CN215559916U - Coal injection type environment-friendly kiln - Google Patents

Abstract

The utility model belongs to the technical field of lime kilns, and discloses a coal injection type environment-friendly kiln which comprises a kiln body, wherein a filling area, a preheating area, a combustion area, a cooling area and a discharging area are sequentially arranged in the kiln body from top to bottom, the combustion area is provided with at least one group of coal injection combustion assemblies distributed along the circumferential direction of the inner wall of the kiln body, the feeding end of each coal injection combustion assembly is connected with the discharging end of a coal material flow divider, the feeding end of each coal material flow divider is connected with the discharging end of a pressurizing pump body, and the feeding end of each pressurizing pump body is connected with the discharging end of a coal material grinding device. The coal raw materials used for calcination can be crushed into powder, and then the powder is conveyed into the combustion area through the coal material splitter to be calcined, when limestone is calcined, because the coal fuel is powder, the contact surface between the limestone and air in the kiln body is larger, the limestone is more fully combusted, and the calcination efficiency can be higher through a plurality of coal injection guns distributed in the circumferential direction, so that the cost is reduced, the pollution to the environment is greatly reduced, and the environment-friendly and energy-saving effects are achieved.

Description

Coal injection type environment-friendly kiln

Technical Field

The utility model belongs to the technical field of lime kilns, and particularly relates to a coal injection type environment-friendly kiln.

Background

The steel industry, the calcium carbide industry, the alumina industry, the refractory material industry and the like are large lime consuming households, the industries are high-speed developing industries in two years, and the annual output is basically increased by more than 20%. The main material (auxiliary material) lime required by the lime kiln does not increase correspondingly, so that the tension of lime is caused, and the rapid development of the lime kiln technology is stimulated. The lime kiln generally adopts limestone and coal which are mixed and stacked in a kiln chamber of the lime kiln, and the surrounding limestone is burnt into quicklime by utilizing heat released in the coal burning process, so that the burning mode not only causes the problem of insufficient burning of the coal, but also causes more serious pollution to the ring.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem of insufficient combustion of coal fuel in the calcining process of the existing lime kiln, and provides a coal-injection type environment-friendly kiln.

The technical scheme adopted by the utility model is as follows:

a coal injection type environment-friendly kiln, which comprises a kiln body, wherein a combustion area, a cooling area and a discharging area are sequentially arranged in the kiln body from top to bottom,

the combustion area is provided with at least one group of coal injection combustion assemblies distributed along the circumferential direction of the inner wall of the kiln body, the feed end of each coal injection combustion assembly is connected with the discharge end of the coal material flow divider, the feed end of the coal material flow divider is connected with the discharge end of the pressurizing pump body, and the feed end of the pressurizing pump body is connected with the discharge end of the coal material grinding device.

In a preferred technical scheme, the coal injection combustion assembly comprises a plurality of coal injection guns distributed along the circumferential direction of the inner wall of the kiln body and igniters arranged on each coal injection gun, and the feed end of each coal injection gun is connected with a split-flow outlet of the coal splitter through a feed conveying pipe.

In the preferred technical scheme, two groups of coal injection combustion assemblies are arranged and distributed on the inner wall of the kiln body in an upper layer and a lower layer.

In the preferred technical scheme, the top in combustion area is equipped with the filler district, the filler district is equipped with filler mechanism, filler mechanism is including locating the outer material loading lifting machine of kiln body, locating the storage hopper of kiln body top and locating the internal rotatory distributing device of kiln, the feed end of rotatory distributing device with the storage hopper intercommunication.

In a preferred technical scheme, the feeding hoister is a bucket elevator or a belt feeder.

In the preferred technical scheme, a hydraulic ash discharging machine is arranged in the discharging area, and a receiving hopper of the hydraulic ash discharging machine faces upwards; and a discharging conveyor is arranged below a discharging port of the hydraulic ash discharging machine, and a material conveying end of the discharging conveyor extends out of the kiln body through an outlet of the discharging area.

In a preferable technical scheme, a discharge hole of the hydraulic ash discharger is provided with a hydraulic discharge gate valve.

In an optimal technical scheme, a dust removal pipeline and a denitration pipeline are respectively arranged at the top of the filler area, the dust removal pipeline is connected with an offline high-temperature bag-type dust remover, and the denitration pipeline is connected with a desulfurization and denitration device.

In a preferred technical scheme, the cooling area is provided with an air inlet pipe, and the air inlet pipe is connected with a fan.

In a preferable technical scheme, at least one group of combustion platforms formed by combustion beds or combustion beams are arranged below the coal injection combustion assembly in the combustion area.

The utility model has the beneficial effects that:

according to the utility model, by arranging the coal grinding device, the pressurizing pump bin, the coal splitter and the coal injection combustion assembly, the coal raw material used for calcination can be crushed into powder, and then the powder is conveyed to each coal injection gun of the coal injection combustion assembly through the coal splitter to enter the combustion area for calcination.

Meanwhile, the utility model also has the effects of convenient filling and discharging and being capable of treating waste gas.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

FIG. 3 is a schematic view of the structure of the insulation of the present invention.

In the figure: 1-a kiln body; 11-a packing zone; 111-a loading elevator; 112-a storage hopper; 113-a rotary distributor; 12-a preheating zone; 13-a combustion zone; 131-a coal injection gun; 132-a coal splitter; 133-a pressurized pump body; 134-a coal grinding device; 135-a combustion platform; 14-a cooling zone; 15-a discharge zone; 151-hydraulic ash hoist; 152-a discharge conveyor; 16-an insulating layer; 2-a desulfurization and denitrification device; 3-off-line high-temperature bag-type dust collector; 4-a fan.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the utility model is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the utility model is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be understood as limiting the present invention.

In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. For those skilled in the art, the drawings of the above-mentioned terms in the embodiments of the present invention can be understood in specific situations, and the technical solutions in the embodiments of the present invention are clearly and completely described. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

The utility model is further described with reference to the following figures and specific embodiments.

Referring to fig. 1 and 2, a coal injection type environment-friendly kiln comprises a kiln body 1, wherein a combustion area 13, a cooling area 14 and a discharging area 15 are sequentially arranged in the kiln body 1 from top to bottom; the combustion area 13 is provided with at least one group of coal injection combustion assemblies distributed along the circumferential direction of the inner wall of the kiln body 1, the feed end of the coal injection assembly is connected with the discharge end of the coal material splitter 132, the feed end of the coal material splitter 132 is connected with the discharge end of the pressurizing pump body 133, and the feed end of the pressurizing pump body 133 is connected with the discharge end of the coal material grinding device 134.

Wherein, coal injection combustion assembly lays along kiln body 1 inner wall circumference in combustion area 13 to can set up to multiunit and multiunit coal injection combustion assembly sets up in vertical layering. The coal splitter 132 is configured to split the pressurized pulverized coal fuel for respective delivery to the coal injection combustion assembly. The pressurizing pump 133 is used for extruding and conveying the coal fuel pulverized by the coal pulverizing device 134, and in a specific implementation process, the pressurizing pump 133 adopts a pressurizing pump bin for pressurizing. The coal pulverizing device 134 employs a roller pulverizing apparatus in the specific implementation process. In order to facilitate the control of the firepower, the firepower can be controlled by adjusting the pressurization of the pressurization pump bin.

Through setting up coal charge grinding device 134, the pressurization pump body, coal charge shunt 132 and coal powder injection combustion assembly, calcine used coal raw materials and can smash into powdered, then carry every coal powder injection rifle 131 that coal powder injection combustion assembly burns through coal charge shunt 132 and get into combustion area 13, when calcining the lime stone because coal fuel is powdered, make its interface with kiln body 1 internal air bigger, the burning is more abundant, and can make through a plurality of coal powder injection guns 131 that are circumference and distribute calcine efficiency higher, and then both the cost is reduced and greatly reduced the pollution to the environment, environmental protection and energy saving.

In particular implementations, each coal injection lance 131 is also equipped with a flashback arrestor. In order to monitor the temperature of the combustion area 13 to control the fire power of the burner, the calcination temperature of the limestone is 850-1200 ℃, and in a further embodiment, a temperature sensor is further disposed in the combustion area 13, and the temperature sensor is connected to the external monitoring device. It should be noted that there are a plurality of temperature sensors in the embodiment of the present invention, wherein each burner is equipped with a temperature sensor, and then a plurality of temperature sensors are respectively arranged at the top and the bottom of the combustion zone 13, so as to monitor the temperature of the combustion zone 13. It should be noted that the temperature sensor in the embodiment of the present invention is a conventional temperature sensor, such as a thermocouple, and the specific type and category are not limited.

In a preferred embodiment of the present invention, as shown in fig. 1, the coal injection combustion assembly comprises a plurality of coal injection guns 131 circumferentially distributed along the inner wall of the kiln body 1 and an igniter provided at each coal injection gun 131, and the feed end of each coal injection gun 131 is connected to a branch outlet of the coal splitter 132 through a feed delivery pipe. In the specific implementation process, 16 coal injection guns 131 of a group of coal injection combustion assemblies are arranged and distributed along the circumferential direction of the inner wall of the kiln body 1, and the feed end of each coal injection gun 131 is communicated with the split outlet of the coal splitter 132 through a feed delivery pipe. One side of the coal material flow divider 132 is provided with a feed inlet, the other side is provided with a plurality of flow dividing outlets, flow dividing channels communicated with the feed inlet are arranged in the coal material flow divider, and each flow dividing channel is communicated with one flow dividing outlet, so that the flow dividing output of the coal material is realized.

In a preferred embodiment of the present invention, as shown in fig. 1, two sets of coal injection combustion assemblies are provided and arranged in upper and lower layers on the inner wall of the kiln body 1. The coal combustion assemblies are arranged into two groups, so that the combustion efficiency of coal fuel can be further improved, and the calcination efficiency is further improved. Each group of coal injection combustion assemblies may be connected to one coal splitter 132, or may be connected to one coal splitter 132 at the same time, without limitation.

As shown in fig. 1, in a preferred embodiment of the present invention, a packing region 11 is disposed above the combustion region, the packing region 11 is provided with a packing mechanism, the packing mechanism comprises a feeding elevator 111 disposed outside the kiln body 1, a storage hopper 112 disposed above the kiln body 1, and a rotary distributor 113 disposed inside the kiln body 1, and a feeding end of the rotary distributor 113 is communicated with the storage hopper. The whole height of the kiln body 1 is high, so that the filling can be facilitated through the arrangement of the feeding hoister 111; the storage hopper 112 is used for temporary storage of the filler; a rotary distributor 113 is suspended in the top center of the filling area 11, and the rotary distributor 113 may also be a hydraulically driven distributor, but in the specific implementation process, the rotary distributor 113 is preferred.

As shown in fig. 1, in a preferred embodiment of the present invention, the feeding elevator 111 is a bucket elevator or a belt feeder. In the specific implementation process, a bucket elevator is adopted for feeding.

As shown in fig. 2, in a preferred embodiment of the present invention, a hydraulic ash discharger 151 is provided in the discharging area 15, and a receiving hopper of the hydraulic ash discharger 151 faces upward; a discharging conveyor 152 is arranged below a discharging port of the hydraulic ash discharging machine 151, and a conveying end of the discharging conveyor 152 extends out of the kiln body 1 through an outlet of the discharging area 15. The discharging conveyor 152 may be a belt feeder or a screw conveyor, and preferably adopts a screw conveyor in the specific implementation process.

In a preferred embodiment of the utility model, as shown in fig. 2, the discharge port of the hydraulic ash hoist 151 is provided with a hydraulic discharge gate valve. The hydraulic discharge gate valve is arranged at a discharge port of the hydraulic ash discharger 151, and the discharge gate valve realizes discharge through hydraulic drive.

As shown in fig. 1, in a preferred embodiment of the present invention, a dust removal pipe and a denitration pipe are respectively disposed at the top of the packing region 11, the dust removal pipe is connected to an off-line high temperature bag-type dust collector 3, and the denitration pipe is connected to a desulfurization and denitration device 2. Wherein, SOx/NOx control device 2 is specifically the desulfurizing tower to through the desulfurizing tower SOx/NOx control. Because the calcining temperature of the limestone is 850-2000 ℃, the temperature of the smoke gas generated in the calcining process is very high, and the off-line high-temperature bag-type dust collector 3 can bear the high temperature of the smoke gas.

In addition, in the specific implementation process, the furnace chamber denitration is matched, namely, the calcination temperature in the combustion zone reaches above 2000 ℃, when the nitrate is detected by the nitrate detection device, a denitration agent is injected into the combustion zone 13 for denitration, and the waste gas of the reaction is further treated by the desulfurization and denitration device and the off-line high-temperature bag-type dust remover.

In a preferred embodiment of the utility model, as shown in figure 2, the cooling zone 14 is provided with air inlet ducts to which the fan 4 is connected. This fan 4 is linked to each other and is cooled off district 14, and the air that gets into through this fan 4 can enough cool off the lime material that gets into cooling district 14 from combustion area 13, also can make the air improve for combustion area 13 and calcine used oxygen, also can be preheated when passing through the cooling chamber through the air that gets into in addition, and then the burning of 13 coal fuel in promotion combustion area that can be better to also play energy saving, cost-effective effect to a certain extent.

In a preferred embodiment of the present invention, as shown in fig. 1, the combustion zone 13 is provided with at least one set of combustion platforms 135 consisting of combustion beds or beams below the coal injection combustion assembly. In order to enable more complete calcination of limestone, the combustion platforms 135 are arranged in three layers with the coal injection combustion assembly in the combustion zone 13, and the combustion platforms 135 are located below the coal injection combustion assembly, by providing the combustion platforms 135 in the combustion zone 13. By adopting the combination of the combustion platform 135 and the coal injection combustion assembly, limestone can be more fully calcined, and the quality of lime is ensured. The combustion beam is an air-cooled combustion beam, namely a combustion beam cooled by wind.

In a preferred embodiment of the present invention, the present invention further comprises a control device, which is electrically connected to the pressure pump chamber, the igniter, the feeding elevator 111, the rotary distributor 113, the hydraulic ash discharger 151, the hydraulic discharge gate valve and the fan 4, respectively. The control device respectively controls the operation of the electric components. The control means may be a PLC controller.

In a preferred embodiment of the utility model, the storage hopper 112 is also provided with a weigher, which facilitates the filling according to the weight of the stock.

As shown in fig. 1, in a preferred embodiment of the present invention, the combustion area is further connected to a blower, an air outlet of the blower is connected to an air heater through an air outlet pipe, the air heater is communicated with the combustion area through a hot air pipe, secondary air supply to the combustion area can be realized through the blower, so as to promote calcination in the combustion area, and the temperature of the entering air can be increased through the arrangement of the air heater, so as to facilitate better calcination.

In a preferred embodiment of the utility model, as shown in fig. 3, an insulating layer 16 is provided on the inside of the kiln body 1. Because the kiln body 1 is used for calcining limestone and needs to resist high temperature, in order to enable the heat preservation layer 16 to better resist high temperature, in a further embodiment, the heat preservation layer 16 is a refractory brick heat preservation layer 16, and the thickness of the refractory brick heat preservation layer 16 is more than 1.45m, specifically 1.5m, so that the kiln body has a better heat preservation effect and can also be prevented from being burnt through.

It should be noted that the kiln body actually only has a combustion zone, a cooling zone and a discharge zone, while the filling zone 11 is only used for illustrating the filling mechanism provided therein, and the preheating zone 12 is subdivided into the preheating zone 12 due to the high level of the kiln body, which can heat the limestone material of the burden distribution, without limitation.

The preferred embodiment:

referring to fig. 1 and 2, the coal injection type environment-friendly kiln comprises a kiln body 1, wherein a filling area 11, a preheating area 12, a combustion area 13, a cooling area 14 and a discharging area 15 are sequentially arranged in the kiln body 1 from top to bottom; the combustion area 13 is provided with two groups of coal injection combustion assemblies distributed along the circumferential direction of the inner wall of the kiln body 1, the feed end of each coal injection assembly is connected with the discharge end of the coal material splitter 132, the feed end of the coal material splitter 132 is connected with the discharge end of the pressurizing pump bin, and the feed end of the pressurizing pump bin is connected with the discharge end of the roller type grinding equipment; each group of coal injection combustion assemblies comprises at least 12 coal injection guns 131 distributed along the circumferential direction of the inner wall of the kiln body 1 and an igniter arranged on each coal injection gun 131, and the feed end of each coal injection gun 131 is connected with one split outlet of the coal splitter 132 through a feed delivery pipe; the packing area 11 is provided with a packing mechanism, the packing mechanism comprises a bucket elevator arranged outside the kiln body 1, a storage hopper 112 arranged above the kiln body 1 and a hydraulic transmission rotary distributor 113 arranged in the kiln body 1, and the feeding end of the rotary distributor 113 is communicated with the storage hopper. A hydraulic ash discharger 151 is arranged in the discharging area 15, and a receiving hopper of the hydraulic ash discharger 151 faces upwards; a screw conveyor is arranged below the discharge hole of the hydraulic ash discharger 151, and the conveying end of the screw conveyor extends out of the kiln body 1 through the outlet of the discharge area 15. The discharge port of the hydraulic ash discharger 151 is provided with a hydraulic discharge gate valve. The top in filler district 11 is equipped with dust removal pipeline and denitration pipeline respectively, and dust removal pipe connection has off-line high temperature sack cleaner 3, and the denitration pipe connection has the desulfurizing tower. The cooling zone 14 is provided with an air inlet pipe which is connected with a fan 4. The combustion zone 13 is provided with a set of combustion platforms 135 formed by combustion beams below the coal injection combustion assembly. Still include the PLC controller, this PLC controller electric connection booster pump storehouse, some firearm, material loading lifting machine 111, rotatory distributing device 113, hydraulic pressure ash hoist 151, hydraulic pressure discharge gate valve and fan 4 respectively.

The implementation principle is as follows: limestone raw materials are fed into a storage hopper 112 through a bucket elevator, the raw materials in the storage hopper 112 enter a hydraulic transmission rotary distributor 113 through a feeding pipe, then the hydraulic transmission rotary distributor 113 distributes the materials in the kiln body 1, and the materials are stopped when the material distribution height on a combustion platform reaches 0.5m-1 m; meanwhile, coal raw materials are added to a feed port of the roller type grinding equipment, after the roller type grinding equipment grinds the coal raw materials into coal powder, coal powder fuel enters each coal injection gun 131 through a pressurizing pump bin and a coal material flow divider 132, and is injected out of the coal injection guns 131 and ignited by an igniter, so that the coal injection guns 131 inject out and start to burn, and limestone raw materials around the coal injection guns 131 are calcined; meanwhile, the temperature of the combustion area 13 is monitored through external monitoring equipment, and the firepower is controlled by regulating the pressurization size of the pressurization pump bin according to the temperature;

the calcined finished lime enters the cooling area 14 for cooling, and simultaneously, the material is distributed to the combustion area again to calcine new lime; the cooled finished lime is discharged from the discharge area 15 by a screw conveyor. In the calcining process, the desulfurization and denitrification device 2 and the dust removal device work simultaneously, so that air pollution is avoided.

The temperature detection adopts 16 groups of thermocouples, each group of thermocouples is respectively connected with a PLC controller, and the feeding and distribution are convenient to control according to the temperature detected by the thermocouples; the automatic feeding, distributing, discharging and the like can be conveniently realized through the PLC, so that higher automation degree is achieved.

The utility model is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.

Claims (10)

1. The utility model provides a coal injection formula environmental protection kiln, includes the kiln body (1), from the top down is equipped with combustion area (13), cooling space (14) and ejection of compact district (15) in proper order in the kiln body (1), its characterized in that:

the combustion area (13) is provided with at least one group of coal injection combustion assemblies distributed along the circumferential direction of the inner wall of the kiln body (1), the feed end of each coal injection combustion assembly is connected with the discharge end of the coal material splitter (132), the feed end of the coal material splitter (132) is connected with the discharge end of the pressurizing pump body (133), and the feed end of the pressurizing pump body (133) is connected with the discharge end of the coal material grinding device (134).

2. The coal injection type environment-friendly kiln as claimed in claim 1, wherein: the coal injection combustion assembly comprises a plurality of coal injection guns (131) distributed along the circumferential direction of the inner wall of the kiln body (1) and igniters arranged on each coal injection gun (131), and the feed end of each coal injection gun (131) is connected with a shunt outlet of the coal splitter (132) through a feed delivery pipe.

3. The coal injection type environment-friendly kiln as claimed in claim 2, wherein: the coal injection combustion assemblies are arranged in two groups and distributed in an upper layer and a lower layer on the inner wall of the kiln body (1).

4. The coal injection type environment-friendly kiln as claimed in claim 1, wherein: the top in combustion area is equipped with filler district (11), filler district (11) are equipped with the filler mechanism, the filler mechanism is including locating kiln body (1) outer material loading lifting machine (111), locating storage hopper (112) of kiln body (1) top and locating rotatory distributing device (113) in kiln body (1), the feed end of rotatory distributing device (113) with the storage hopper intercommunication.

5. The coal injection type environment-friendly kiln as claimed in claim 4, wherein: the feeding hoister (111) is a bucket elevator or a belt feeder.

6. The coal injection type environmentally friendly kiln as claimed in any one of claims 1 to 5, wherein: a hydraulic ash discharging machine (151) is arranged in the discharging area (15), and a receiving hopper of the hydraulic ash discharging machine (151) faces upwards; a discharging conveyor (152) is arranged below a discharging hole of the hydraulic ash discharging machine (151), and a conveying end of the discharging conveyor (152) extends out of the kiln body (1) through an outlet of the discharging area (15).

7. The coal injection type environment-friendly kiln as claimed in claim 6, wherein: and a discharge hole of the hydraulic ash discharger (151) is provided with a hydraulic discharge gate valve.

8. The coal injection type environment-friendly kiln as claimed in claim 4, wherein: the top in filler district (11) is equipped with dust removal pipeline and denitration pipeline respectively, the dust removal pipeline is connected with off-line high temperature sack cleaner (3), the denitration pipe connection has SOx/NOx control device (2).

9. The coal injection type environment-friendly kiln as claimed in claim 1, wherein: the cooling area (14) is provided with an air inlet pipe, and the air inlet pipe is connected with a fan (4).

10. The coal injection type environment-friendly kiln as claimed in claim 1, wherein: and at least one group of combustion platforms (135) consisting of combustion beds or combustion beams are arranged below the coal injection combustion assembly in the combustion area (13).

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