CN211111740U

CN211111740U - Double-chamber lime kiln

Info

Publication number: CN211111740U
Application number: CN201921658935.3U
Authority: CN
Inventors: 贾会平
Original assignee: Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
Current assignee: Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-07-28
Anticipated expiration: 2029-09-30

Abstract

The utility model relates to a double-chamber limekiln, which comprises a kiln body, a material distribution system, an ash discharge device, a fuel system, an air supply system and a waste gas discharge system. The upper part in the kiln body is provided with a flue gas outlet and a secondary air inlet, and the flue gas outlet is connected with a waste gas discharge system. The kiln body is divided into a preheating zone, a calcining zone and a cooling zone, the preheating zone is provided with an inserted burner, and the lower part of the cooling zone is provided with a cooling air inlet. The middle of the kiln body is provided with a partition wall which divides the kiln chamber into two spaces. The lower part of partition wall is equipped with 1 ~ 10 gas mouths, and the gas mouth is located between calcining area and the cooling zone, communicates each other through two spaces of gas mouth. The utility model discloses a building the partition wall by laying bricks or stones in the kiln is internal, divide into two cavitys with the kiln thorax, form two thorax limekilns, replace the burning roof beam with the nozzle, solved the unable blue charcoal of use of beam type limekiln and as the problem of fuel, be favorable to improving the environmental protection performance of limekiln.

Description

Double-chamber lime kiln

Technical Field

The utility model belongs to the technical field of chemical building materials production facility, a industrial furnace is related to, concretely relates to two thorax kilns.

Background

The beam lime kiln is a common technology for lime production, has the advantages of low energy consumption, good quality of lime products, strong production capacity, large operation elasticity and the like, and is widely applied to the lime production for metallurgy, chemical engineering and other purposes. The burning beam is the core equipment of the beam type lime kiln, and the limestone is calcined through the burning beam. In general, calcination requires burning fuel in a calcining zone, and the heat released is used for heating the calcined material. The decomposition temperature of the limestone is about 900 ℃, and the calcining temperature is generally 1000-1200 ℃. To reach the calcination temperature, a fuel with a certain calorific value is required to produce qualified lime. The beam lime kiln is mostly a gas-fired lime kiln, and natural gas, liquefied petroleum gas, coke oven gas, blast furnace gas and calcium carbide furnace gas are used as fuels. Due to the limitation of fuel resources, gas-fired lime kilns cannot be used in some places to produce lime.

The solid fuel for burning the lime for the burning beam in the beam-type lime kiln is limited by the process, and the burning effect is not ideal. Compared with the coke product in general meaning, the semi coke has the advantages of high fixed carbon, high specific resistance, high chemical activity, low ash content, low sulfur, low phosphorus, low moisture and the like, and is widely used in industries such as chemical industry, smelting and the like by gradually replacing the coke under the large background of environmental management, pollution reduction, energy conservation and consumption reduction. In order to meet the requirements of energy conservation and environmental protection, the beam-type lime kiln needs to be modified, so that the modified lime kiln can use semi coke as fuel.

SUMMERY OF THE UTILITY MODEL

The application aims at providing a double-chamber lime kiln, uses solid fuel to calcine, and the lime is calcined in the limited area of adaptation gaseous fuel, satisfies energy-concerving and environment-protective requirement, especially is applicable to rebuilding on current lime kiln basis, and the current resource of make full use of saves the construction investment, increases enterprise economic benefits.

The utility model discloses two thorax limekilns, including the kiln body, cloth system, ash discharging device, fuel system, air feed system and exhaust emission system. The upper part in the kiln body is provided with a flue gas outlet and a secondary air inlet, and the flue gas outlet is connected with a waste gas discharge system. The kiln body is divided into a preheating zone, a calcining zone and a cooling zone, the preheating zone is provided with an inserted burner, and the lower part of the cooling zone is provided with a cooling air inlet. The middle of the kiln body is provided with a partition wall which divides the kiln chamber into two spaces. The lower part of partition wall is equipped with 1 ~ 10 gas mouths, and the gas mouth is located between calcining area and the cooling zone, communicates each other through two spaces of gas mouth.

The partition wall is of a solid refractory brick masonry structure or a steel frame structure arranged in the middle, and a cooling air channel is arranged in the partition wall. The inserted burner is a solid fuel burner, a liquid fuel burner or a gas fuel burner. The solid fuel burner is made of blue carbon powder, coke powder or coal powder. The double-chamber kiln is used for newly building the double-chamber kiln and reconstructing the existing lime kiln, and the existing lime kiln comprises a beam type lime kiln.

The utility model discloses two thorax limekilns are through building by laying bricks or stones the partition wall in the kiln body, divide into two cavitys with the kiln thorax and form two thorax limekilns, replace the burning roof beam with the nozzle, solved the unable blue charcoal of use of beam type limekiln and as the problem of fuel, be favorable to improving the environmental protection performance of limekiln. The double-hearth kiln also has heat storage capacity, and because two hearths are formed by using the partition wall, the two hearths can be alternately calcined and preheated, and part of combustion air is preheated by using the heat storage, so that the double-hearth kiln has the thermal characteristics of cocurrent calcination and countercurrent heat storage, and the thermal efficiency of the lime kiln is improved. The utility model discloses be particularly useful for the reconstruction of current lime kiln, make full use of has the resource to save the construction investment, increases enterprise economic benefits.

Drawings

FIG. 1 is a schematic structural view of a double-chamber lime kiln provided by the present invention;

FIG. 2 is a side view of the double-chamber lime kiln provided by the present invention;

Fig. 3 is a top view of the double-chamber lime kiln provided by the utility model.

The device comprises a flue gas outlet 1, a secondary air inlet 2, a cooling air channel 3, a kiln body 4, a partition wall 5, a flue gas port 6, a cooling air inlet 7, an ash storage bucket 8, a material distribution system 9, a preheating zone 10, a burner 11, a calcining zone 12, a cooling zone 13, an ash discharging device 14, an ash discharging belt conveyor 15, a kiln shell 16, a kiln chamber 17 and a masonry structure 18.

Detailed Description

The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.

The embodiment is reconstructed on the basis of the existing beam type lime kiln, and the combustion beam, the suction beam and the supporting facilities of the existing beam type lime kiln are dismantled. The double-chamber lime kiln of the utility model is shown in figure 1 and figure 2, and comprises a kiln body 4, a material distribution system 9, an ash discharge device 14, a fuel system, an air supply system and a waste gas discharge system. The upper part in the kiln body is provided with a flue gas outlet 1 and a secondary air inlet 2, the flue gas outlet is connected with a waste gas discharge system, and the secondary air inlet 2 is connected with an air supply system. The kiln body is divided into a preheating zone 10, a calcining zone 12 and a cooling zone 13, the preheating zone is provided with an inserted burner 11, and the inserted burner is a solid fuel burner. The plug-in burner is connected with a fuel system, and the fuel system sends the semi-coke powder fuel to the plug-in burner 11 by blowing air of a Ross blower. The lower part of the cooling zone is provided with a cooling air inlet 7, and the cooling air inlet 7 is connected with a cooling fan. As shown in fig. 3, the kiln body comprises a kiln shell 16, a masonry structure 18 and a kiln chamber 17, and a partition wall 5 is positioned in the middle of the kiln chamber to divide the kiln chamber into two spaces. The lower part of partition wall is equipped with 3 gas outlets 6, and the gas outlet is located between calcining zone and the cooling zone, communicates each other through two spaces of gas outlet. The partition wall 5 is built by refractory bricks, the middle of the partition wall is of a steel structure, a cooling air channel 3 is arranged in the partition wall and is connected with a cooling fan, and the cooling air channel is introduced into the kiln chamber and used for supplementing secondary air.

The utility model discloses the operation process of two thorax limekilns does, both sides thorax sharing cloth system, calcine and preheat the material in turn, the lime stone raw materials gets into the thorax 17 of both sides respectively through the cloth system, blue carbon powder carries the bayonet nozzle 11 of one side through fuel system wind-force, spout on the lime stone of calcining the area, the air is done to the delivery wind, and send into the overgrate air from the top, the fuel burns the lime stone at the calcining area, the lime after calcining falls to the cooling zone, send into the cooling air by the cooling air entry and cool off, lime after the cooling is through going out grey device 14 and going out grey belt feeder 15 output. The flue gas after calcining the material is delivered to the kiln chamber at the other side together with cooling air through a flue gas port, the fresh limestone material entering the kiln chamber is preheated, and the flue gas after preheating the limestone is delivered to a waste gas discharge system through a flue gas outlet 1 to be discharged. The alternative calcining and preheating processes are automatically switched by the actions of a valve and a three-way valve according to time intervals.

And a denitration device is allowed to be added at the flue gas port and the inserted burner so as to reduce the emission of nitrogen oxides in the flue gas.

Claims

1. A double-chamber lime kiln comprises a kiln body (4), a distribution system (9), an ash discharge device (14), a fuel system, an air supply system and a waste gas discharge system, wherein a flue gas outlet (1) and a secondary air inlet (2) are formed in the upper part in the kiln body, and the flue gas outlet is connected with the waste gas discharge system; the kiln is internal to be divided into preheating zone (10), calcining zone (12) and cooling zone (13), the preheating zone is equipped with bayonet nozzle (11), the lower part of cooling zone is equipped with cooling air entry (7), characterized by: a partition wall (5) is arranged in the middle of the kiln body (4) to divide the kiln chamber into two spaces; the lower part of partition wall is equipped with at least one gas port (6), the gas port is located between calcining zone and the cooling zone, communicates each other through two spaces of gas port (6).

2. The dual-bore lime kiln of claim 1, wherein: the partition wall (5) is of a solid refractory brick masonry structure or a structure with a steel frame in the middle, and a cooling air channel (3) is arranged in the partition wall.

3. The dual-bore lime kiln of claim 1, wherein: the inserted burner (11) is a solid fuel burner, a liquid fuel burner and a gas fuel burner or the mixture of the solid fuel burner, the liquid fuel burner and the gas fuel burner.

4. The dual-bore lime kiln of claim 3, wherein: and the solid fuel burner is made of blue carbon powder, coke powder or coal powder.

5. The dual-bore lime kiln of claim 3, wherein: the double-hearth kiln is used for newly building the double-hearth kiln and rebuilding an existing lime kiln, and the existing lime kiln comprises but is not limited to a beam lime kiln.

6. The dual-bore lime kiln of claim 1, wherein: denitration devices are added at the flue gas port and the inserted burner so as to reduce the emission of nitrogen oxides in the flue gas.