CN212246784U

CN212246784U - Double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln

Info

Publication number: CN212246784U
Application number: CN202021897074.7U
Authority: CN
Inventors: 吴波; 张玉宝; 杨艳
Original assignee: Shandong Wanfang Kiln Engineering Technology Co ltd
Current assignee: Shandong Wanfang Kiln Engineering Technology Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2020-12-29
Anticipated expiration: 2030-09-02

Abstract

A double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln comprises two kiln bodies, wherein the chambers of the two kiln bodies are communicated; each kiln body is composed of a shell and a refractory kiln lining built on the inner wall of the shell, a cavity in the middle of the kiln lining is a kiln chamber, the cross section of the kiln chamber is rectangular, the kiln chamber is sequentially divided into a preheating zone, a calcining zone and a cooling zone from top to bottom, a fuel spray gun, a combustion air inlet pipe and a flue gas discharge pipe are arranged in the preheating zone, a cooling air supply pipe and a connecting channel penetrating through the kiln chambers in the two kiln bodies are arranged in the cooling zone, and ignition and drying burners are arranged in the connecting channel. The outer side of the kiln body is provided with a limestone feeding device, and the bottom of the kiln body is provided with an ash discharging device. The utility model discloses a rectangular cross section kiln thorax, kiln lining brick type is simple, and the installation maintenance is convenient, when designing the high-capacity limekiln, only needs to extend the long limit of rectangle just can increase output, and the minor face of rectangle is unchangeable, and fuel spray gun's arrangement structure is unchangeable.

Description

Double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln

Technical Field

The utility model relates to a device for calcining limestone to generate quick lime, which belongs to the technical field of lime firing devices.

Background

The lime is generated by calcining limestone, and the traditional production process is that limestone and fuel are put into a lime kiln (gas fuel is sent in through a pipeline and a burner) for preheating, then decomposition is started when the temperature is 850 ℃, calcination is completed when the temperature is 1200 ℃, and then the lime is discharged out of the kiln after cooling. The lime kiln mainly comprises a kiln body, a feeding device, a distributing device, a combustion device, an ash discharging device, a dust removing device, an electric control device and the like, and is most commonly applied to a shaft kiln. The utilization coefficient of the common shaft kiln is below 50 percent, the energy consumption is high, and the production efficiency is low.

At the initial stage of limestone calcination, the limestone absorbs a large amount of heat, the absorbed heat is gradually reduced along with the continuous decomposition and downward movement of the limestone, and at the end of the calcination, the heat supply amount must be greatly reduced in order to avoid the overburning of the lime, so that if the limestone moving direction and the flame combustion direction are in parallel flow (namely in the same direction), the calcination of high-quality lime is facilitated, and the parallel flow type lime shaft kiln for limestone calcination is realized by adopting the alternate combustion and smoke exhaust of two kiln chambers, namely the heat accumulating type double kiln chambers.

At present, the sections of the chambers of the heat accumulating type double-chamber concurrent flow lime shaft kiln are two circular Macerz kilns, and the sections of the chambers of the heat accumulating type double-chamber concurrent flow lime shaft kiln are also two semicircular double-D kilns. Along with the continuous expansion of the tonnage of the lime kiln, the radius of the kiln chamber is not short and is not increased, the connecting channel is gradually lengthened, the problem of ash accumulation of the channel is also highlighted, and meanwhile, along with the increase of the radius of the kiln chamber, certain difficulty is brought to the arrangement and installation of the fuel spray gun.

SUMMERY OF THE UTILITY MODEL

To the not enough of current two thorax parallel flow lime shaft kilns of heat accumulation formula technique existence, the utility model provides an easily realize big output, convenient, the two rectangle thorax heat accumulation parallel flow lime shaft kilns of kiln type simple structure of fuel spray gun installation.

The utility model discloses a two rectangle thorax heat accumulation parallel flow lime shaft kilns adopts following technical scheme:

the lime shaft kiln comprises two kiln bodies, wherein the kiln chambers of the two kiln bodies are communicated; each kiln body is composed of a shell and a refractory kiln lining built on the inner wall of the shell, a cavity in the middle of the kiln lining is a kiln chamber, the cross section of the kiln chamber is rectangular, the kiln chamber is sequentially divided into a preheating zone, a calcining zone and a cooling zone from top to bottom, a fuel spray gun, a combustion air inlet pipe and a flue gas discharge pipe are arranged in the preheating zone, a cooling air supply pipe and a connecting channel penetrating through the kiln chambers in the two kiln bodies are arranged in the cooling zone, and ignition and drying burners are arranged in the connecting channel.

The utility model discloses a lime kiln, including kiln body, kiln body outside sets up lime stone feedway, this lime stone feedway includes kiln crown feed bin, unloading valve, distributing device, loading truck, material loading guide rail and hoist engine, kiln crown feed bin sets up the top at two kiln bodies, the bottom of kiln crown feed bin sets up two unloading valves, a distributing device is connected to every unloading valve, two distributing devices set up respectively at the top of two kiln bodies, the material loading guide rail sets up on the outer wall of one of them kiln body, the loading truck sets up on the material loading guide rail and is connected with the hoist engine.

Kiln body bottom sets up out grey device, and this ash device includes single kiln ash hoist, single kiln finished product ash storehouse, single kiln discharge valve, assembly finished product ash storehouse and total ash hoist, and the bottom of every kiln body sets up one set of single kiln ash hoist, single kiln finished product ash storehouse and the single kiln discharge valve that connects gradually, and the single kiln discharge valve is connected to assembly finished product ash storehouse, and assembly finished product ash storehouse is connected total ash hoist.

The kiln chamber is in a straight cylinder shape from top to bottom, and the rectangular cross section of the kiln chamber is 5-8 meters in length and 2-3 meters in width. Four corners of the rectangular cross section of the kiln chamber are provided with transition arcs, and the radius of the arcs is 0.4-0.6 m.

The fuel spray guns are uniformly arranged on the inner wall of the kiln chamber at the upper part of the preheating zone.

The lower part of the combustion-supporting air inlet pipe is connected to the connecting channel, the upper part of the combustion-supporting air inlet pipe is connected with the combustion-supporting fan, on the one hand, the combustion-supporting air inlet pipe is connected with a flue gas discharge pipe (one reversing valve corresponds to one kiln body) through two parallel reversing valves, on the other hand, the flue gas discharge pipe is connected with a dust remover, and the dust remover is connected to a chimney.

The utility model discloses a rectangular cross section kiln thorax structure, when designing the high-capacity limekiln, only need to increase output with the long limit extension of rectangle, and the minor face of rectangle is unchangeable, and the arrangement structure of fuel spray gun is unchangeable. Because the kiln lining adopts a rectangular structure and is in a straight cylinder shape from top to bottom, the kiln lining brick is simple in shape, and the installation and the maintenance are simple and convenient.

Drawings

FIG. 1 is a schematic structural diagram of the double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln of the present invention.

Fig. 2 is a sectional view of a rectangular kiln chamber in the middle kiln body of the utility model.

In the figure: 1. kiln top bin, 2, blanking valve, 3, reversing valve, 4, fuel spray gun, 5, kiln lining, 6, steel plate shell, 7, connecting channel, 8, single kiln ash discharger, 9, single kiln finished product ash bin, 10, single kiln discharge valve, 11, assembly product ash bin, 12, total ash discharger, 13, loading vehicle, 14, windlass, 15, chimney, 16, dust remover, 17, flue gas discharge pipe, 18, distributor, 19, combustion air inlet pipe, 20, ignition and baking furnace burner, 21, cooling fan, 22, combustion fan, 23, loading track, 24 and cooling air supply pipe.

Detailed Description

The utility model discloses an overall structure of two rectangle thorax heat accumulation cocurrent flow lime shaft kilns is shown in figure 1, and whole lime kiln includes the kiln body (A and B), the ash discharging device of lime stone feedway, two kiln thorax intercommunications and the burning of kiln body coupling parts such as discharge fume. The kiln chambers of the two kiln bodies are communicated through a connecting channel 7.

The limestone feeding device comprises a kiln top bin 1, a discharging valve 2, a distributor 18, a feeding vehicle 13, a feeding guide rail 23 and a winch 14. Kiln top feed bin 1 sets up the top at two kiln bodies of A and B, and kiln top feed bin 1's bottom sets up two unloading valves, and every unloading valve connects a distributing device, and a distributing device corresponds a kiln body, sets up the top at the kiln body. The feeding guide rail 23 is arranged on the outer wall of one of the kiln bodies (A kiln body or B kiln body), and the top end of the feeding guide rail is higher than the kiln top bin 1. The feeding trolley 13 is arranged on the feeding guide rail 23 and connected with the winch 14, the feeding trolley 13 filled with limestone ascends along the feeding guide rail 23 under the driving of the winch 14 and pours the limestone into the kiln top bin 1, and the empty feeding trolley 13 is driven by the winch 14 to return.

The kiln body comprises a steel-structured shell 6 and a kiln liner 5, wherein the kiln liner 5 is formed by building refractory materials on the inner wall of the shell 6 and is a refractory kiln liner. Fig. 2 shows the cross-sectional structure of the kiln body. The cavity in the middle of the kiln liner 5 is a kiln chamber and is used for calcining limestone and is a lime accommodating space. The kiln chamber (cavity) is in a straight cylinder shape, the cross section of the kiln chamber (cavity) is rectangular, the length of the rectangle is 5-8 meters, and the width of the rectangle is 2-3 meters; four corners of the rectangle are provided with transition arcs, and the radius of the arcs is 0.4-0.6 m. The setting of the parameters has important significance for the strength of the kiln body, the containing and the descending of materials and is obtained on the basis of comprehensive experiments.

The kiln chamber is divided into a preheating zone, a calcining zone and a cooling zone from top to bottom in sequence. The upper part of the preheating zone is provided with a fuel spray gun 4, a combustion air inlet pipe 19 and a flue gas discharge pipe 17, the fuel spray guns 4 are uniformly arranged on the inner wall of the kiln chamber at the upper part of the preheating zone, the lower part of the combustion air inlet pipe 19 is connected to the connecting channel 7, the upper part of the combustion air inlet pipe is connected with a combustion fan 22 on one hand, on the other hand, the combustion air inlet pipe is connected with the flue gas discharge pipe 17 through two parallel reversing valves 3, the flue gas discharge pipe 17 is connected with a dust remover 16, the dust remover 16 is connected to a chimney 15, and one. The upper part of the cooling zone is provided with a connecting channel 7 which runs through the kiln chambers in the two kiln bodies, so that the gas in the two kiln chambers is communicated. The connecting channel 7 is made of refractory material, and an ignition and baking furnace burner 20 is arranged on the side wall of the channel 7. The lower part of the cooling belt is provided with a cooling air supply pipe 24 connected with a cooling fan 21, the cooling air supply pipe 24 enters the kiln chamber through a connecting channel 7, and the lower part of the cooling belt (the outlet at the bottom of the kiln body) is connected with an ash discharging device.

The ash discharging device comprises a single-kiln ash discharging machine 8, a single-kiln finished product ash bin 9, a single-kiln discharging valve 10, an assembly ash bin 11 and a total ash discharging machine 12. The bottom of each kiln body is provided with a set of single-kiln ash discharger 8, a single-kiln finished product ash bin 9 and a single-kiln discharge valve 10 which are connected in sequence. The single-kiln ash discharger 8 adopts a supporting plate type ash discharger. The single-kiln discharge valve 10 is connected to an assembly ash bin 11, and the assembly ash bin 11 is connected with a main ash discharger 12.

The operation of the lime shaft kiln described above is as follows.

The feeding car 13 for storing the limestone is driven by the winch 14 to be conveyed to the kiln top bin 1, and the limestone is uniformly thrown into the kiln chambers of the kiln A body and the kiln B body of the lime shaft kiln through the distributor 18 by opening the discharging valve 2. The kiln A and the kiln B alternately run.

When the kiln body A is calcined, a fuel spray gun 4 in the kiln body A is in a fuel supply state, a reversing valve 3 is in an air connection state, combustion-supporting air provided by a combustion-supporting fan 22 enters the kiln body A through a combustion-supporting air inlet pipe 19 and is ignited by an ignition and baking burner 20 arranged in a connecting channel 7, the kiln body A is combusted at the moment to realize a calcining function, waste gas generated by combustion and limestone decomposition enters the kiln body B through the connecting channel 7, the reversing valve 3 of the kiln body B is in a smoke connection state at the moment, and the waste gas enters a smoke discharge pipe 17, a dust remover 16 and a chimney 15 through the kiln body B and a smoke channel of the reversing valve 3 to be discharged, so that the heat storage function of the kiln body B is realized. After a certain time, the function conversion of the kiln body A and the kiln body B is realized through the reversing of the reversing valve 3, the kiln body B is converted into a calcining function, and the kiln body A is converted into a heat storage function. Therefore, the kiln A and the kiln B are separated by a certain time, the calcination and heat storage functions are repeatedly converted, the limestone is continuously calcined, and the waste heat of the waste gas is recycled, so that the high-efficiency calcination of the double-hearth limestone is realized.

The calcined limestone respectively enters a middle finished product ash bin 9 of each single kiln through a single kiln ash discharging machine 8 at the lower part of the kiln A and the kiln B, then enters an assembly finished product ash bin 11 through a discharge valve 10 of each single kiln, and finally is discharged out of the lime shaft kiln through a total ash discharging machine 12.

The cooling of the lime is provided by a cooling fan 21, and the lime enters the kiln chamber of the kiln body through a cooling air supply pipe 24 of each of the two kiln bodies, so that the cooling of the finished product ash in the kiln chamber is realized.

Claims

1. A double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln is characterized by comprising two kiln bodies, wherein the chambers of the two kiln bodies are communicated; each kiln body is composed of a shell and a refractory kiln lining built on the inner wall of the shell, a cavity in the middle of the kiln lining is a kiln chamber, the cross section of the kiln chamber is rectangular, the kiln chamber is sequentially divided into a preheating zone, a calcining zone and a cooling zone from top to bottom, a fuel spray gun, a combustion air inlet pipe and a flue gas discharge pipe are arranged in the preheating zone, a cooling air supply pipe and a connecting channel penetrating through the kiln chambers in the two kiln bodies are arranged in the cooling zone, and ignition and drying burners are arranged in the connecting channel.

2. The double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln as claimed in claim 1, wherein a limestone feeding device is arranged outside the kiln body and comprises a kiln top bin, a discharging valve, a distributor, a feeding vehicle, a feeding guide rail and a winch, the kiln top bin is arranged above the two kiln bodies, the two discharging valves are arranged at the bottom of the kiln top bin, each discharging valve is connected with one distributor, the two distributors are respectively arranged at the tops of the two kiln bodies, the feeding guide rail is arranged on the outer wall of one of the kiln bodies, and the feeding vehicle is arranged on the feeding guide rail and connected with the winch.

3. The double-rectangular-chamber heat-accumulation and co-current lime shaft kiln as claimed in claim 1, wherein the bottom of the kiln body is provided with an ash discharging device, the ash discharging device comprises a single-kiln ash discharger, a single-kiln finished ash bin, a single-kiln discharge valve, an assembly finished ash bin and a total ash discharger, the bottom of each kiln body is provided with a set of the single-kiln ash discharger, the single-kiln finished ash bin and the single-kiln discharge valve which are connected in sequence, the single-kiln discharge valve is connected to the assembly finished ash bin, and the assembly finished ash bin is connected to the total ash discharger.

4. The double rectangular-bore heat-accumulating co-current lime shaft kiln as claimed in claim 1, wherein the kiln bore is in a straight cylinder shape from top to bottom.

5. The double rectangular bore regenerative co-current lime shaft kiln of claim 1, wherein the rectangular cross-section of the kiln bore is 5-8 meters in length and 2-3 meters in width.

6. The double rectangular bore regenerative co-current lime shaft kiln of claim 1, wherein the four corners of the rectangular cross section of the kiln bore are provided with transition arcs.

7. The double rectangular bore regenerative co-current lime shaft kiln according to claim 6, wherein the radius of the transition arc is 0.4-0.6 m.

8. The double rectangular bore regenerative co-current lime shaft kiln of claim 1, wherein said fuel lances are evenly disposed on the inner wall of the kiln bore at the upper portion of the preheating zone.

9. The double rectangular-bore regenerative co-current lime shaft kiln according to claim 1, wherein the lower portion of the combustion air inlet pipe is connected to the connecting passage, and the upper portion thereof is connected to the combustion fan, and to the flue gas discharge pipe connected to the dust collector through two parallel directional valves.