CN114057412A

CN114057412A - Energy-saving lime kiln

Info

Publication number: CN114057412A
Application number: CN202111237058.4A
Authority: CN
Inventors: 林小元; 邓爱球
Original assignee: Huaihua Xin Feng Peak Calcium Industry Co ltd
Current assignee: Huaihua Xin Feng Peak Calcium Industry Co ltd
Priority date: 2021-10-24
Filing date: 2021-10-24
Publication date: 2022-02-18

Abstract

The invention discloses an energy-saving lime kiln, which comprises an inner ring body and an outer ring body, wherein a firing cavity is formed between the inner ring body and the outer ring body; the firing cavity sequentially forms a preheating zone, a firing zone and a cooling zone from top to bottom, and a combustion cavity is arranged in the inner ring body; a first fuel gas pipe and a second fuel gas pipe are introduced into the firing zone, the first fuel gas pipe and the second fuel gas pipe are respectively communicated with a heat storage device, and the heat storage devices are both communicated with a switching valve; one side of the switching valve is communicated with a gas inlet pipe, and the other side of the switching valve is communicated with a gas outlet pipe. The invention has simple structure and convenient use, can fully utilize the waste heat and can form a stirring effect on limestone, thereby saving energy and improving the energy utilization rate.

Description

Energy-saving lime kiln

Technical Field

The invention belongs to the field of lime processing, and particularly relates to an energy-saving lime kiln.

Background

Lime is an air-hardening inorganic gelling material with calcium oxide as a main component. The lime is a product with high calcium carbonate content such as limestone, dolomite, chalk, shells and the like, and is calcined at 900-1100 ℃. The existing lime kiln has less preheating utilization in waste gas during burning, which causes great waste of heat, and therefore needs to be improved.

Disclosure of Invention

In order to solve the problems, the invention discloses an energy-saving lime kiln. The invention has simple structure and convenient use, can fully utilize the waste heat and can form a stirring effect on limestone, thereby saving energy and improving the energy utilization rate.

In order to achieve the purpose, the technical scheme of the invention is as follows:

an energy-saving lime kiln comprises an inner ring body and an outer ring body, wherein a firing cavity is formed between the inner ring body and the outer ring body; the firing cavity sequentially forms a preheating zone, a firing zone and a cooling zone from top to bottom, and a combustion cavity is arranged in the inner ring body; a first fuel gas pipe and a second fuel gas pipe are introduced into the firing zone, the first fuel gas pipe and the second fuel gas pipe are respectively communicated with a heat storage device, and the heat storage devices are both communicated with a switching valve; one side of the switching valve is communicated with a gas inlet pipe, and the other side of the switching valve is communicated with a gas outlet pipe.

In a further improvement, the first fuel gas pipe and the second fuel gas pipe are sequentially communicated with a plurality of fuel gas nozzles from top to bottom.

In a further improvement, a plurality of discharging gates are fixed at the bottom of the firing cavity along the circumferential direction.

In a further improvement, the firing cavity is sequentially provided with a plurality of cross rods from top to bottom, and the orientation of the adjacent cross rods is different.

In a further improvement, a distributor is arranged at the top of the firing cavity.

In a further improvement, an air pump is arranged on the fuel gas inlet pipe.

In a further improvement, the heat storage device comprises a heat storage shell, and a porous heat storage body is arranged in the heat storage shell.

The invention has the advantages that:

the invention has simple structure and convenient use, can fully utilize the waste heat and can form a stirring effect on limestone, thereby saving energy and improving the energy utilization rate.

Description of the drawings:

FIG. 1 is a schematic flow chart of the present invention.

Detailed Description

The present invention is further illustrated by the following examples.

Example 1

An energy-saving lime kiln as shown in figure 1 comprises an inner ring body 1, an outer ring body 2, a burning cavity 3, a preheating zone 4, a burning zone 5, a cooling zone 6, a first fuel gas pipe 7, a second fuel gas pipe 8, a heat storage device 9, a heat storage shell 91, a porous heat storage body 92, a switching valve 10, a fuel gas inlet pipe 11, a fuel gas nozzle 12, a gate 13, a cross rod 14, a distributor 15, an air pump 16, a burning cavity 17 and an air outlet pipe 18.

A firing cavity 3 is formed between the inner ring body 1 and the outer ring body 2; the firing cavity 3 sequentially forms a preheating zone 4, a firing zone 5 and a cooling zone 6 from top to bottom, and a combustion cavity 17 is arranged in the inner ring body 1; the burning chamber 3 is provided with a plurality of cross bars 14 from top to bottom, and the orientation of the adjacent cross bars 14 is different. The top of the firing cavity 3 is provided with a distributor 15. A plurality of discharging gates 13 are fixed at the bottom of the firing cavity 3 along the circumferential direction.

The burning area 5 is introduced with a first fuel gas pipe 7 and a second fuel gas pipe 8, and the first fuel gas pipe 7 and the second fuel gas pipe 8 are respectively communicated with a heat storage device 9. The thermal storage device 9 includes a thermal storage case 91, and a porous thermal storage body 92 is installed in the thermal storage case 91.

The heat storage devices 9 are communicated with a switching valve 10; one side of the switching valve 10 is communicated with a gas inlet pipe 11, the other side is communicated with a gas outlet pipe 18, and the gas inlet pipe 11 is provided with a gas pump 16. The first gas pipe 7 and the second gas pipe 8 are sequentially communicated with a plurality of gas nozzles 12 from top to bottom.

The using method of the invention is as follows:

the distributor 15 adds the limestone which is crushed in advance into the burning chamber 3, then the gas is introduced into the burning chamber 17 for heating, the limestone is preheated through the preheating zone 4, then is burnt into lime at about 1000 ℃ through the burning zone 5, and is cooled gradually through the cooling zone 6, and the cooled lime flows out and the descending speed of the cooled lime is controlled through the opening degree of the gate 13. Limestone and lime pass through the horizontal pole 14 when whereabouts, are constantly separated by the horizontal pole, form the stirring effect to effectively prevent that the heat from too concentrating, thereby improve and fire the effect. The gas in the combustion chamber 17 firstly enters the combustion chamber 17 through the first heat storage device and the first gas pipe 7 for combustion, the combusted gas passes through the second combustion pipe and the second heat storage device, the second heat storage device absorbs heat therein, the gas overflows through the gas outlet pipe 18, the gas outlet pipe 18 is communicated with the cyclone separator to deposit dust therein, then the switching valve is switched, the gas absorbs heat through the second heat storage device and then enters the combustion chamber 17 through the second combustion pipe, and the heat of the gas is absorbed by the first heat storage device. If circulation is adopted, continuous heat absorption of the flue gas and continuous presetting of the fuel gas are realized, so that preheating in the flue gas is effectively utilized, and energy is saved.

While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the specification and the embodiments, which are fully applicable to various fields of endeavor for which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. An energy-saving lime kiln is characterized by comprising an inner ring body (1) and an outer ring body (2), wherein a firing cavity (3) is formed between the inner ring body (1) and the outer ring body (2); the firing cavity (3) sequentially forms a preheating zone (4), a firing zone (5) and a cooling zone (6) from top to bottom, and a combustion cavity (17) is arranged in the inner ring body (1); a first fuel gas pipe (7) and a second fuel gas pipe (8) are introduced into the firing area (5), the first fuel gas pipe (7) and the second fuel gas pipe (8) are respectively communicated with a heat storage device (9), and the heat storage devices (9) are both communicated with a switching valve (10); one side of the switching valve (10) is communicated with a gas inlet pipe (11), and the other side is communicated with an air outlet pipe (18).

2. The energy-saving lime kiln as claimed in claim 1, wherein the first gas pipe (7) and the second gas pipe (8) are sequentially communicated with a plurality of gas nozzles (12) from top to bottom.

3. An energy-saving lime kiln according to claim 1, characterized in that a number of discharge gates (13) are fixed circumferentially at the bottom of the firing chamber (3).

4. An energy-saving lime kiln according to claim 1, characterized in that the firing chamber (3) is provided with several bars (14) from top to bottom, adjacent bars (14) being oriented differently.

5. An energy-saving lime kiln according to claim 1, characterized in that a distributor (15) is installed at the top of the firing chamber (3).

6. An energy-saving lime kiln according to claim 1, characterized in that an air pump (16) is mounted on the gas inlet pipe (11).

7. An energy-saving lime kiln according to claim 1, characterized in that the heat storage device (9) comprises a heat storage housing (91), and a porous heat storage body (92) is installed in the heat storage housing (91).