Maize straw round packing pulverizing system for gasification

Abstract

The invention relates to a corn straw round packing material pulverizing system for gasification, and relates to the technical field of biomass straw pretreatment. The device comprises a double-shaft shredding machine, drying, soil-removing and impurity-removing integrated equipment, a hammer crusher and a pulverizer, feeding belts are arranged between the double-shaft shredding machine and the drying, soil-removing and impurity-removing integrated equipment, and feeding belts are arranged between the drying, soil-removing and impurity-removing integrated equipment and the hammer crusher; and a first cyclone dust collector and a first bag-type dust collector are arranged between the hammer crusher and the pulverizer. The device has the effect that the functions of soil removal, impurity removal, drying, pulverizing and the like can be taken into account during straw pretreatment pulverizing.

Description

Technical Field

[0001] This application relates to the technical field of biomass straw pretreatment, and particularly to a powder-making system for round bales of corn straw for gasification. Background Art

[0002] Biomass energy is a renewable carbon source, with characteristics such as being renewable, low-pollution, abundant in total quantity, widely applicable, and widely distributed; converting it into combustible gas through biomass gasification technology for replacing coal and natural gas for heating or power generation has important significance.

[0003] The straw gasification technology requires the straw to be made into powder with a particle size less than 1 mm. Pretreatment powder-making is a key technology for biomass gasification. The quality of the powder directly affects the pneumatic conveying and the stability of the biomass gasifier. Since the round bales of corn straw contain impurities such as soil, stones, and wood blocks and have a high moisture content, it is difficult to make powder. The existing pretreatment powder-making equipment is difficult to take into account functions such as soil removal, impurity removal, drying, and powder-making, so it needs to be improved. Summary of the Invention

[0004] In order to be able to take into account functions such as soil removal, impurity removal, drying, and powder-making during straw pretreatment powder-making, this application provides a powder-making system for round bales of corn straw for gasification.

[0005] The powder-making system for round bales of corn straw for gasification provided by this application adopts the following technical solutions: A powder-making system for round bales of corn straw for gasification includes a double-shaft shredder, an integrated drying, soil removal, and impurity removal device, a hammer mill, and a pulverizer. Feeding belts are arranged between the double-shaft shredder and the integrated drying, soil removal, and impurity removal device, and between the integrated drying, soil removal, and impurity removal device and the hammer mill. A first cyclone dust collector and a first bag filter are arranged between the hammer mill and the pulverizer.

[0006] By adopting the above technical solutions, this application combines drying and soil removal. On the one hand, it dries the straw to reduce the moisture content and improve the grindability of the straw. On the other hand, after the straw is dried, it is easier to remove soil, improving the soil removal rate, and the flue gas can use waste heat flue gas to improve the energy utilization rate. The integrated drying, soil removal, and impurity removal device combines the functions of drying, soil removal, impurity removal, and powder-making, with a simple equipment structure, saving investment and floor space.

[0007] Preferably, the integrated drying, soil removing and impurity removing equipment includes an equipment support, an impurity removing box, a feeding hopper, a primary drum screen, a secondary drum screen, a dust collection hood and a discharge hopper. The impurity removing box is arranged on the equipment support, the feeding hopper is arranged on the outer wall of the impurity removing box, the primary drum screen and the secondary drum screen are both arranged inside the impurity removing box, the primary drum screen is connected to the feeding hopper, the secondary drum screen is sleeved outside the primary drum screen, a tertiary screen is arranged on the inner top wall of the impurity removing box, the dust collection hood is arranged outside the tertiary screen, and the discharge hopper is arranged at the bottom of the impurity removing box.

[0008] By adopting the above technical solution, the round bales of corn straw are manually unpacked and fed into the double-shaft shredder by the feeding belt for primary crushing to a particle size of <5 cm, then conveyed to the integrated drying, soil removing and impurity removing equipment through the feeding belt for impurity removal. After removing impurities, they are conveyed to the hammer mill through the feeding belt and finely crushed to <5 mm by the hammer mill. The finely crushed materials are collected by the first cyclone dust collector and the first bag dust collector and then conveyed to the flour mill. The finished powder of <1 mm is obtained by grinding in the flour mill and used as the material for the backend gasifier.

[0009] Preferably, a material magnetic separator is arranged at one end of the discharge hopper away from the impurity removing box.

[0010] By adopting the above technical solution, setting the material magnetic separator can remove sundries such as iron wires and iron sheets in the round bales of corn straw, so that the iron removal effect can be considered when preprocessing the round bales of corn straw for powder making.

[0011] Preferably, an air inlet pipe is arranged on the side wall of the impurity removing box, and the air inlet pipe is communicated with a hot flue gas source.

[0012] By adopting the above technical solution, setting the air inlet pipe and the hot flue gas source can dry the inside of the impurity removing box, so that the drying effect can be considered when preprocessing the round bales of corn straw for powder making, and the grindability of the straw can be improved.

[0013] Preferably, the dust collection hood is communicated with a second cyclone dust collector and a second bag dust collector.

[0014] By adopting the above technical solution, setting the dust collection hood, the second cyclone dust collector and the second bag dust collector can make the powder making pretreatment process take into account the soil removal effect to prevent environmental pollution.

[0015] Preferably, the aperture of the primary drum screen is 5 cm, the aperture of the secondary drum screen is 5 mm, and the aperture of the tertiary screen is 1 mm.

[0016] By adopting the above technical solution, the method of grading and screening can effectively improve the accuracy of powder making pretreatment and reduce the impurity content in the powder.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application can make the round bales of corn straw into white granular powder with a particle size of < 1 mm, improving the carbon utilization rate; 2. The drying, soil removal and impurity removal integrated equipment of the present application combines the functions of drying, soil removal and impurity removal, with a simple equipment structure, saving investment and floor space; 3. The present application combines drying and soil removal. On the one hand, drying the straw reduces the moisture content and improves the grindability of the straw. On the other hand, it is easier to remove soil from the dried straw, improving the soil removal rate, and waste heat flue gas can be used for the flue gas, improving the energy utilization rate; 4. The aperture of each stage of sieve mesh of the integrated equipment of the present application can be adjusted according to process requirements, and the moisture content can be adjusted by adjusting the flue gas temperature and the roller speed, with wide applicability and flexible operation. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of a pulverizing system for round bales of corn straw for gasification according to an embodiment of the present application.

[0019] Figure 2 is Figure 1 a partial enlarged view of part A in

[0020] Description of the reference numerals: 1, double-shaft shredder; 2, drying, soil removal and impurity removal integrated equipment; 201, equipment support; 202, impurity removal box; 203, feed hopper; 204, primary drum screen; 205, secondary drum screen; 206, discharge hopper; 207, tertiary screen; 3, hammer mill; 4, pulverizer; 5, feeding belt; 6, first cyclone dust collector; 7, first bag filter; 8, material iron remover; 9, air inlet pipe; 10, hot flue gas source; 11, dust collection hood; 12, second cyclone dust collector; 13, second bag filter. Detailed Description of the Embodiment

[0021] The following will further describe the present application in detail Figure 1-2 with reference to the accompanying drawings.

[0022] The embodiment of the present application discloses a pulverizing system for round bales of corn straw for gasification. Referring to Figure 1 , it includes a double-shaft shredder 1, a drying, soil removal and impurity removal integrated equipment 2, a hammer mill 3 and a pulverizer 4. A feeding belt 5 is arranged on one side of the double-shaft shredder 1. The diameter of the round bales of corn straw is 1.2 - 1.4 m, the length of the round bales is 1.2 - 1.4 m, and the length of the straw is 30 - 50 cm. After manual unpacking, the straw is placed on the feeding belt 5 by a grass grabber and conveyed to the double-shaft shredder 1 for primary crushing to a particle size of < 5 cm. A feeding belt 5 is arranged between the double-shaft shredder 1 and the drying, soil removal and impurity removal integrated equipment 2, and the primary crushed material is conveyed to the drying, soil removal and impurity removal integrated equipment 2 through the feeding belt 5.

[0023] Refer to Figure 1 and Figure 2 As shown in FIGS. Figure 1 and Figure 2 , the integrated equipment 2 for drying, soil removal and impurity removal includes an equipment support 201, an impurity removal box 202, a feed hopper 203, a primary drum screen 204, a secondary drum screen 205 and a discharge hopper 206. The impurity removal box 202 is fixed on the equipment support 201. The feed hopper 203 is arranged on the side wall of the impurity removal box 202 for receiving the initially crushed material. The feed hopper 203 is connected to the primary drum screen 204. The secondary drum screen 205 is sleeved outside the primary drum screen 204. In this embodiment, the aperture of the primary drum screen 204 is 5 cm, and the aperture of the secondary drum screen 205 is 5 mm. During the rolling process of the material, large impurities such as stones, wood chips, and iron fall from the outlet of the primary drum screen 204, and the material smaller than 5 cm enters the secondary drum screen 205.

[0024] Refer to Figure 1 and Figure 2 As shown in FIGS. Figure 1 and Figure 2 , two tertiary filter screens are provided on the inner top wall of the impurity removal box 202. The aperture of the tertiary filter screen is 1 mm. A dust collection hood 11 is arranged outside each tertiary filter screen. The dust collection hood 11 is connected to a second cyclone dust collector 12 and a second bag filter 13. The soil in the straw is sucked by an induced draft fan through the air outlet of the dust collection hood 11 via the tertiary screen 207 into the subsequent second cyclone dust collector 12 and second bag filter 13 for dust removal. An air inlet pipe 9 is connected to the outer wall of the impurity removal box 202. The air inlet pipe 9 is connected to a hot flue gas source 10 with a flue gas temperature of 300 - 400 °C for drying the straw, reducing the moisture content, and improving the grindability of the straw.

[0025] Refer to Figure 1 and Figure 2 As shown in FIGS. Figure 1 and Figure 2 , the discharge hopper 206 is arranged at the bottom of the impurity removal box 202. A material iron remover 8 is arranged below the discharge hopper 206 to remove residual sundries such as residual iron wires and iron ingots. A feeding belt 5 is arranged between the integrated equipment 2 for drying, soil removal and impurity removal and the hammer mill 3. The material is transported to the hammer mill 3 through the feeding belt 5 for fine crushing to 5 mm. The hammer mill 3 is connected to a first cyclone dust collector 6 and a first bag filter 7. The finely crushed material is collected by the first cyclone dust collector 6 and the first bag filter 7 and then transported to the pulverizer 4. The finished powder material with a size of < 1 mm is obtained through the pulverizer 4 for use as the material for the subsequent gasifier.

[0026] The implementation principle of a pulverizing system for round bales of corn straw for gasification in an embodiment of this application is as follows: The diameter of the round bale of corn straw is 1.2 - 1.4 m, the length of the round bale is 1.2 - 1.4 m, and the length of the straw is 30 - 50 cm. After manual unpacking, the straw is placed on the feeding belt 5 by a hay grabber and transported to the double-shaft shredder 1 for primary crushing to a particle size < 5 cm. The primary crushed material is transported to the drying, soil-removing, and impurity-removing integrated equipment 2 through the feeding belt 5. During the rolling process of the material, large impurities such as stones, wood chips, and iron fall from the outlet of the first-stage drum screen 204. The material smaller than 5 cm enters the second-stage drum screen 205. The soil in the straw is sucked by the induced draft fan through the air outlet of the dust collection hood 11 through the third-stage screen 207 and enters the second cyclone dust collector 12 and the second bag dust collector 13 at the rear for dust removal. The outer wall of the impurity removal box 202 is connected to an air inlet pipe 9, and the air inlet pipe 9 is connected to a hot flue gas source 10 with a flue gas temperature of 300 - 400 °C for drying the straw, reducing the moisture content, and improving the grindability of the straw. The material electromagnetic separator 8 removes residual sundries such as iron wires and iron ingots, and is transported to the hammer mill 3 through the feeding belt 5 for fine crushing to 5 mm. The finely crushed material is collected by the first cyclone dust collector 6 and the first bag dust collector 7 and then transported to the pulverizer 4. The finished powder material < 1 mm is obtained through the pulverizer 4 and is used as the material for the gasifier at the rear end.

[0027] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A corn stalk round bag powder making system for gasification, characterized by: It includes a double-shaft shredder, an integrated drying and soil-removing and impurity-removing device, a hammer crusher and a grinding mill. Feeding belts are arranged between the double-shaft shredder and the integrated drying and soil-removing and impurity-removing device, and between the integrated drying and soil-removing and impurity-removing device and the hammer crusher. A first cyclone dust collector and a first bag dust collector are arranged between the hammer crusher and the grinding mill.

2. The corn stalk round bag powder making system for gasification according to claim 1, characterized in that: The integrated drying soil and impurity removal equipment includes an equipment support, an impurity removal box, a feed hopper, a primary drum screen, a secondary drum screen, a dust hood and a discharge hopper. The impurity removal box is arranged on the equipment support, the feed hopper is arranged on the outer wall of the impurity removal box, the primary drum screen and the secondary drum screen are both arranged inside the impurity removal box, the primary drum screen is connected to the feed hopper, the secondary drum screen is mounted on the outside of the primary drum screen, the top wall of the impurity removal box is provided with a three-stage screen, the dust hood is arranged outside the three-stage screen, and the discharge hopper is arranged at the bottom of the impurity removal box.

3. A corn stalk round bag powder making system for gasification according to claim 2, characterized in that: A material iron remover is arranged at one end of the discharge hopper away from the impurity removal box.

4. The corn stalk round bag powder making system for gasification according to claim 2, characterized in that: The side wall of the impurity removal box is provided with an air inlet pipe, and the air inlet pipe is connected to a hot flue gas source.

5. The corn stalk round bag powder making system for gasification according to claim 2, characterized in that: The dust hood is connected to a second cyclone dust collector and a second bag dust collector.

6. The corn stalk round bag powder making system for gasification according to claim 2, characterized in that: The aperture of the first-stage drum screen is 5 cm, the aperture of the second-stage drum screen is 5 mm, and the aperture of the third-stage screen is 1 mm.

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