CN218931985U

CN218931985U - Straight-channel double-chamber lime kiln

Info

Publication number: CN218931985U
Application number: CN202223510210.4U
Authority: CN
Inventors: 曹和军; 程振鹏; 周丰
Original assignee: Shijiazhuang Shenghongda Thermal Engineering Technology Corp ltd
Current assignee: Shijiazhuang Shenghongda Thermal Engineering Technology Corp ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-04-28
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses a straight-channel double-chamber lime kiln, and belongs to the technical field of lime kilns; the device comprises two lime kiln bores, wherein the two lime kiln bores are of a vertical cylindrical structure and are arranged in parallel; the inner walls of the lime kilns are provided with refractory furnace linings; the middle lower parts of the two lime kiln bores are communicated through a straight channel; the straight channel is a hollow cylinder structure taking a metal framework as a main body; the two ends of the straight channel extend to the insides of the two lime kiln bores respectively, and the lower wall of the part of the straight channel positioned in the lime kiln bores is provided with vent holes. The utility model can improve the service life of the lining of the double-hearth lime kiln on the premise of ensuring the performance of the double-hearth lime kiln.

Description

Straight-channel double-chamber lime kiln

Technical Field

The utility model relates to the technical field of lime kilns, in particular to a straight-channel double-chamber lime kiln.

Background

The damage of furnace lining refractory material is concentrated in the annular high-temperature gas channel area, structural limitation exists in the bracket or suspension cylinder structure of the original design, namely, a large number of overhanging support refractory bricks are arranged in the high-temperature gas channel area, and although the high-temperature gas channel performance can be effectively realized, the expansion and contraction of the refractory bricks, refractory mud and castable caused by temperature change in the starting and stopping processes of the lime kiln have great influence on the structural strength of the overhanging support refractory material, after a period of use, the furnace lining loosens, brick joints become large, even bricks break and fall off, the phenomenon of gas mixing occurs in the high-temperature gas channel area, the external temperature of the kiln shell is high, the heat consumption of the lime kiln is increased, and the potential safety hazard of high-temperature scalding exists.

Disclosure of Invention

Aiming at the problems in the background technology, the utility model provides a straight-channel double-chamber lime kiln. The service life of the lining of the double-chamber lime kiln can be prolonged on the premise of guaranteeing the performance of the double-chamber lime kiln.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a straight-channel double-chamber lime kiln comprises two lime kiln chambers,

the two lime kiln bores are of a vertical cylindrical structure and are arranged in parallel; the inner walls of the lime kilns are provided with refractory furnace linings; the middle lower parts of the two lime kiln bores are communicated through a straight channel; the straight channel is a hollow cylinder structure taking a metal framework as a main body; the two ends of the straight channel extend to the insides of the two lime kiln bores respectively, and the lower wall of the part of the straight channel positioned in the lime kiln bores is provided with vent holes.

Further, the straight channel comprises a metal framework and a temperature-resistant heat-insulating protective layer; the heat-resistant heat-insulating protective layer is coated on the inner side and the outer side of the metal framework and forms a hollow cylinder structure.

Furthermore, the bottom of the lime kiln chamber is of a necking structure, and the tail end of the necking structure is provided with an ash outlet.

Furthermore, the top of the lime kiln chamber is of a necking structure and is used for collecting hot gas to improve the internal temperature.

Further, the top of the lime kiln chamber is provided with a flaring structure for holding more materials.

Further, a part of straight channel between two lime kiln bores is provided with an ignition burner for heating up at the top wall.

Further, the metal framework is a double-layer sleeve; the heat-resistant heat-insulating protective layer is respectively attached to the inner side of the inner sleeve and the outer side of the outer sleeve; the inlet and outlet of the channel formed between the two sleeves are connected with the inlet and outlet ends of the high-temperature cavity of the heat exchanger, the channel of the cooling medium between the two sleeves and the high-temperature cavity of the heat exchanger form closed circulation, the low-temperature cavity of the heat exchanger is cooled by low-temperature combustion-supporting air, and the heated combustion-supporting air is connected into the lime kiln through a combustion-supporting air pipeline.

Further, a cooling medium is communicated with the channel between the two sleeves, and the cooling medium is air, oil or water.

Further, the refractory lining is a straight-wall refractory lining which is clung to the inner wall of the lime kiln chamber.

The beneficial effects generated by adopting the technical scheme are as follows:

1. the utility model can communicate the waste gas of two kiln bores at the middle lower part of the kiln bores, and ensure the circulation of high-temperature gas between the two kiln bores; the method has the advantages that high-temperature gas in the kiln chamber stone pile uniformly circulates at multiple points on the cross section of the material, and the temperature difference of the cross section of the high-temperature gas is small.

2. The metal framework is cooled and protected in an air-cooled, oil-cooled or water-cooled mode, and heat energy led out by the cooling system is conveyed into the kiln by taking air as a carrier, so that the effect of effectively utilizing the heat energy of fuel is achieved.

3. The refractory material masonry layer of the kiln chamber has the advantages of simple structure, long service life of the same refractory material, long overhaul period of the refractory material masonry layer and high annual operation rate.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.

In the figure, 1, a lime kiln chamber A,2, a spray gun, 3, an ignition burner, 4, a straight channel, 5, a refractory lining, 6, an ash discharging system, 7, a lime kiln chamber B,8 and materials.

Detailed Description

The utility model will be further described with reference to the drawings and detailed description.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly described below, and it will be apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

A straight-channel double-chamber lime kiln comprises two lime kiln chambers,

Referring to fig. 1, the following is a more specific embodiment: the embodiment comprises two lime kiln bores, a limestone feeding system, a calcining system, a high-temperature gas straight channel system, a lime cooling ash discharging system, an electrometer hydraulic control system, a safety protection system and the like;

the two lime kiln bores are identical in configuration, the inner wall of each lime kiln bore is a quasi-rectangle formed by vertical cylinders and four sections of circular arcs, the lower section of the inner wall of each lime kiln bore is provided with a closing-in port, the upper section of the inner wall of each lime kiln bore is provided with a closing-in port or a flaring port, and the inner wall of each lime kiln bore is built by refractory materials without hanging or bracket support.

The middle lower part of the lime kiln bores is provided with a straight channel for communicating the two lime kiln bores, and the straight channel is used as a channel for reversing and circulating high-temperature gas at the middle lower part of the two lime kiln bores. The number of the straight channels is one or more sets according to the capacity of the lime kiln.

The straight channel arranged at the middle lower part of the lime kiln chamber is a hollow cylinder body taking a metal framework as a main body, the lower part of the straight channel main body is provided with a vent hole, the metal framework is subjected to cooling protection in an air cooling, oil cooling or water cooling mode, and heat energy led out by a cooling system is conveyed into the kiln by taking air as a carrier.

The two lime kiln bores are identical in configuration, the inner wall of the lime kiln bore is built by refractory materials without hanging or bracket support, and the influence of damage of bracket or hanging cylinder parts on the inner wall of the lime kiln bore on production can be eliminated by adopting a straight wall type refractory lining. The high-temperature waste gas straight channel is arranged at the middle lower part of the lime kiln chamber and is used for communicating the two kiln chambers and is used as a channel for reversing and circulating high-temperature gas at the middle lower part of the two kiln chambers.

And the fuel is alternately supplied to the two lime kiln bores and the limestone in the two kiln bores is calcined under the control of the hydraulic control system of the electrometer. Wherein the lime kiln chamber A and the lime kiln chamber B are communicated with each other at the bottom of the calcining zone through a high-temperature gas channel. When fuel is supplied to the lime kiln chamber A, the lime kiln chamber A is a calcination chamber, the lime kiln chamber B without fuel supply is a heat storage chamber, high-temperature gas formed by burning the lime kiln chamber A enters the lime kiln chamber B through a straight channel arranged at the middle lower part of the kiln chamber under the action of kiln pressure, and after the heat is absorbed by the material in the lime kiln chamber B, the temperature of the waste gas is reduced to about 150 ℃ and is discharged from the top of the lime kiln chamber B; after the lime kiln chamber A is calcined for a certain time (about 12 minutes), stopping the fuel supply of the lime kiln chamber A (if the fuel is coal gas, the coal gas is returned to the main pipe through the large backflow on the coal gas pipeline) when the combustion period is about 30 seconds, and purging all the fuel supply pipelines by using nitrogen to ensure the operation safety of the system; and stopping the supply of the combustion-supporting air and the lime cooling air, wherein the hydraulic three-way valve arranged on the combustion-supporting air and the lime cooling air pipeline is in a diffusing state under the control of the hydraulic system. After all reversing preparation operations are completed, fuel is supplied to a lime kiln chamber B, a combustion-supporting air inlet valve at the upper part of the lime kiln chamber A is closed, hydraulic three-way valves on combustion-supporting air and lime cooling air pipelines are in an air supply state to the kiln under the control of a hydraulic system, after all reversing operations are completed, the lime kiln chamber B is a calcination chamber, the lime kiln chamber A without fuel supply is a heat storage chamber, high-temperature gas formed by combustion of the lime kiln chamber B enters the lime kiln chamber A through a straight channel arranged at the middle lower part of the kiln chamber under the action of kiln pressure, after heat is absorbed by materials of the lime kiln chamber A, the temperature of waste gas is reduced to about 150 ℃ and is discharged from the top of the lime kiln chamber A; after the lime kiln chamber B is calcined for a certain time (about 12 minutes), the next cycle is started, the reversing operation is repeated, and the limestone is continuously calcined into active lime.

The above description is merely of individual embodiments of the present utility model, but the present utility model is not limited to these embodiments. Various equivalent modifications and substitutions may be made by those skilled in the art without departing from the spirit and principles of the present utility model, and these are intended to be included within the scope of the present utility model as defined in the appended claims.

Claims

1. A straight-channel double-chamber lime kiln is characterized by comprising two lime kiln chambers,

2. A straight channel double bore lime kiln according to claim 1, wherein the straight channel comprises a metal skeleton and a temperature resistant heat insulating protective layer; the heat-resistant heat-insulating protective layer is coated on the inner side and the outer side of the metal framework and forms a hollow cylinder structure.

3. A straight-channel double-hearth lime kiln according to claim 1, wherein the bottom of the lime kiln hearth is of a necking structure, and an ash outlet is arranged at the tail end of the necking structure.

4. The straight-channel double-hearth lime kiln according to claim 1, wherein the top of the lime kiln hearth is of a necking structure for collecting hot gas and increasing the internal temperature.

5. The straight-channel double-hearth lime kiln according to claim 1, wherein the top of the lime kiln hearth is of a flaring structure for containing more materials.

6. A straight-channel double-chamber lime kiln according to claim 1, characterized in that the part of the straight channel between the two lime kiln chambers has an ignition burner arranged on the top wall for heating.

7. A straight channel double bore lime kiln according to claim 2, wherein the metal skeleton is a double layered sleeve; the heat-resistant heat-insulating protective layer is respectively attached to the inner side of the inner sleeve and the outer side of the outer sleeve; the inlet and outlet of the channel formed between the two sleeves are connected with the inlet and outlet ends of the high-temperature cavity of the heat exchanger, the channel of the cooling medium between the two sleeves and the high-temperature cavity of the heat exchanger form closed circulation, the low-temperature cavity of the heat exchanger is cooled by low-temperature combustion-supporting air, and the heated combustion-supporting air is led into the lime kiln through the combustion-supporting air pipe.

8. A straight channel double bore lime kiln according to claim 7, wherein the channel between the two sleeves is filled with a cooling medium, which is air, oil or water.

9. The straight-channel double-hearth lime kiln according to claim 1, wherein the refractory lining is a straight-wall refractory lining which is closely attached to the inner wall of the lime kiln hearth.