is a three-dimensional protective plate shell.

The overall structure of the boiler body adopts an upper boiler drum, with water cooled wall pipes and headers arranged symmetrically on the left and right sides. Drum made of φ one thousand four hundred and twenty-eight × 16 cylinder and φ one thousand and four hundred × The front and rear tube plates of 14 are welded together. The water-cooled wall pipe is φ fifty-one × 3 GB3087-2008, the header is φ one hundred and fifty-nine × 6 GB3087-2008, the downcomer is φ one hundred and thirty-three × 6 GB3087-2008 The furnace layout of the boiler is reasonable and the combustion efficiency is high.

This series of boilers adopts the latest scientific research achievements, such as arched tube plates, threaded smoke pipes, etc., to solve the problems of tube plate cracks, water cooled wall tube explosions, low thermal efficiency, insufficient output, and poor adaptability to coal quality in shell boilers.

2. Combustion process

Biomass fuel is fed into the chain grate through the coal feeder and then enters the furnace for combustion. The generated flue gas enters the two wing convection tube bundle along the bottom of the drum through the outlet smoke window on the octagonal wall, enters the threaded flue pipe through the front smoke box, passes through the economizer and dust collector, and is drawn by the induced draft fan and discharged into the atmosphere through the chimney.

3. Technical characteristics

(1) The boiler drum is composed of an arched tube plate and a threaded smoke pipe, which changes the structure of the boiler drum from a quasi rigid body to a quasi elastic body, eliminates the tension support in the tube plate area, and reduces stress. The smoke tube inside the tube plate has been changed from two returns to a single return, solving the problem of tube plate cracks.

(2) Due to the arrangement of a rising tube row at the bottom of the drum, the stagnant water area at the bottom of the drum is eliminated, making it difficult for sludge to deposit. The high-temperature area of the drum can be well cooled, preventing bulging at the bottom of the drum.

(3) The use of efficient heat transfer threaded smoke pipes has achieved enhanced heat transfer effects, achieving the characteristics of fast boiler temperature rise and pressure rise, and improving the thermal efficiency of the boiler.

(4) Compact in structure, compared to similar boilers, it has a smaller overall size and saves investment in boiler room infrastructure.

(5) Stable operation, convenient adjustment, and sufficient output.

(6) The Heat transfer coefficient and thermal efficiency are improved by using threaded smoke pipe to enhance heat transfer, because the smoke has a disturbing effect in the pipe. The smoke pipe is not prone to dust accumulation and plays a self-cleaning role.

(7) The octagonal wall inside the furnace and the outlet smoke window have a certain dust reduction effect. The original dust concentration of the boiler is controlled below the standard, ensuring that the smoke and dust emissions of the boiler meet the national environmental protection regulations.