阅读说明：本技术 一种核桃壳原煤掺烧的制粉系统 (Walnut shell raw coal blending combustion pulverizing system ) 是由 王曜 吴东垠 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种核桃壳原煤掺烧的制粉系统,包括生物质供应仓、称重装置、压力装置、文丘里管、生物质控制阀门、原煤仓、给煤器、中速磨煤机、生物质运输管道、煤粉管道和锅炉。生物质供应仓中的核桃壳经过称重装置进入压力装置进行研磨,核桃壳在压力装置中制成粉末后经过生物质运输管道通入煤粉管道与在中速磨煤机研磨的原煤煤粉混合,最后进入锅炉；实现了核桃壳原煤掺烧,降低了核桃壳粉末沿程对制粉系统的磨损,实现了核桃壳掺混比例可控制。本发明降低了维修成本,提高了制粉系统的安全性与灵活性。(The invention discloses a walnut shell raw coal blending combustion pulverizing system which comprises a biomass supply bin, a weighing device, a pressure device, a venturi tube, a biomass control valve, a raw coal bin, a coal feeder, a medium-speed coal mill, a biomass transportation pipeline, a pulverized coal pipeline and a boiler. Walnut shells in the biomass supply bin enter a pressure device through a weighing device to be ground, the walnut shells are made into powder in the pressure device, then the powder is introduced into a pulverized coal pipeline through a biomass transportation pipeline to be mixed with raw pulverized coal ground by a medium-speed coal mill, and finally the mixture enters a boiler; the raw coal blending combustion of the walnut shells is realized, the abrasion of the walnut shell powder to a pulverizing system along the process is reduced, and the blending proportion of the walnut shells can be controlled. The invention reduces the maintenance cost and improves the safety and the flexibility of the pulverizing system.)

1. A walnut shell raw coal blending burning pulverizing system is characterized in that: the device comprises a biomass supply bin (1), a weighing device (2), a descending drying pipe (3), a pressure device (4), a biomass conveying pipeline (5), a raw coal bin (6), a coal feeder (7), a medium-speed coal mill (8), a pulverized coal pipeline a (9), a pulverized coal pipeline b (10), a pulverized coal pipeline c (11), a pulverized coal pipeline d (12), a boiler (13), an air preheater (14), a primary air fan (15), a secondary air fan (16), a sealing air pipe (17), a cold primary air pipe (18), a hot primary air pipe (19), a cold secondary air pipe (20), a hot secondary air pipe (21), a wear-resistant material a (22), a wear-resistant material b (23), a wear-resistant material c (24), a wear-resistant material d (25), a wear-resistant material e (26), a wear-resistant material f (27), a Venturi tube (28) and a biomass control valve (29); the biomass supply bin (1) is communicated with the weighing device (2), the weighing device (2) is communicated with the pressure device (4), the pressure device (4) is communicated with the biomass transportation pipeline (5), the biomass transportation pipeline (5) is communicated with the pulverized coal pipeline a (9), the raw coal bin (6) is communicated with the coal feeder (7), the coal feeder (7) is communicated with the medium-speed coal mill (8), the medium-speed coal mill (8) is respectively communicated with the pulverized coal pipeline a (9), the pulverized coal pipeline b (10), the pulverized coal pipeline c (11) and the pulverized coal pipeline d (12), and the pulverized coal pipeline a (9), the pulverized coal pipeline b (10), the pulverized coal pipeline c (11) and the pulverized coal pipeline d (12) are communicated with the boiler (13).

2. The walnut shell raw coal co-fired pulverizing system of claim 1, which is characterized in that: and after the walnut shells are independently prepared into powder by the pressure device (4), the walnut shell powder is introduced into the coal powder pipeline a (9) through the biomass transportation pipeline (5) by using secondary air to be mixed with the raw coal powder and then is introduced into the boiler (13).

3. The walnut shell raw coal co-fired pulverizing system of claim 1, which is characterized in that: the biomass transportation pipeline (5) and the joint of the pulverized coal pipeline a (9) are provided with a Venturi tube (28), and a biomass control valve (29) is arranged between the pressure device (4) and the Venturi tube (28).

4. The walnut shell raw coal co-fired pulverizing system of claim 1, which is characterized in that: wear-resistant material a (22) and wear-resistant material b (23) are installed respectively to pressure device (4) exit elbow department, wear-resistant material c (24) are installed to living beings transportation pipeline (5) elbow department, wear-resistant material d (25) and wear-resistant material e (26) are installed respectively to buggy pipeline a (11) elbow department, buggy pipeline a (9) buggy spout department installs wear-resistant material f (27).

5. The walnut shell raw coal co-fired pulverizing system of claim 1, which is characterized in that: the secondary air fan (16) is respectively communicated with the cold secondary air pipe (20) and the hot secondary air pipe (21), the cold secondary air pipe (20) is communicated with the pressure device (4), and the hot secondary air pipe (21) is respectively communicated with the downlink drying pipe (3) and the boiler (13) through the air preheater (14).

Technical Field

The invention relates to the technical field of power plant coal pulverizing, in particular to a walnut shell raw coal co-fired coal pulverizing system.

Background

The biomass energy is used as a novel renewable energy source and has the characteristics of cleanness, safety, sustainability and the like. The biomass is various in types and wide in distribution, and the storage amount of agricultural and forestry waste is extremely high. The walnut shell is used as forestry waste widely distributed in northeast, has high heat value, effectively utilizes walnut shell resources, has important significance in researching and developing agriculture and forestry waste treatment technology, and is a feasible method for promoting the generation of electricity by blending raw coal with the walnut shell.

Meanwhile, compared with other biomass fuels, the cornification of the walnut shells can cause abrasion of the pulverizing system, so that a safe and economic pulverizing system for blending the raw coal of the walnut shells is urgently needed.

Disclosure of Invention

The invention solves the technical problem of providing a walnut shell raw coal co-fired pulverizing system, which can realize the reduction of abrasion while the walnut shell raw coal co-fired and realize the controllability of the co-fired ratio.

A walnut shell raw coal blending burning pulverizing system comprises a biomass supply bin 1, a weighing device 2, a descending drying pipe 3, a pressure device 4, a biomass transportation pipeline 5, a raw coal bin 6, a coal feeder 7, a medium-speed coal mill 8, a pulverized coal pipeline a9, a pulverized coal pipeline b10, a pulverized coal pipeline c11, a pulverized coal pipeline d12, a boiler 13, an air preheater 14, a primary air fan 15, a secondary air fan 16, a sealed air pipe 17, a cold primary air pipe 18, a hot primary air pipe 19, a cold secondary air pipe 20, a hot secondary air pipe 21, a wear-resistant material a22, a wear-resistant material b23, a wear-resistant material c24, a wear-resistant material d25, a wear-resistant material e26, a wear-resistant material f27, a Venturi tube 28 and a biomass control valve 29; the biomass supply bin 1 is communicated with the weighing device 2, the weighing device 2 is communicated with the pressure device 4, the pressure device 4 is communicated with the biomass transportation pipeline 5, the biomass transportation pipeline 5 is communicated with the pulverized coal pipeline a9, the raw coal bin 6 is communicated with the coal feeder 7, the coal feeder 7 is communicated with the medium-speed coal mill 8, the medium-speed coal mill 8 is respectively communicated with a pulverized coal pipeline a9, a pulverized coal pipeline b10, a pulverized coal pipeline c11 and a pulverized coal pipeline d12, and the pulverized coal pipeline a12, the pulverized coal pipeline b13, the pulverized coal pipeline c11 and the pulverized coal pipeline d12 are communicated with the boiler 13.

After the walnut shells are independently made into powder by the pressure device 4, the walnut shell powder is introduced into the coal powder pipeline a 11 through the biomass transportation pipeline 5 by secondary air to be mixed with the raw coal powder and then introduced into the boiler 13.

The biomass transportation pipeline 5 and the coal powder pipeline a9 are connected by a venturi tube 28, and a biomass control valve 29 is arranged between the pressure device 4 and the venturi tube 28.

Wear-resistant material a22 and wear-resistant material b23 are installed respectively to pressure device 4 exit elbow pipe department, 5 elbows in biomass transportation pipeline are installed wear-resistant material c24, wear-resistant material d25 and wear-resistant material e26 are installed respectively to buggy pipeline a9 elbow pipe department, buggy pipeline a9 buggy spout department is installed wear-resistant material f 27.

The secondary air fan 16 is respectively communicated with the cold secondary air pipe 20 and the hot secondary air pipe 21, the cold secondary air pipe 20 is communicated with the pressure device 4, and the hot secondary air pipe 21 is respectively communicated with the downlink drying pipe 3 and the boiler 13 through the air preheater 14.

The invention has the beneficial effects that:

the invention relates to a pulverizing system for blending and burning raw coal of walnut shells, which is characterized in that walnut shell powder is developed by using a pressure device, and the walnut shell powder is introduced into a coal powder pipeline by using secondary air to be mixed with the raw coal powder and then enters a boiler, so that blending and burning of the raw coal of the walnut shells are realized; wear-resistant materials are arranged at the positions easy to wear along the way, so that the wear of the walnut shell powder to pipelines and equipment is reduced; the walnut shell powder blending combustion amount can be freely adjusted according to requirements by utilizing the venturi tube and the biomass control valve.

Drawings

FIG. 1 is a schematic diagram of a pulverizing system of raw coal blending combustion of walnut shells according to the present invention.

Detailed Description

The invention is further described in detail below with reference to the drawings and the detailed description so that the advantages and features of the invention can be more easily understood by those skilled in the art, and the scope of the invention is more clearly and clearly defined.

The invention relates to a walnut shell raw coal blending combustion pulverizing system which comprises a biomass supply bin 1, a weighing device 2, a descending drying pipe 3, a pressure device 4, a biomass transportation pipeline 5, a raw coal bin 6, a coal feeder 7, a medium-speed coal mill 8, a pulverized coal pipeline a9, a pulverized coal pipeline b10, a pulverized coal pipeline c11, a pulverized coal pipeline d12, a boiler 13, an air preheater 14, a primary air fan 15, a secondary air fan 16, a sealing air pipe 17, a cold primary air pipe 18, a hot primary air pipe 19, a cold secondary air pipe 20, a hot secondary air pipe 21, an abrasion-resistant material a22, an abrasion-resistant material b23, an abrasion-resistant material c24, an abrasion-resistant material d25, an abrasion-resistant material e26, an abrasion-resistant material f27, a venturi tube 28 and a biomass control valve 29.

As a preferred embodiment of the present invention, as shown in fig. 1, a biomass supply bin 1 is communicated with a weighing device 2, the weighing device 2 is communicated with a pressure device 4, the pressure device 4 is communicated with a biomass transportation pipeline 5, the biomass transportation pipeline 5 is communicated with a pulverized coal pipeline a9, a raw coal bin 6 is communicated with a coal feeder 7, the coal feeder 7 is communicated with a medium-speed coal mill 8, the medium-speed coal mill 8 is respectively communicated with a pulverized coal pipeline a9, a pulverized coal pipeline b10, a pulverized coal pipeline c11 and a pulverized coal pipeline d12, the pulverized coal pipeline a9, the pulverized coal pipeline b10, the pulverized coal pipeline c11 and the pulverized coal pipeline d12 are communicated with a boiler 13, a primary air fan 15 is respectively communicated with a sealing air duct 17, a cold primary air duct 18 and a hot primary air duct 19, the sealing air duct 17 is communicated with the medium-speed coal mill 8, the hot primary air duct 19 is communicated with the coal mill 8 after being intersected through an air preheater 16 and the cold primary air duct 18, a secondary air fan 16 is respectively communicated with a cold secondary air duct 21, the cold secondary air pipe 20 is communicated with the pressure device 4, and the hot secondary air pipe 21 is respectively communicated with the descending drying pipe 3 and the boiler 13 after passing through the air preheater 16.

As shown in fig. 1, a venturi tube 28 is disposed at a connection position of the biomass transportation pipeline 5 and the pulverized coal pipeline a9, and a biomass control valve 29 is disposed between the pressure device 4 and the venturi tube 28.

As shown in fig. 1, an abrasion-resistant material a22 and an abrasion-resistant material b23 are respectively installed at the elbows of the inlet and the outlet of the pressure device 4, an abrasion-resistant material c24 is installed at the elbow of the biomass transportation pipeline 5, an abrasion-resistant material d25 and an abrasion-resistant material e26 are respectively installed at the elbow of the pulverized coal pipeline a9, and an abrasion-resistant material f27 is installed at the pulverized coal nozzle of the pulverized coal pipeline a 9.

As shown in figure 1, walnut shells in a biomass supply bin 1 enter a pressure device 4 through a weighing device 2, in order to reduce the influence of moisture in the walnut shells on the theoretical combustion temperature, a downlink drying tube 3 is arranged between the weighing device 2 and the pressure device 4, the walnut shells are dried by hot secondary air in the downlink drying tube 3 and then enter the pressure device 4, the walnut shells are ground into walnut shell powder in the pressure device 4 and then are introduced into a biomass transportation pipeline 5, the walnut shell powder is introduced into a coal powder pipeline a9 through the biomass transportation pipeline 5, a Venturi tube 28 is arranged on the biomass transportation pipeline 5, the flow of the walnut powder can be monitored, the mixing proportion can be adjusted by using a biomass control valve 29 according to needs, the biomass control valve 29 can be closed when not in use, and in order to reduce the abrasion of the walnut shell powder to a pipeline and equipment along the pipeline, wear-resistant materials a22, a wear-resistant material b is arranged at a position easy to wear, Raw coal in a raw coal bin 6 enters a medium-speed coal mill 8 through a coal feeder 7, the raw coal is ground into powder in the medium-speed coal mill 8 and then is respectively introduced into a pulverized coal pipeline a9, a pulverized coal pipeline b10, a pulverized coal pipeline c11 and a pulverized coal pipeline d12, and walnut shell powder and the raw coal powder are mixed in a pulverized coal pipeline a9 and finally enter a boiler 13.

In conclusion, the walnut shell powder is developed by using the pressure device, and is introduced into the coal powder pipeline by using secondary air to be mixed with the raw coal powder, and finally is introduced into the boiler; the wear-resistant materials are used at multiple positions along the process of the walnut shell powder, so that the wear of the walnut shell powder to the pipeline and equipment along the process is reduced; and the blending proportion of the walnut shell powder can be adjusted according to the requirement.