Biomass mainly refers to wastes such as crop straw, forestry and wood processing. Biomass energy is an important renewable energy source. Biomass pellet fuel has high volatile content, easy precipitation, good carbon activity, flammability, low ash content, fast ignition, more fuel saving, and lower use cost. The formed biomass particles are small in volume, high in specificity, high in density, resistant to combustion, easy to store and transport, and the calorific value can reach between 3900-4800 kcal. It is an ideal new fuel and is widely used in domestic stoves and hot water boilers. , Industrial boilers and biomass power plants.
Wood Pellet Production Line Project
The Sawdust pellet production line project is 5t/h per hour, working 8 hours a day, and producing 40 tons of wood pellets a day. Working 300 days a year is 12,000 tons/year. The actual total investment of this project is 4 million yuan, with an annual output of 12,000 tons of shaped biomass pellets. There are 10 employees in this project, and the annual working time is about 300 days. The basic situation of the project is shown in Table 1:
Table 1 List of basic information of this project
|project name||5 T/h Biomass Sawdust Pellet Production Line Project|
|Location||Cangshuipu Village, Cangshuipu Town, Heshan District, Yiyang City|
|Project nature||New||Industry category and code||Non-metallic waste and scrap C4220 plus
|Area||2653m 2||Production scale||Annual production of 12,000 tons of biomass pellets|
|Investment situation||It is estimated that the total investment of the project is 4 million yuan, and the environmental protection investment is about 200,000 yuan, accounting for 5% of the total investment|
|The actual total investment is 4 million yuan, and the environmental protection investment is about 200,000 yuan, accounting for 5% of the total investment|
|Start time||July 2019||Completion time||August 2019|
|Labor quota||10 people||Work system||8 hours a day, 300 working days per year|
The construction content and actual construction content approved by the environmental impact assessment and approval department of this project are shown in Table 2:
Table 2 List of main construction contents of the project
|Serial number||Environmental impact assessment construction||Actual construction situation|
|structural work||Granulation area||1F, an area of about 400m 2 , mainly granulation step, plant located
east room, provided granulator 2
|Consistent with EIA|
|Auxiliary engineering||Office building||1F, covers an area of 60m 2 for office||Consistent with EIA|
Storage and Transportation Engineering
|Raw material area||1F, an area of about 700m 2 , the main raw material used for stacking, the bit
in the northern part of the plant
Consistent with EIA
|warehouse||1F, with an area of about 300m 2 , mainly used for stacking finished products, located in the
west of the plant
|Water supply||Provided by the factory's own well||Consistent with EIA|
|powered by||Uniformly supplied by the local power supply network||Consistent with EIA|
|Rain and sewage diversion system, no water is required for the production of this project, and no production wastewater is produced; domestic sewage is treated in septic tanks and used as fertilizer for comprehensive utilization and not
Consistent with EIA
|Environmental Engineering||Wastewater treatment||The project produced without water, no waste water is generated; by sewage of
the septic tank process used to make agricultural fertilizer, utilization, not discharged.
|Consistent with EIA|
Waste gas treatment
|The dust generated in the process of raw material storage, transportation, loading and unloading dust, product storage, transportation, loading and unloading, and packaging is discharged in an unorganized form after being settled in the workshop; the granulating dust is settled in the workshop after the bag dust removal treatment, and after the settlement, it is unorganized Form emissions, and reduce
unorganized dust emissions from the project by strengthening management and other measures .
Consistent with EIA
|Solid waste treatment||Waste lubricating oil and other hazardous waste temporarily stored in the temporary storage of hazardous waste between regularly referred to qualified units Sinotrans processing; garbage handed over to the sanitation department uniform removal of the
processing; floor cleaning and dust removal system to collect dust for return produce.
|Consistent with EIA|
|Noise prevention||Use low-noise equipment, reasonable layout, vibration and sound insulation, and strengthen equipment maintenance||Consistent with EIA|
The project will produce 12,000 tons of shaped biomass pellets per year. The specific product plan is shown in Table 3.
Table 3 List of project product plans
|Molded biomass pellets||Ten thousand tons||1.2||The diameter of the formed biomass particles is about 8mm, the length is about 8cm, the ash content is less than
or equal to 8.0%, the density is more than or equal to 1.1t/m 3 , and the low calorific value is 3200kg/kcal. The moisture content of the finished product is less than 5%.
|total||Ten thousand tons||1.2||/|
Compared with the EIA report and its approval stage, the raw and auxiliary materials and energy usage are the same. For details, see Table 4:
Table 4 List of project raw and auxiliary materials consumption
|Serial number||name||Annual consumption||Remarks|
|The crushed sawdust purchased from outside has a moisture content of about 8%.
It is stored in the raw material area without drying during the production process. The maximum storage capacity is 30t
|3||Electricity||30,000 KW•h||Powered by the power supply system of Cangshuipu Town|
Compared with the EIA report and its approval stage, the use of main production equipment is the same. For details, see Table 5:
Table 5 List of Major Equipment List
|Serial number||category||name||Specification model||Quantity (unit)||Remarks|
|1||produce||Wood pellet machine||508#||2 sets||Granulation process|
Transportation auxiliary equipment
|5||Green facilities||Waste gas treatment equipment||1 set||Air collecting hood + bag dust removal device|
The production process of this project is relatively simple, all processes are physical processes,
(1) Raw materials
The raw materials of the project are transported by vehicles to the raw material workshop for backup, and a certain amount of dust is generated during the raw material transportation.
The wood chips of this project have been crushed before entering the factory and can be directly processed into granules. The raw material for granulation is only sawdust without any additives. The principle of the pellet machine is that the fine material is rolled and extruded, and the wood chips are deformed and extruded into pellets under high temperature and high pressure. Under the conditions of high temperature and high pressure, the moisture in the raw materials is condensed into liquid water through pipelines and discharged to the outside environment in the form of steam. The raw materials are compressed into molded biomass particles and transported to the next process by a belt conveyor. The granulating process adopts electric heating, and the granulating temperature is 80℃~120℃. This process will generate a small amount of dust, water vapor and noise.
The compressed biomass pellets generally have a temperature of 40~50℃, and need to be cooled in the case of packaging. The pelletized product is transported to the finished product yard by a conveyor belt for natural cooling, and then packaged after cooling. The packaging process of this project is manual packaging .
Note: The raw material produced in this project is sawdust, which has been crushed before entering the factory, and the moisture content is about 8%, which meets the requirements of granulation and molding. Therefore, there is no need to dry during the production process. The water content is water under the action of high temperature and high pressure during the granulation process. The form of steam is lost.
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