CN-121988443-A - Biomass high-temperature explosion-proof grinding system and grinding process

Abstract

The invention belongs to the technical field of pretreatment of biomass energy and resource utilization, and particularly relates to a biomass high-temperature explosion-proof grinding system and a grinding process, which comprise a grinding machine, wherein the grinding machine is provided with a feed inlet, the top of the grinding machine is provided with a discharge outlet, the discharge outlet sends materials to a cyclone separator for separation and collection through a powder discharge fan, the bottom of the pulverizer is also provided with an adjusting gas circuit, the gas inlet end of the adjusting gas circuit is communicated with the top of the cyclone separator, and the adjusting gas circuit is also provided with a blower.

Inventors

• YANG SHUHUA
• LI ZAIFENG
• LEI TINGZHOU
• ZHANG JINGYUE
• ZHANG MENGJU
• GUAN QIAN
• YUE ZENGHE
• WANG XIN

Assignees

• 河南省科学院

Dates

Publication Date

20260508

Application Date

20260228

Claims (4)

1. 1. The biomass high-temperature explosion-proof grinding system is characterized by comprising a grinding machine, wherein a feeding hole is formed in the grinding machine, a discharging hole is formed in the top of the grinding machine, materials are sent to a cyclone separator for separation and collection through a powder discharge fan through the discharging hole, an adjusting gas circuit is further arranged at the bottom of the grinding machine, the gas inlet end of the adjusting gas circuit is communicated with the top of the cyclone separator, and a blower is further arranged on the adjusting gas circuit.
2. 2. The high-temperature explosion-proof biomass powder grinding system as set forth in claim 1, further comprising a heating assembly, wherein the heating assembly comprises a flue gas hot blast stove, the flue gas hot blast stove is provided with a burner, an air inlet and a natural gas inlet are arranged on the burner, and an outlet of the burner is communicated with the adjusting gas circuit.
3. 3. The high-temperature explosion-proof biomass powder grinding system as set forth in claim 1, wherein a bag-type dust collector is further arranged on the adjusting gas path.
4. 4. A milling process of a biomass high temperature explosion proof milling system according to any one of claims 1 to 3, comprising the steps of: s1, starting a burner, adjusting the air excess coefficient of the burner, producing flue gas with oxygen content lower than 1% as an airflow carrier, and heating the working temperature of a grinding system to 150-200 ℃; S2, adjusting the air quantity of a blower to enable the inlet and outlet air pressure of the mill to be 800-1500Pa, starting feeding, and adjusting the air quantity of a powder discharge fan to enable the granularity of biomass powder to be more than 80 meshes; S3, increasing the feeding amount, increasing the air quantity of a blower at the same time, keeping the air pressure at the inlet and outlet of the mill at a design level, and adjusting the air quantity of an exhaust fan to ensure that the granularity of the biomass powder meets the design requirement; s4, controlling the feeding amount, the heat load of the burner, the amount of a powder discharge fan and the air quantity of a blower, and controlling the granularity of biomass powder, the grinding temperature and the oxygen content of the system atmosphere to be below 1% under the control of a PLC.

Description

Biomass high-temperature explosion-proof grinding system and grinding process Technical Field The invention belongs to the technical field of pretreatment of biomass energy and resource utilization, and particularly relates to a biomass high-temperature explosion-proof grinding system and a grinding process. Background The biomass resources in China are rich and various, and particularly various agriculture and forestry residues have the characteristics of wide distribution and large physical and chemical property difference, and the biomass resources cannot be efficiently utilized in a large scale and can be stacked and burned at will, so that the problems of resource waste, environmental pollution and the like are caused. The large-scale energy and resource utilization of biomass is an important way for high-value clean utilization. The steam power generation system of the large-scale pulverized coal boiler in China has the power generation efficiency reaching more than 40 percent, and the biomass is pulverized and then is burnt with the coal in the pulverized coal boiler in a coupling way, so that the combustion characteristic of the biomass is superior to that of the power coal for power generation, the boiler efficiency is basically not reduced under a certain blending ratio, and the ultra-clean emission requirement can be met. After the powder is made (less than 80 meshes), the combustion characteristic is close to that of coal, and the coal can be directly and efficiently combusted in a coal powder furnace in a coupling way. However, as the main components of the biomass are cellulose, hemicellulose and lignin, the biomass is formed into a biomass whole through a complex space structure, the biomass has very high strength and toughness, the biomass is not easy to prepare into powdery fuel, the particles are fibrous, and the biomass is coupled with coal in a pulverized coal furnace for combustion, so that the problems of blockage of a conveying pipeline and a burner, incomplete combustion and the like are easily caused. Biomass is also poor in thermal stability, cellulose is rapidly decomposed in a narrow temperature range (300-400 ℃), hemicellulose is thermally decomposed in a temperature range of 200-350 ℃, lignin is thermally decomposed in a wide temperature range (150-500 ℃) and the reaction starts at 150 ℃. When the temperature of biomass exceeds 200 ℃, hemicellulose and lignin start to decompose, a stable three-dimensional space structure of the biomass is destroyed, the strength and toughness start to be reduced, the crushing becomes easy, and the possibility is provided for biomass milling. In the milling process of biomass, airflow with a certain flow velocity is needed, materials with a certain granularity are blown out of the mill, and meanwhile baked biomass is dried, so that milling energy consumption can be reduced. In the pulverizing process of baked biomass, the heating of gas, the collision friction of steel and materials, the rising of biomass temperature can separate out partial combustible gas, and the partial combustion of biomass is easily caused to the reaction with the oxygen in the gas, has great potential safety hazard. Disclosure of Invention The invention aims to provide a biomass high-temperature explosion-proof grinding system and a grinding process, which can realize grinding treatment of biomass under the conditions of a certain temperature and low oxygen content. In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides an explosion-proof milling system of living beings high temperature, includes the milling machine, is equipped with the feed inlet on the milling machine, and the milling machine top is equipped with the discharge gate, the discharge gate is sent the material to cyclone separation through the row powder fan and is collected, the milling machine bottom still is equipped with one and adjusts the gas circuit, adjust gas circuit inlet end and cyclone top UNICOM, still be equipped with a air-blower on the regulation gas circuit. Further, the air conditioner further comprises a heating assembly, the heating assembly comprises a flue gas hot blast stove, the flue gas hot blast stove is provided with a combustor, an air inlet and a natural gas inlet are formed in the combustor, and a combustion furnace outlet is communicated with the adjusting gas circuit. Furthermore, a bag-type dust remover is arranged on the air conditioning path. Another object of the present invention is to provide a milling process of a biomass high-temperature explosion-proof milling system, comprising the following steps: S1, starting a combustor to adjust the load of the combustor and the air excess coefficient to produce flue gas with oxygen content lower than 1% as an airflow carrier, and heating the working temperature of a grinding system to 150-200 ℃; S2, adjusting the air quantity of a blower to enable the inlet and out