CN102322733A - Rotary drum and airflow mixed flow drying device for oil-tea fruit shell wastes - Google Patents

Abstract

A rotary drum and airflow mixed-flow drying device for camellia oleifera husk waste. The air outlet of the first-stage rotary drum dryer is connected to the double cyclone dust collector and is combined with the quadruple cyclone dust collector and the first-stage drying fan to form the first-stage drying ventilation and dust removal. passage, the feed inlet of the primary drum dryer is vertically connected to the primary drying feeder, the primary drying feeder is connected to the disperser, and the discharge port of the primary rotary drum dryer is connected to the secondary drying feeder The feeder, the secondary drying feeder is connected to the secondary airflow dryer. The technical effect of the present invention is that the waste camellia husks extracted from the active components are dried by rotating drum and air flow to make the water content below 18%, which meets the requirements of the production of camellia oleifera husk granular fuel.

Description

Camellia oleifera husk waste drum and airflow mixed flow drying device

technical field

The invention relates to a drying device, in particular to a drying device for camellia oleifera husk waste with a drum and airflow mixing.

Background technique

吨，，其能量约相当于世界主要燃料消耗的10倍；而作为能源的利用量还不到其总量的1%。作为能源，世界上利用是以煤、石油、天然气等不可再生能源为主。燃煤电厂、工业锅炉及民用锅炉向大气中排放大量的二氧化硫和一氧化氮等，使得中国的酸雨污染问题日益扩大；燃煤还产生大量的温室气体CO₂；同时，粉尘的大量排放，造成空气质量下降。不可再生能源的过度开发和利用，不仅带来了能源危机，更带来了日益严重的环境污染问题。据估计，我国大气中90%的二氧化硫、70%的烟尘和85%以上的二氧化碳，均来自煤炭的燃烧。与煤相比，生物质含灰少，含氮、硫也少，排放的NO_X和SO₂远小于化石燃料。因此，生物质能的利用已经成为新能源的一个重要方向。 Biomass is the solar energy fixed on the earth by the photosynthesis of plants, and the annual biomass produced by photosynthesis is about

Ton, its energy is equivalent to about 10 times of the world's main fuel consumption; and its utilization as energy is less than 1% of its total amount. As energy, the world's utilization is mainly based on non-renewable energy such as coal, oil, and natural gas. Coal-fired power plants, industrial boilers and civil boilers emit a large amount of sulfur dioxide and nitrogen monoxide into the atmosphere, which makes the problem of acid rain pollution in China increasingly expanding; coal combustion also produces a large amount of greenhouse gas CO ₂ ; at the same time, a large amount of dust discharges, causing Air quality drops. The excessive development and utilization of non-renewable energy has not only brought about an energy crisis, but also brought about increasingly serious environmental pollution problems. It is estimated that 90% of sulfur dioxide, 70% of soot and more than 85% of carbon dioxide in the atmosphere of our country come from the combustion of coal. Compared with coal, biomass contains less ash, nitrogen and sulfur, and emits far less _NOx and _SO2 than fossil fuels. Therefore, the utilization of biomass energy has become an important direction of new energy.

The development and utilization of biomass resources based on biomass energy has attracted the attention of governments and scientists around the world. Many countries have formulated corresponding development and research plans, for example, Japan's New Sunshine Project, India's Green Energy Project, the United States' Energy Farm and Brazil's Alcohol Energy Project, etc. A new biomass industry is booming around the world.

Biomass briquette fuel is to convert low-grade biomass with scattered distribution, loose texture and low energy density into commercial energy with uniform particles, high bulk density and high density. The most commonly used method for biomass molding fuel is compression molding technology, and the moisture content of biomass raw materials is the most critical factor in compression molding. If the moisture in the raw material is too high or too low, it cannot be molded well. For granular molding fuels, the moisture content of raw materials is generally required to be around 15% to 25%; for rod-shaped and block-shaped molding fuels, the moisture content of raw materials is required to be no more than 10%. Therefore, the drying of raw materials in the production of biomass pellet fuel is an indispensable key section of the production process.

Camellia oleifera husk waste After the active components are extracted, the waste camellia oleifera husk is mainly composed of crude fiber with a moisture content of more than 60%, which is not suitable for direct processing into pellet fuel. If the water is removed by drying and solidified into high-density granular fuel, it is an ideal fuel to replace coal, oil and natural gas. It can save energy and reduce emissions. It has good economic and social benefits. It is a kind of Efficient and clean renewable energy.

Contents of the invention

The object of the present invention is to provide a rotary drum and airflow mixed-flow drying device for camellia oleifera husk waste, which uses the rotary drum and airflow mixed-flow drying to treat the discarded camellia oleifera husk after active component extraction, so that the moisture content reaches below 18% , a device that meets the requirements for the production of Camellia oleifera husk pellet fuel, and solves the technical problems of high energy consumption, long drying time, and low drying efficiency in the drying process.

The present invention is achieved in this way, it includes biomass hot blast stove, secondary drying feeder, secondary airflow dryer, cyclone separator, secondary drying fan, return air pipe, disperser, primary drying feeder Dryer, first-stage rotary drum dryer, double cyclone dust collector, quadruple cyclone dust collector and first-stage drying fan, which is characterized in that the biomass hot blast stove is connected with the second-stage airflow dryer; the second-stage airflow dryer, cyclone The separator and the secondary drying fan are connected in turn, and the secondary drying fan is connected to the air inlet of the primary rotary drum dryer through the return air pipe, and the tail gas dried by the secondary airflow is used as the heat source of the primary rotary drum dryer; The air outlet of the rotary drum dryer is connected with the double cyclone dust collector and forms a first-stage drying, ventilation and dust removal passage with the quadruple cyclone dust collector and the first -stage drying fan. The inlet of the first-stage rotary drum dryer is connected vertically The primary drying feeder, the primary drying feeder is connected to the breaker, the discharge port of the primary rotary drum dryer is connected to the secondary drying feeder, and the secondary drying feeder is connected to the secondary airflow dryer.

The technical effects of the invention are: (1) The heat source adopts a biomass hot blast stove with two-stage combustion and two-stage dust removal for heat supply, realizing sustainable utilization of energy. Using staged combustion technology, the emissions of NO _X , SO ₂ , dust, etc. in the flue gas are low, realizing low pollution emissions in the production process of biomass pellet fuel; The heating medium of the first-stage drum drying and the second-stage mixed-flow drying process conform to the principle of energy cascade utilization, so that the heat energy of the drying medium can be fully utilized and the energy utilization efficiency of the drying system can be improved. The mixed-flow drying process is adopted, and the high-temperature hot air enters the drying system from the secondary airflow dryer to ensure that the moisture of the dried camellia oleifera husk waste can meet the requirements; (3) The drum and airflow mixed-flow drying are used to extract the active ingredients The discarded camellia oleifera husks are used to make the moisture content below 18%, which meets the requirements for the production of camellia oleifera husk pellet fuel.

Description of drawings

Fig. 1. Top view of Camellia oleifera husk waste rotary drum and airflow mixed flow drying device.

Figure 2. The front view of the drum and air mixed flow drying equipment for Camellia oleifera husk waste.

Figure 3. Schematic diagram of the connection between the primary rotary drum dryer and the secondary airflow drying fan.

Detailed ways

As shown in Fig. 1, Fig. 2, Fig. 3, the present invention is realized in this way, it comprises biomass hot blast stove 1, secondary drying feeder 2, secondary airflow dryer 3, cyclone separator 4, secondary Drying fan 5, return air pipe 6, breaker 7, primary drying feeder 8, primary rotary drum dryer 9, double cyclone dust collector 10, quadruple cyclone dust collector 11 and primary drying fan 12 , which is characterized in that the biomass hot blast stove 1 is connected with the secondary airflow dryer 3; the secondary airflow dryer 3, the cyclone separator 4 and the secondary drying fan 5 are connected in sequence, and the secondary drying fan 5 is connected to the secondary drying fan 5 through the return air pipe 6 The air inlet of the primary rotary drum dryer 9 is connected, and the tail gas dried by the secondary air flow is used as the heat source of the primary rotary drum dryer; the air outlet of the primary rotary drum dryer 9 is connected with the double cyclone dust collector 10 and connected with The quadruple cyclone dust collector 11 and the first-stage drying ventilator 12 form a first-stage drying ventilation and dust removal passage. The device 8 is connected to the breaker 7, the outlet of the primary drum dryer 9 is connected to the secondary drying feeder 2, and the secondary drying feeder 2 is connected to the secondary airflow dryer 3.

The movement process of Camellia oleifera husk waste during drying: (1) The wet camellia oleifera husk waste with high moisture content first enters the primary drum dryer 9 under the transport of the breaker 7 and the primary drying feeder 8 At the feed end of the drum, under the action of continuous lifting and dropping of the lifting board inside the drum, coupled with the drive of the airflow, the material moves from the feed end to the discharge end, and finally reaches the discharge port of the drum dryer; (2 ) enters the secondary airflow drying feeder 2 from the discharge port of the rotary drum dryer, and enters the acceleration section of the secondary airflow drying machine 3 under the conveyance of the secondary drying feeder 2, and the material is accelerated by the airflow drying The section and the hot air produce strong convective heat transfer and mass transfer, the material is dried and accelerated, and finally the gas-solid separation is carried out in the cyclone separator 4; (3) The dried material after the gas-solid separation enters into the Finished product silo.

The movement process of the drying medium (air) during the drying process: (4) Under the action of the fan 5 of the secondary airflow dryer, the drying medium (air) first passes through the biomass hot blast stove 1, and the air in the hot blast stove is heated to become a High-temperature hot air with strong hygroscopicity; (5) The high-temperature hot air enters the secondary airflow dryer 3 to exchange heat and quality with the semi-dry material from the primary dryer, absorbing the moisture in the material, so that the moisture in the material is continuously (6) The high-temperature hot air continuously performs heat and mass exchange and mixing with the dried materials in the secondary dryer 3, and finally reaches the cyclone separator 4. The air after gas-solid separation is transported to the air inlet of the first-stage tumble dryer 9 as a heat source for the first-stage drying; (7) Although the high-temperature hot air absorbs part of the moisture in the second-stage airflow drying process, it still has a certain drying capacity. In the primary rotary drum dryer 9, heat and mass exchange is performed with the wet camellia oleifera shell waste with high moisture content to remove part of the moisture in the wet material; (8) The high-temperature hot air passes through the secondary airflow dryer 3 and the primary rotary drum dryer After cylinder dryer 9, most of the moisture in the material has been absorbed, and the moisture in the air is close to saturation. At the same time, the temperature is dropping continuously, and there is no drying ability. After passing through the double cyclone dust collector 10 and the quadruple cyclone dust collector 11, it meets the requirements of environmental protection and is discharged into the atmosphere.

The present invention adopts the mixed-flow drying method of drum drying and airflow drying, which solves the problems of high energy consumption and low efficiency in traditional single drum drying or airflow drying. The high-temperature hot air first enters the secondary airflow dryer to further remove moisture from the initially dried Camellia oleifera husk waste, which can ensure that the moisture content of the dried product meets the requirements for the production of Camellia oleifera husk pellet fuel. The tail gas dried by the secondary airflow is used as the heat source of the primary drum drying, so that the heat energy of the hot air can be fully utilized, the efficiency is improved, the energy consumption is reduced, and the drying cost is saved.

Claims (1)

1. A camellia oleifera husk waste drum and airflow mixed-flow drying device, which includes a biomass hot blast stove, a secondary drying feeder, a secondary airflow dryer, a cyclone separator, a secondary drying fan, a return air pipe, Disperser, primary drying feeder, primary rotary drum dryer, double cyclone dust collector, quadruple cyclone dust collector and primary drying fan. Connection; the secondary airflow dryer, the cyclone separator and the secondary drying fan are connected in sequence, the secondary drying fan is connected to the air inlet of the primary rotary drum dryer through the return air pipe, and the tail gas dried by the secondary airflow is used as the primary The heat source of the rotary drum dryer; the air outlet of the primary rotary drum dryer is connected with the double cyclone dust collector and forms the primary drying, ventilation and dust removal channel with the quadruple cyclone dust collector and the primary drying fan. The feed port of the dryer is vertically connected to the primary drying feeder, the primary drying feeder is connected to the breaker, the discharge port of the primary rotary drum dryer is connected to the secondary drying feeder, and the secondary drying feeder The device is connected to the secondary airflow dryer.

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