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I. General Introduction to Biomass Boilers
Biomass boilers have a wide range of fuel sources, which are renewable green energy. They contain almost no sulfur and little ash. During their growth process, they can absorb all CO2 generated during combustion, achieving zero CO2 emissions. Biomass energy will gradually replace coal and become one of the main energy sources.
Biomass fuels include straw, wood branches, bamboo and wood processing waste, grain husks, fruit shells, sugar residue, oil residue, etc. According to their shape and size, they can be divided into three types: chips (≤3mm), pieces (≤50mm), and strips/blocks (>50mm).
Since 2003, our company has jointly developed biomass boilers with well-known domestic universities and absorbed advanced technologies from domestic and foreign counterparts, and continuously improved them in practical operation. At present, we have formed mature and stable technologies, and the products have been widely used. According to the characteristics and shape sizes of different biomass, we have developed four combustion methods: fixed grate, traveling grate, chain grate and chamber combustion, three main body structures: horizontal water tube, single vertical and double vertical, and four series of biomass fuel boilers.
Different from the structure of coal-fired boilers, the main characteristics of our company's biomass fuel boilers are as follows: through the secondary air designed and arranged in the furnace, the flue gas dynamic conditions are disturbed, oxygen is supplemented in time to burn out volatile matter, and thermal efficiency is improved while reducing emissions. The reasonable design ensures the protection of the arch and the rear grate, and avoids periodic micro-explosion of the furnace. For waste with high moisture content, the length of the preheating section is increased, effective heat sources are provided for heating, or it is directly put into the high-temperature section of hot flue gas. For the prominent peak load of gas consumption, or waste containing glue and other coking-prone components, a large number of heating surfaces are arranged in the furnace to solve the problem. For waste with various states such as blocks, strips, pieces, chips and powder, a variety of feeding methods and single feeding methods are designed for users to choose.
Compared with coal-fired boilers, biomass fuel has low cost, which greatly reduces the operation cost. Our company can carry out separate design according to the user's requirements for various biomass fuels, providing users with products of optimal value.
II. Introduction to DZL Series Biomass Chain Grate Steam Boiler
1. Applicable Fuels
This product adopts a chain grate, and the applicable fuels are formed granular fuels. A small amount of wood strips and wood blocks can be added, and it can also be co-fired with coal.
2. Structural Features
1. The drum is composed of arched tube sheets and threaded flue tubes, which changes the drum from a quasi-rigid body to a quasi-elastic structure, eliminates the bracing members in the tube sheet area, and reduces stress. The flue tubes in the tube sheet are changed from two passes to a single pass, solving the problem of tube sheet cracks.
2. Due to the arrangement of riser tube rows at the lower part of the drum, the dead 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 the lower part of the drum from bulging.
3. The high-efficiency heat transfer threaded flue tubes are adopted to achieve the effect of enhanced heat transfer, realizing the characteristics of fast temperature rise and pressure rise of the boiler, and improving the thermal efficiency of the boiler.
4. Compact structure, compared with the same type of boiler, it has small overall dimensions, saving the capital investment of the boiler room.
5. Stable operation, convenient adjustment and sufficient output.
6. Threaded flue tubes are used to enhance heat transfer, improving the heat transfer coefficient and thermal efficiency. Due to the disturbance of flue gas in the tubes, it is not easy to accumulate dust in the flue tubes, playing a self-cleaning role.
7. The splayed wall and outlet smoke window in the furnace have a certain dust reduction effect, controlling the original dust emission concentration of the boiler below the standard, and ensuring that the boiler smoke and dust emission meets the indicators specified in the national environmental protection regulations.
8. The unique double-layer secondary air design improves the ignition conditions of biomass fuel. An independent air chamber is adopted to achieve reasonable air distribution, forming an aerodynamic field in the furnace that is conducive to combustion, resulting in high combustion temperature and high combustion efficiency.
3. Performance Features
1. Simulated speed-controlled combustion can be realized without deflagration;
2. The combustion ignition speed can be controlled by adjusting the speed-controlled secondary air volume;
3. Secondary air is arranged on the front and rear arches to ensure secondary combustion of fly ash after particle decomposition, with high combustion efficiency;
4. Adopting scale-type chain grate and mechanized feeding, with uniform feeding, stable combustion, convenient control, not easy to backfire, and convenient mechanical ash cleaning.
III. Basic Parameters
Rated Evaporation Capacity | 0.5-35t/h |
Thermal Efficiency | ≥85% |
Application Scope | Chemistry, plastics, rubber, construction industry, forestry, concrete steam curing, plate processing, pharmaceutical industry distillation, etc. |
Applicable Fuels | Biomass, coal, straw, rice husk, palmaceae and granular fuels, etc. |
DZL series biomass steam boiler schematic diagram
Technical parameter table
Model Project | DZL1-0.7-T DZL1-1.0-T DZL1-1.25-T | DZL2-0.7-T DZL2-1.0-T DZL2-1.25-T | DZL4-1.25-T DZL4-1.6-T | DZL6-1.25-T DZL6-1.6-T | DZL8-1.25-T DZL8-1.6-T | DZL10-1.25-T DZL10-1.6-T （Up and down assembly） | |
Rated evaporation capacity(t/h) | 1 | 2 | 4 | 6 | 8 | 10 | |
Rated steam pressure(MPa) | 0.7/1.0/1.25 | 0.7/1.0/1.25 | 1.25/1.6 | 1.25/1.6 | 1.25/1.6 | 1.25/1.6 | |
Rated steam temperature(℃) | 170/184/194 | 170/184/194 | 194/204 | 194/204 | 194/204 | 194/204 | |
Rated feedwater temperature(℃) | 20 | 20 | 20 | 20 | 20 | 20 | |
Heating surface area(㎡) | noumenon | ~33 | ~50 | ~100 | ~170 | ~200 | ~250 |
Economizer | 10.56/10.56/20.7 | 27.6 | 52.48/33.12 | 87.2 | 98 | 174 | |
Effective area of grate(㎡) | 2.22 | 4.1 | 5.85 | 7.95 | 9.75 | 10.77 | |
Fuel type | Biomass pelletized fuel | ||||||
Boiler fuel consumption（kg/h) | ～200 | ～400 | ～800 | ～1200 | ～1600 | ～2010 | |
（Smoke exhaust temperature℃） | ~150 | ~150 | ~150 | ~150 | ~150 | ~150 | |
Boiler thermal efficiency（%） | ~82 | ~82 | ~82 | ~82 | ~82 | ~82 | |
Maximum weight of transported items（t） | 17 | 23 | 25 | 35 | 45 | 33（Up） 28（Down） | |
Maximum transport size L×W×H（mm） | 5.1×2.2×3 | 5.5×2.3×3.3 | 6.6×2.6×3.6 | 8.2×2.9×3.8 | 8.1×3.1×3.8 | 7.7×3.2×3.6 8.6×3.0×2.6 | |
