CN114455860A

CN114455860A - Double-hearth lime kiln and operation method thereof

Info

Publication number: CN114455860A
Application number: CN202210186658.0A
Authority: CN
Inventors: 蒋雨锟; 段国建; 陈秀娟; 冯燕波; 王得刚; 全强; 孟凯彪; 田辉
Original assignee: Capital Engineering & Research Inc Ltd
Current assignee: Capital Engineering & Research Inc Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-05-10
Anticipated expiration: 2042-02-28
Also published as: CN114455860B

Abstract

The invention discloses a double-hearth lime kiln and an operation method thereof, which relate to the field of industrial kilns, and the double-hearth lime kiln comprises the following components: a material distribution mechanism having a first outlet and a second outlet; the inlet of the first charging bin mechanism can be connected with the first outlet of the material distribution mechanism in a switching mode; the kiln chamber with first chamber kiln and second chamber kiln, the import of first chamber kiln can with the export of first feed bin mechanism realizes the break-make, the import of second chamber kiln can with the break-make is realized to feed mechanism's second export, first chamber kiln with have the intermediate passage that enables both to communicate between the second chamber kiln, the lower extreme of first chamber kiln has the export, the lower extreme of second chamber kiln has the export. The time that the kiln needs to be stopped during reversing can be reduced, and therefore production efficiency is improved.

Description

Double-hearth lime kiln and operation method thereof

Technical Field

The invention relates to the field of industrial kilns, in particular to a double-hearth lime kiln and an operation method thereof.

Background

With the continuous promotion of environmental protection requirements, traditional lime kilns such as gas-fired shaft kilns, coke shaft kilns and the like with high energy consumption, high pollution and low yield are gradually eliminated. The lime kiln projects newly built in the market at present mainly comprise a rotary kiln, a double-chamber kiln and a sleeve kiln. Among them, the double-hearth kiln is widely used due to the characteristics of relatively low investment and land occupation and high energy utilization rate.

Fig. 1 is a schematic structural diagram of a double-hearth lime kiln in the prior art, and as shown in fig. 1, a hearth kiln of the double-hearth lime kiln has two identical cylinder hearths, specifically, a first hearth kiln 21 and a second hearth kiln 22, which share one set of gas flue gas system. The first chamber 21 and the second chamber 22 are connected by an annular intermediate passage 23. While one kiln chamber is calcined, the other kiln chamber stores heat. Injecting fuel and combustion-supporting air in the calcining chamber into the kiln from a spray gun at the top of the kiln, heating the raw material limestone from top to bottom by heat flow of about 1100 ℃ generated by combustion, and performing decomposition reaction on the limestone to obtain finished quick lime; the cooling air at the lower part of the kiln chamber flows from bottom to top to reduce the temperature of the finished product. The cooling air is mixed with the combustion flue gas, the mixture passes through the intermediate channel, the heat is fully exchanged with the raw materials of the heat storage chamber, the temperature of the combustion flue gas is reduced from about 900 ℃ to about 180 ℃, and then the flue gas is discharged from a flue gas pipeline of the heat storage chamber. After the calcination is finished, stopping the kiln from the calcination chamber, reversing, stopping introducing the coal gas and combustion-supporting air, purging the coal gas in the kiln by using nitrogen, and discharging the coal gas from a bleeding valve; then, the kiln top loads raw materials into the kiln, and the kiln bottom unloads a finished product to a belt; after the charging and discharging are finished, the reversing valve and the gas sealing valve start to move, the gas and the combustion-supporting air are led to the other kiln chamber for combustion, the reversing of the calcining chamber and the heat storage chamber is realized, and the process is repeated.

Disclosure of Invention

The technical problem to be solved by the embodiment of the invention is to provide a double-hearth lime kiln and an operation method thereof, which can reduce the time for stopping the lime kiln during reversing, thereby improving the production efficiency.

The specific technical scheme of the embodiment of the invention is as follows:

a dual-chamber lime kiln, comprising:

a feed mechanism having a first outlet and a second outlet;

the inlet of the first charging bin mechanism can be connected with the first outlet of the material distributing mechanism in a switching mode;

the kiln chamber with first chamber kiln and second chamber kiln, the import of first chamber kiln can with the export of first feed bin mechanism realizes the break-make, the import of second chamber kiln can with the break-make is realized to feed mechanism's second export, first chamber kiln with have the intermediate passage that enables both to communicate between the second chamber kiln, the lower extreme of first chamber kiln has the export, the lower extreme of second chamber kiln has the export.

Preferably, the double-bore lime kiln further comprises: the inlet of the second charging bin mechanism can be connected with the second outlet of the material distributing mechanism in a switching mode; and the inlet of the second hearth kiln can be connected with the outlet of the second charging bin mechanism in a switching mode.

Preferably, a first material distribution cylinder is connected to an outlet of the first loading bin mechanism, and the first material distribution cylinder can rotate in the horizontal direction and can rotate in the vertical direction;

and the outlet of the second charging bin mechanism is connected with a second material distribution cylinder, and the second material distribution cylinder can rotate in the horizontal direction and can rotate in the vertical direction.

Preferably, the first hopper mechanism comprises a first hopper; the first air inlet pipe can be communicated with the first charging bin and is used for pressurizing the first charging bin;

the second hopper mechanism comprises a second hopper; and the second air inlet pipe can be communicated with the second charging bin and is used for pressurizing the second charging bin.

Preferably, a first closing gate is arranged at the inlet of the first loading bin mechanism; a first material level meter is arranged in the first charging bin, and when the first material level meter detects that the material in the first charging bin meets a preset amount, the first closing gate is closed;

a second closing gate is arranged at the inlet of the second charging bin mechanism; and a second material level meter is arranged in the second charging bin, and when the second material level meter detects that the material in the second charging bin meets the preset amount, the second closing gate is closed.

Preferably, the double-bore lime kiln further comprises: the inlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode, and the outlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode;

and the inlet of the second middle discharging bin mechanism can be connected with the outlet of the second hearth kiln in a connected mode, and the outlet of the second middle discharging bin mechanism can be connected in a connected mode.

Preferably, the first intermediate discharge bin mechanism comprises a first discharge bin; the third air inlet pipe can be communicated with the first discharging bin and is used for pressurizing the first discharging bin;

the second intermediate discharging bin mechanism comprises a second discharging bin; and the fourth air inlet pipe can be communicated with the second discharging bin and is used for pressurizing the second discharging bin.

Preferably, a first cooling pipe is wound on the side wall of the first discharging bin, and cooling fluid is introduced into the first cooling pipe; and a second cooling pipe is wound on the side wall of the second discharging bin, and cooling fluid is introduced into the second cooling pipe.

Preferably, the first hopper mechanism further comprises a first exhaust pipe communicable with the first hopper; the second charging bin mechanism further comprises a second exhaust pipe which can be communicated with the second charging bin.

Preferably, the first intermediate discharging bin mechanism further comprises a third exhaust pipe which can be communicated with the first discharging bin; the second middle discharging bin mechanism further comprises a fourth exhaust pipe which can be communicated with the second discharging bin.

A method of operating a dual-chamber lime kiln as claimed in any one of the preceding claims, the dual-chamber lime kiln further comprising: the inlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode, and the outlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode;

the operation method comprises the following steps:

when the second hearth kiln is calcined, an inlet of the first intermediate discharging bin mechanism is communicated with an outlet of the first hearth kiln, and an outlet of the first intermediate discharging bin mechanism is disconnected, so that finished quick lime in the first hearth kiln is conveyed into the first intermediate discharging bin mechanism;

after the finished quick lime in the first hearth kiln is conveyed to the first intermediate discharging bin mechanism, disconnecting an inlet of the first intermediate discharging bin mechanism from an outlet of the first hearth kiln, and opening an outlet of the first intermediate discharging bin mechanism to discharge the finished quick lime in the first intermediate discharging bin mechanism;

when the second hearth kiln is calcined, the inlet of the first charging bin mechanism is communicated with the first outlet of the material distribution mechanism, and the outlet of the first charging bin mechanism is disconnected from the inlet of the first hearth kiln, so that limestone is conveyed from the first outlet of the material distribution mechanism to the first charging bin mechanism.

Preferably, the double-bore lime kiln further comprises: the inlet of the second charging bin mechanism can be connected with the second outlet of the material distributing mechanism in a switching mode; the inlet of the second hearth kiln can be connected with the outlet of the second charging bin mechanism in a switching mode;

the inlet of the second intermediate discharging bin mechanism can be connected with the outlet of the second hearth kiln, and the outlet of the second intermediate discharging bin mechanism can be connected;

the operation method comprises the following steps:

communicating the outlet of the first charging bin mechanism with the inlet of the first kiln during or after calcination in the second kiln so that limestone in the first charging bin mechanism is conveyed into the first kiln;

after the limestone is conveyed to the first hearth kiln, calcining the first hearth kiln;

when the first hearth kiln is calcined, an inlet of the second intermediate discharging bin mechanism is communicated with an outlet of the second hearth kiln, and an outlet of the second intermediate discharging bin mechanism is disconnected, so that finished quick lime in the second hearth kiln is conveyed to the second intermediate discharging bin mechanism;

after the finished quick lime in the second hearth kiln is conveyed to the second intermediate discharging bin mechanism, disconnecting an inlet of the second intermediate discharging bin mechanism from an outlet of the second hearth kiln, and opening an outlet of the second intermediate discharging bin mechanism to discharge the finished quick lime in the second intermediate discharging bin mechanism;

and when the first hearth kiln is calcined, communicating an inlet of a second charging bin mechanism with a second outlet of the material distribution mechanism, and disconnecting an outlet of the second charging bin mechanism from the inlet of the second hearth kiln so as to convey limestone from the second outlet of the material distribution mechanism to the second charging bin mechanism.

The technical scheme of the invention has the following remarkable beneficial effects:

after the calcination of the first kiln in the double-kiln is completed, the charging of the first kiln is completed without waiting, and the second kiln can be directly calcined. When the second hearth kiln is used for calcining, the inlet of the first charging bin mechanism is communicated with the first outlet of the material distribution mechanism, and the outlet of the first charging bin mechanism is disconnected with the inlet of the first hearth kiln, so that limestone is conveyed from the first outlet of the material distribution mechanism to the first charging bin mechanism. By the mode, the time for waiting for charging the first hearth kiln can be reduced, the time for stopping the kiln during reversing is reduced, and therefore the production efficiency is improved.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

FIG. 1 is a schematic structural diagram of a prior art double-hearth lime kiln;

FIG. 2 is a schematic structural diagram of a double-chamber lime kiln in the embodiment of the application;

FIG. 3 is a schematic illustration of the construction of a first hopper in an embodiment of the present application;

FIG. 4 is a schematic view of the structure of the first distribution cylinder in the embodiment of the present application;

fig. 5 is a schematic structural view of a first intermediate discharging bin in the embodiment of the present application.

Reference numerals of the above figures:

1. a material distributing mechanism; 11. a first outlet; 12. a second outlet; 13. a material distributing bin; 14. a chute; 2. a kiln chamber; 21. a first chamber kiln; 22. a second chamber kiln; 23. a middle channel; 3. a belt; 4. a first hopper mechanism; 41. a first distribution cylinder; 42. a first hopper; 43. a first intake pipe; 44. a first closing gate; 45. a first level indicator; 46. a third closing gate; 47. a first hand hole; 48. a first intake valve; 410. a first exhaust pipe; 411. a first exhaust valve; 412. a rotation driving mechanism; 413. a water inlet pipe; 414. a water outlet pipe; 5. a second hopper mechanism; 51. a second distribution cylinder; 52. a second closing gate; 53. a fourth closing gate; 6. a first intermediate discharge bin mechanism; 61. a first discharging bin; 62. a third intake pipe; 63. a first cooling pipe; 64. a fifth closing gate; 65. a seventh closing gate; 66. a third level gauge; 67. a third air inlet valve; 68. a third exhaust pipe; 69. a third exhaust valve; 610. a third hand hole; 7. a second intermediate discharge bin mechanism; 71. a sixth closing gate; 72. an eighth closing gate.

Detailed Description

The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The currently used double-hearth kilns generally need to be stopped during reversing, and taking the most common maltz model in the double-hearth kilns as an example, the duration of each procedure of one current production period is approximately as follows: the calcination time of the single kiln chamber 2 is 12 minutes, the time for blowing the gas by nitrogen after calcination is 5S, the discharge and charging time is 40S, and the movement time of the reversing valve and the gas sealing valve in the period is 10S. The double-hearth kiln has the advantages of fully utilizing the waste heat of flue gas after combustion, but has the defect that the kiln must be stopped during charging and discharging. Because the kiln is in positive pressure during the calcination, if a blanking or charging device is started, high-temperature and high-pressure smoke is flushed out of the kiln, so that accidents and dust emission are caused; but also causes high-pressure airflow to rush into the distribution bin 13 and the chute 14, and the distribution process is disturbed. Therefore, the current production generally needs to be stopped so as to complete the discharging and charging operation. In order to improve the production efficiency, the opening and closing time sequence of each valve is fully optimized in the existing lime kiln factory to shorten the time for stopping the kiln, and the smoke suction force is increased even on the top of the kiln in individual factory to form temporary local negative pressure so as to prevent the smoke from escaping during charging, thereby developing a production mode for moving the charging process from the reversing period to the calcining period. Even with numerous production scheme improvements, such as the current lime kiln requires kiln shutdown and reversing for about 55 seconds every about 12 minutes of calcination production, as calculated above, the production efficiency is 92.9% calcination time length/(nitrogen purge 5S + calcination time length 12 minutes + kiln shutdown time length 40S + reversing time length 10S).

The applicant finds, through the above analysis, that 7% of production efficiency is still not utilized, so that, from the viewpoint of equipment design, a new type of double-chamber lime kiln is proposed in combination with actual production, which can reduce the time required for stopping the lime kiln during reversing, thereby improving production efficiency, and fig. 2 is a schematic structural diagram of the double-chamber lime kiln in the embodiment of the present application, and as shown in fig. 2, the double-chamber lime kiln in the embodiment may include: a distribution mechanism 1 having a first outlet 11 and a second outlet 12; the inlet of the first charging bin mechanism 4 can be connected with the first outlet 11 of the material distributing mechanism 1; the kiln comprises a kiln chamber 2 provided with a first chamber kiln 21 and a second chamber kiln 22, wherein an inlet of the first chamber kiln 21 can be connected with an outlet of a first charging bin mechanism 4 in an on-off mode, an inlet of the second chamber kiln 22 can be connected with a second outlet 12 of a material distribution mechanism 1 in an on-off mode, an intermediate channel 23 enabling the first chamber kiln 21 and the second chamber kiln 22 to be communicated is arranged between the first chamber kiln 21 and the second chamber kiln 22, an outlet is arranged at the lower end of the first chamber kiln 21, and an outlet is arranged at the lower end of the second chamber kiln 22.

After the calcination of the first kiln 21 in the double-hearth lime kiln is completed, the second kiln 22 can be directly calcined without waiting for the completion of the charging of the first kiln 21. While the second chamber kiln 22 is conducting calcination, the inlet of the first charging bin mechanism 4 is communicated with the first outlet 11 of the material distributing mechanism 1, and the outlet of the first charging bin mechanism 4 is disconnected from the inlet of the first chamber kiln 21, so that limestone is conveyed from the first outlet 11 of the material distributing mechanism 1 into the first charging bin mechanism 4. By the mode, the waiting time for charging the first hearth kiln 21 can be reduced, the time for stopping the kiln during reversing is reduced, and the production efficiency is improved.

In order to better understand the double-hearth lime kiln of the present application, it will be further explained and illustrated below. As shown in fig. 2, the dual-chamber lime kiln may include: a material distributing mechanism 1, a first charging bin mechanism 4, a kiln chamber 2 with a first kiln 21 and a second kiln 22. The distributing mechanism 1 has a first outlet 11 and a second outlet 12, and the charging of the first charging bin mechanism 4 is realized through the first outlet 11.

As shown in fig. 2, the distribution mechanism 1 may include a distribution bin 13 and at least two chutes 14. The material distributing bin 13 is used for storing or conveying limestone materials; the two chutes 14 are respectively communicated with the material distributing bin 13, the first outlet 11 is positioned at the lower end of one chute 14, and the second outlet 12 is positioned at the lower end of the other chute 14.

As shown in fig. 2, the first hopper mechanism 4 has an inlet and an outlet, and the inlet of the first hopper mechanism 4 can be opened and closed with the first outlet 11 of the material distributing mechanism 1. The kiln chamber 2 is provided with a first chamber kiln 21 and a second chamber kiln 22, the inlet of the first chamber kiln 21 can be connected with the outlet of the first charging bin mechanism 4, and the inlet of the second chamber kiln 22 can be connected with the second outlet 12 of the material distribution mechanism 1. A first closing gate 44 is arranged at the inlet of the first hopper mechanism 4, so that switching is realized. The outlet of the first loading bin mechanism 4 is provided with a third closing gate 46, so that the opening and closing are realized. The first silo device 4 can be connected to and isolated from the environment by means of a first closing sluice 44, and the first silo device 4 can be connected to and isolated from the environment of the first kiln 21 by means of a third closing sluice 46.

As a practical matter, the first closing gate 44 and the third closing gate 46 may be valves, the type of the valves may be ball valves, gate valves, blind plate valves, etc., and the driving of the valves may be electric, hydraulic, pneumatic, etc. The remote control and signals of the closed gate can be connected to the main control chamber of the double-chamber lime kiln, the main control chamber can remotely operate the closed gate, and the on and off states of the valve are displayed on the screen of the main control chamber.

Fig. 3 is a schematic structural view of the first charging bin in the embodiment of the present application, and as shown in fig. 3, the first charging bin mechanism 4 may include a first charging bin 42 having an inlet port, which may be located at an upper end surface of the first charging bin 42, and an outlet port, which may be located at a lowermost end of the first charging bin 42, so that the limestone raw material can fall down by gravity. The upper portion of the first magazine 42 may be a cylindrical structure and the lower portion may be an inverted cone or an inverted frustum structure. The inner layer of the first charging bin 42 is provided with a wear-resistant steel plate so as to reduce the impact and the abrasion of the limestone raw material on the bin wall. The lower part of the first charging bin 42 is welded with a plurality of steel structure supports, so that the first charging bin 42 is located on a kiln top steel structure platform. The first hopper 42 may be made of a high strength material such as Q355R, which is not limited in this application.

As shown in fig. 3, a first distributing cylinder 41 may be connected to the outlet of the first hopper mechanism 4, and the first distributing cylinder 41 may be rotatable in the horizontal direction and rotatable in the vertical direction. The first distribution cylinder 41 can be located at the outlet of the first hopper 42, downstream of the third shutter 46. Fig. 4 is a schematic structural diagram of the first distribution cylinder in the embodiment of the present application, and as shown in fig. 4, the first distribution cylinder 41 is connected to a rotation driving mechanism 412, so as to drive the first distribution cylinder 41 to rotate. The first distribution cylinder 41 can rotate 360 degrees in the horizontal direction and rotate 90 degrees up and down in the vertical direction, that is, the first distribution cylinder 41 rotates from right below to the horizontal direction. Through the mode, the rotation in the horizontal direction ensures that the granularity of the raw materials in the circular rings at equal intervals from the central line of the first kiln chamber 2 is uniform, the vertical rotation of 90 degrees ensures that the granularity of the raw materials on the circular rings at different distances from the central line of the kiln chamber 2 is uniform, and the two rotation modes are combined, so that the granularity of the materials in the first kiln chamber 2 is uniform, and the segregation of the materials can be reduced. The rotation driving mechanism 412 may be a driving device of the first distribution cylinder 41, and the driving method may be hydraulic or electric. For example, the rotation driving mechanism 412 may include two motors, wherein a gear shaft of one motor is in contact and meshed with an upper flange of the first distributing cylinder 41, and the motor drives the first distributing cylinder 41 to integrally rotate, so as to realize 360-degree horizontal rotation of the first distributing cylinder 41; the rotating shaft of the other motor can be connected with the first distributing cylinder 41 through a steel wire rope so as to realize the up-and-down rotation of the cylinder below by 90 degrees.

As shown in fig. 4, since the rotary driving mechanism 412 is close to the first kiln 21 and the working environment temperature is high, it is feasible to provide a circulating water cooling system at the rotary driving mechanism 412, wherein industrial open or closed soft water can be adopted in the circulating water cooling system. The circulating water cooling system comprises a water storage tank, a water inlet pipe 413 and a water outlet pipe 414, wherein cooling water flows into a water cooling pipeline in the rotary driving mechanism 412 through the water inlet pipe 413, so that the cooling water exchanges heat with the rotary driving mechanism 412 and then flows into the water storage tank from the water outlet pipe 414. The cooling of the rotary drive mechanism 412 is achieved in the manner described above.

As shown in fig. 3, a first level gauge 45 is provided in the first hopper 42, and when the first level gauge 45 detects that the material in the first hopper 42 satisfies a preset amount, the first closing gate 44 is closed. For precise control of the amount of raw material charged into the first hopper 42 from the feed mechanism 1 each time, a first level gauge 45 may be provided on the cylindrical side wall of the first hopper 42, and the first level gauge 45 may be of a laser level gauge or a radar level gauge. The level gauge signal may be transmitted to the main control room screen and the display status may include "not full" and "full". The first level indicator 45 is linked with the first closed gate 44 in a PLC mode, namely when the material in the first charging bin 42 meets the preset amount, the first closed gate 44 is automatically closed, so that the phenomenon that the charging is too much to cause production fluctuation is avoided.

In addition, in order to ensure regular maintenance and cleaning of the interior of the first loading bin 42, a first hand hole 47 may be provided on the cylindrical side wall of the first loading bin 42, for example, the first hand hole 47 may be sized between DN200mm and DN300mm to ensure the use requirement.

As shown in fig. 3, it is possible that the first hopper mechanism 4 may include a first intake duct 43 communicable with the first hopper 42, the first intake duct 43 being used to pressurize the first hopper 42. The pressurizing gas medium may be a non-combustible safety gas such as nitrogen. A first intake valve 48 may be installed on the first intake duct 43, and the first intake duct 43 may be installed on the top of the first charging bin 42. The gaseous medium may be fed into the first charging bin 42 through the first gas inlet pipe 43, and the pressure of the gaseous medium may be about 10kpa to 20kpa higher than the operating pressure in the first chamber kiln 21, and it is considered that the pressure of the gas source may be about 60kpa to 70kpa as the pressure of the first gas inlet pipe 43 is decreased, so as to seal the kiln gas. First admission valve 48 is used for the UNICOM of control pipeline and closes, and ball valve, gate valve and butterfly valve etc. can be adopted to the valve model of first admission valve 48, and the drive mode can adopt and surge, electronic or pneumatics etc.. The first intake valve 48 is remotely controlled and signally connected to the main control room and displays the valve "on" and "off" states on the main control room screen.

After the limestone raw material is charged into the first charging bin 42 of the first charging bin mechanism 4, the first closed lock 44 and the third closed lock 46 are closed, and the pressure in the first charging bin 42 is increased to about 10kpa to 20kpa higher than the pressure in the first kiln 21 through the first air inlet pipe 43. Next, when the limestone raw material filled in the first charging bin 42 needs to be conveyed into the first hearth 21, the third closing gate 46 is opened, and the limestone in the first charging bin 42 uniformly falls into the first hearth 21 along the rotating first distributing cylinder 41, so that the charging is completed; during this time, the first charging bin 42 is isolated from the external environment and is in communication with the environment inside the first kiln 21. It should be noted that, since the external environment is communicated with the material distributing mechanism 1, the first charging bin 42 is isolated from the material distributing mechanism 1, that is, isolated from the external environment. After the charging is completed, the third closing gate 46 is closed. Thus, the production is repeated and continuous. The discharging process at the bottom of the kiln is the same as the charging principle.

As shown in fig. 3, the first hopper mechanism 4 may include a first exhaust pipe 410 that can communicate with the first hopper 42. A first exhaust valve 411 may be installed at the first exhaust pipe 410. The first exhaust pipe 410 is used for exhausting the gas or high-pressure gas mixed from the first chamber kiln 21 in the first charging bin 42. When the gas in the first hearth kiln 21 is not sufficiently combusted, the redundant gas can enter the first charging bin 42, and the gas needs to be diffused so as to eliminate potential safety hazards; during shutdown for maintenance, high-pressure gas remaining during production in the first silo 42 needs to be discharged to ensure safe operation. The first exhaust valve 411 is used for controlling the connection and the closing of the first exhaust pipe 410, the valve type of the first exhaust valve 411 can adopt a ball valve, a gate valve, a butterfly valve and the like, and the driving adopts hydraulic, electric or pneumatic. The first exhaust valve 411 is remotely controlled and signally connected to the main control room, and displays the valve "on" and "off" states on the screen of the main control room.

As shown in fig. 2, an intermediate passage 23 is provided between the first kiln 21 and the second kiln 22 to allow the two to communicate with each other, and heat can be sufficiently exchanged between the first kiln 21 and the second kiln 22 through the intermediate passage 23, that is, when one kiln performs firing, the other kiln performs heat storage. The lower end of the first hearth 21 is provided with an outlet, the lower end of the second hearth 22 is provided with an outlet, and finished products in the first hearth 21 and the second hearth 22 are discharged to the belt 3 through the outlet and are conveyed away.

The first charging bin 42 is used as an intermediary and is clamped between the inner environment and the outer environment of the first hearth kiln 21, so that the inner environment and the outer environment of the charging kiln during calcination are isolated, solid flying dust of charging is eliminated, and charging without stopping the kiln is realized. That is, after the calcination of the first kiln 21 in the double-kiln is completed, the second kiln 22 can directly perform the calcination without waiting for the completion of the charging of the first kiln 21. While the second chamber kiln 22 is conducting calcination, the inlet of the first charging bin mechanism 4 is communicated with the first outlet 11 of the material distributing mechanism 1, and the outlet of the first charging bin mechanism 4 is disconnected from the inlet of the first chamber kiln 21, so that limestone is conveyed from the first outlet 11 of the material distributing mechanism 1 into the first charging bin mechanism 4. By the mode, the time for waiting for charging the first hearth kiln 21 can be reduced, the time for stopping the kiln during reversing is reduced, and therefore the production efficiency is improved.

When the first charging bin 42 discharges into the first hearth kiln 21, the first charging bin passes through the first air inlet pipe43 is pressurized to be higher than the pressure in the first hearth kiln 21 in the first charging bin 42, thereby not only sealing the flue gas in the first hearth kiln 21 by using a high-pressure environment, but also avoiding NOx and SO₂The smoke overflows from the kiln top, so that the investment of smoke pumping equipment on the kiln top can be reduced; and the high-pressure environment prevents the airflow in the kiln from flowing upwards to disturb the distribution, and reduces the material segregation, thereby being beneficial to improving the product quality.

Further, as shown in fig. 2, the double-hearth lime kiln may include: the inlet of the second charging bin mechanism 5 can be connected with the second outlet 12 of the material distributing mechanism 1; the inlet of the second chamber kiln 22 can be opened and closed with the outlet of the second charging bin mechanism 5. The second charging bin mechanism 5 is provided with an inlet and an outlet, and the inlet of the second charging bin mechanism 5 can be connected with and disconnected with the second outlet 12 of the material distributing mechanism 1. The kiln chamber 2 is provided with a first chamber kiln 21 and a second chamber kiln 22, and the inlet of the second chamber kiln 22 can be connected with and disconnected with the outlet of the second charging bin mechanism 5. A second closing gate 52 is arranged at the inlet of the second loading bin mechanism 5, so that the opening and closing are realized. The outlet of the second charging bin mechanism 5 is provided with a fourth closing gate 53, so that the opening and closing are realized. The second charging hopper means 5 can be connected and isolated from the environment by the second closing sluice 52, and the second charging hopper means 5 can be connected and isolated from the environment of the second chamber kiln 22 by the fourth closing sluice 53.

As a practical matter, the second closing gate 52 and the fourth closing gate 53 may be valves, the type of the valves may be ball valves, gate valves, blind plate valves, etc., and the driving of the valves may be electric, hydraulic, pneumatic, etc. The remote control and signals of the closed gate can be connected to the main control chamber of the double-chamber lime kiln, the main control chamber can remotely operate the closed gate, and the on and off states of the valve are displayed on the screen of the main control chamber.

The second hopper mechanism 5 may comprise a second hopper having an inlet which may be located at an upper end face of the second hopper and an outlet which may be located at a lowermost end of the second hopper to enable limestone raw material to fall by gravity. The upper part of the second charging bin can be a cylinder structure, and the lower part can be an inverted cone or an inverted frustum structure. The inner layer of the second charging bin is provided with a wear-resistant steel plate so as to reduce the impact and wear of the limestone raw material on the bin wall. And a plurality of steel structure supports are welded at the lower part of the second charging bin, so that the second charging bin is located on the kiln top steel structure platform. The second hopper may be made of a high strength material such as Q355R, which is not limited in this application.

A second distribution cylinder 51 may be connected to the outlet of the second hopper mechanism 5, the second distribution cylinder 51 being rotatable in the horizontal direction and rotatable in the vertical direction. The second distribution cylinder 51 can be located at the outlet of the second hopper, downstream of the fourth closing shutter 53. The second distribution cylinder 51 is connected to a rotation driving mechanism, so that the second distribution cylinder 51 is driven to rotate. The second distribution cylinder 51 is capable of 360-degree rotation in the horizontal direction and 90-degree up-and-down rotation in the vertical direction. Likewise, as a practical matter, a water circulation cooling system may be provided at the rotation driving mechanism of the second distribution cylinder 51, and the water circulation cooling system is the same as that at the rotation driving mechanism of the first distribution cylinder 41, and will not be described herein.

As a possibility, a second level gauge may be provided in the second hopper, and the second closing gate 52 is closed when the second level gauge detects that the material in the second hopper satisfies the preset amount. In order to accurately control the amount of raw material loaded into the second hopper from the material distributing mechanism 1 each time, a second level gauge may be provided on the cylindrical side wall of the second hopper, and the type of the second level gauge may be a laser level gauge or a radar level gauge. The level gauge signal may be transmitted to the main control room screen and the display status may include "not full" and "full". The second level indicator is linked with the second closed gate 52 in a PLC mode, namely when the materials in the second loading bin meet the preset amount, the second closed gate 52 is automatically closed, so that the phenomenon that the loading is too much to cause production fluctuation is avoided.

To ensure regular servicing and cleaning of the interior of the second hopper, a second hand hole may be provided in the cylindrical side wall of the second hopper, for example, the second hand hole may be sized between DN200mm and DN300mm to ensure the use requirement.

As a possibility, the second hopper mechanism 5 may comprise a second air inlet conduit communicable with the second hopper, the second air inlet conduit being adapted to pressurise the second hopper. The pressurizing gas medium may be a non-combustible safety gas such as nitrogen. A second air inlet valve may be installed on the second air inlet pipe, and the second air inlet pipe may be installed at the top of the second hopper. The gaseous medium may be fed into the second silo through the second gas inlet pipe, and the pressure of the gaseous medium may be about 10kpa to 20kpa higher than the operating pressure in the second chamber kiln 22, and considering that the pressure of the gas source may be about 60kpa to 70kpa as the pressure of the second gas inlet pipe is decreased, the gas in the kiln is sealed. The second admission valve is used for the UNICOM of control line and closes, and the valve model of second admission valve can adopt ball valve, gate valve and butterfly valve etc. and the drive mode can adopt and surge, electronic or pneumatics etc.. The remote control and signal of the second air inlet valve are connected to the main control room, and the on and off states of the valve are displayed on a screen of the main control room.

The second hopper mechanism 5 may include a second exhaust pipe communicable with the second hopper. A second exhaust valve may be mounted on the second exhaust pipe. The second exhaust duct is used for discharging the gas or high-pressure gas mixed in from the second chamber kiln 22 in the second charging bin. When the gas in the second hearth kiln 22 is not sufficiently combusted, the redundant gas can enter the second charging bin and needs to be diffused so as to eliminate potential safety hazards; when the kiln is stopped for maintenance, high-pressure gas remained in the second loading bin during production needs to be discharged so as to ensure safe operation. The second exhaust valve is used for controlling the communication and the closing of the second exhaust pipe, the valve model of the second exhaust valve can adopt a ball valve, a gate valve, a butterfly valve and the like, and the driving adopts hydraulic driving, electric driving or pneumatic driving. The remote control and signal of the second exhaust valve are connected to the main control room, and the on and off states of the valve are displayed on a screen of the main control room.

After the limestone raw material is filled in the second charging bin of the second charging bin mechanism 5, the second closed gate 52 and the fourth closed gate 53 are closed, and the pressure in the second charging bin is increased to about 10kpa to 20kpa higher than the pressure in the second chamber kiln 22 through the second air inlet pipe. Then, when the limestone raw material filled in the second charging bin needs to be conveyed into the second hearth kiln 22, the fourth closing gate 53 is opened, and the limestone in the second charging bin uniformly falls into the second hearth kiln 22 along the rotating second distributing cylinder 51, so that the charging is completed; during this time the second silo is isolated from the environment and is in communication with the environment inside the second kiln 22. After the charging is completed, the fourth closing gate 53 is closed. Thus, the production is repeated and continuous. The discharging process at the bottom of the kiln is the same as the charging principle.

The second charging bin is used as an intermediary and is clamped between the inner environment and the outer environment of the second hearth kiln 22, so that the inner environment and the outer environment of the charging kiln during calcination are isolated, solid flying dust during charging is eliminated, and charging without stopping the kiln is realized. That is, after the calcination of the second kiln 22 in the double-kiln is completed, the first kiln 21 can directly perform the calcination without waiting for the completion of the charging of the second kiln 22. While the first chamber 21 is performing the calcination, the inlet of the second charging bin mechanism 5 is communicated with the second outlet 12 of the material dividing mechanism 1, and the outlet of the second charging bin mechanism 5 is disconnected from the inlet of the second chamber 22, so that the limestone is conveyed from the second outlet 12 of the material dividing mechanism 1 into the second charging bin mechanism 5. By the above manner, the time for waiting for charging the second hearth kiln 22 can be reduced, the time for stopping the kiln during reversing can be reduced, and the production efficiency can be improved.

Similarly, when the second charging bin discharges materials into the second hearth kiln 22, the second charging bin is pressurized to be higher than the pressure in the second hearth kiln 22 through the second air inlet pipe, SO that the flue gas in the second hearth kiln 22 is sealed by a high-pressure environment, and NOx and SO are prevented₂The smoke overflows from the kiln top, so that the investment of smoke pumping equipment on the kiln top can be reduced; and the high-pressure environment prevents the airflow in the kiln from flowing upwards to break the distribution, reduces material segregation and is beneficial to improving the product quality.

As a possibility, as shown in fig. 2, a double-hearth lime kiln may comprise: the inlet of the first middle discharging bin mechanism 6 can be connected with the outlet of the first hearth kiln 21, and the outlet of the first middle discharging bin mechanism 6 can be connected and disconnected. After the calcination in the first kiln 21 is completed, the second kiln 22 can be directly calcined without waiting for the completion of the discharge from the first kiln 21. When the second hearth kiln 22 is calcined, the inlet of the first intermediate discharging bin mechanism 6 is communicated with the outlet of the first hearth kiln 21, and the outlet of the first intermediate discharging bin mechanism 6 is disconnected from the external environment, so that the calcined finished product is conveyed from the outlet of the first hearth kiln 21 to the first intermediate discharging bin mechanism 6. Then, the inlet of the first intermediate discharging bin mechanism 6 is disconnected from the outlet of the first hearth kiln 21, and the outlet of the first intermediate discharging bin mechanism 6 is communicated with the external environment, so that the calcined finished product is conveyed to the belt 3 below from the outlet of the first intermediate discharging bin mechanism 6 and is transported away. By the mode, the time for waiting for unloading the first hearth kiln 21 can be reduced, the time for stopping the kiln during reversing is reduced, and therefore the production efficiency is improved. The inlet of the first intermediate discharging bin mechanism 6 is provided with a fifth closed gate 64, so that on-off is realized. And a seventh closed gate 65 is arranged at the outlet of the first intermediate discharging bin mechanism 6, so that the on-off is realized.

As shown in FIG. 5, the first intermediate discharge bin mechanism 6 may include a first discharge bin 61 having an inlet and an outlet. The structure of the first discharging bin 61 can be substantially the same as that of the first charging bin 42, and the description thereof is omitted. The first discharging bin 61 is provided with a third material level indicator 66, when the third material level indicator 66 detects that the material in the first discharging bin 61 meets the preset amount, the discharging is finished, and then the fifth closing gate 64 is closed. The third level indicator 66 and the fifth closing gate 64 can also be linked by PLC, that is, when the material in the first discharging bin 61 meets the preset amount, the fifth closing gate 64 is automatically closed.

As shown in fig. 5, the first intermediate discharging bin mechanism 6 may include a third air inlet pipe 62 capable of communicating with the first discharging bin 61, and the third air inlet pipe 62 is used for pressurizing the first discharging bin 61. The pressurizing gas medium may be a non-combustible safety gas such as nitrogen. A third air inlet valve 67 may be installed on the third air inlet pipe 62, and the third air inlet pipe 62 may be installed on the top of the first discharging bin 61. The gas medium can be sent to the first discharging bin 61 through the third gas inlet pipe 62, the pressure of the gas medium can be about 10kpa to 20kpa higher than the working pressure in the first chamber kiln 21, and the pressure of the gas source can be about 60kpa to 70kpa considering that the pressure of the gas source is reduced along with the pressure reduction of the third gas inlet pipe 62, so as to seal the gas in the kiln. The third air inlet valve 67 is used for controlling the communication and closing of the pipeline, the valve model of the third air inlet valve 67 can adopt a ball valve, a gate valve, a butterfly valve and the like, and the driving mode can adopt hydraulic, electric or pneumatic and the like. The third air intake valve 67 is remotely controlled and signally connected to the main control room, and displays the on and off states of the valves on the screen of the main control room.

Before the first discharging bin 61 receives the finished product calcined in the first hearth kiln 21, the fifth closing gate 64 and the seventh closing gate 65 are closed, the third air inlet valve 67 is opened, and the gas medium is introduced into the first discharging bin 61, so that the pressure of the gas medium in the first discharging bin 61 is higher than 10kPa-20kPa in the kiln, and the gas in the kiln is blocked and enters the first discharging bin 61. After the pressurization is finished, the third air inlet valve 67 is closed, then the fifth closing gate 64 is opened, and the calcined finished product in the first hearth kiln 21 is discharged and conveyed to the first discharging bin 61.

First ejection of compact storehouse 61 is as the intermediary, presss from both sides between the interior environment of first thorax kiln 21, has completely cut off the interior environment of kiln of unloading during calcining, has so not only eliminated the solid raise dust of unloading, has realized the unloading of not shutting down the kiln in addition. That is, after the calcination of the first kiln 21 in the double-kiln is completed, the second kiln 22 can directly perform the calcination without waiting for the completion of the discharge of the first kiln 21. When the second hearth kiln 22 is calcined, the inlet of the first intermediate discharging bin mechanism 6 is communicated with the outlet of the first hearth kiln 21, and the outlet of the first intermediate discharging bin mechanism 6 is disconnected from the external environment, so that the calcined finished product is conveyed to the first intermediate discharging bin mechanism 6 from the outlet of the first hearth kiln 21. By the mode, the time for waiting for unloading the first hearth kiln 21 can be reduced, the time for stopping the kiln during reversing is reduced, and therefore the production efficiency is improved.

When the first hearth kiln 21 discharges materials to the first discharging bin 61, the third air inlet pipe 62 is used for pressurizing the materials in the first discharging bin 61 to a pressure higher than the pressure in the first hearth kiln 21, SO that the flue gas in the first hearth kiln 21 is sealed by a high-pressure environment, and NOx and SO are prevented₂And the smoke overflows from the kiln bottom, so that the investment of smoke pumping equipment at the kiln bottom can be reduced.

As shown in fig. 5, a first cooling pipe 63 is wound around a side wall of the first discharging bin 61, and a cooling fluid is introduced into the first cooling pipe 63, so that the calcined finished product in the first discharging bin 61 can be cooled. When the third level gauge 66 detects that the material in the first discharging bin 61 meets the preset amount, the discharging is completed, and then the fifth closing gate 64 is closed. Then, cooling fluid is introduced into the first cooling pipe 63, heat exchange is performed between the cooling fluid and the high-temperature calcined finished product in the first discharging bin 61, after the temperature of the calcined finished product is reduced to be lower than 100 ℃, the seventh closed gate 65 is opened, and the calcined finished product in the first discharging bin 61 is discharged to the belt 3 below and conveyed away.

As shown in fig. 5, the first intermediate discharge bin mechanism 6 may include a third discharge duct 68 that may be in communication with the first discharge bin 61. A third exhaust valve 69 may be mounted on the third exhaust pipe 68. The third gas exhaust duct 68 is used for exhausting the gas or high-pressure gas mixed from the first chamber 21 in the first hopper 61. The third exhaust duct 68 may be connected to a dust removal system to remove dust from the exhaust gases. Likewise, to ensure regular maintenance and cleaning of the interior of the first discharge bin 61, a third hand hole 610 may be provided in the cylindrical sidewall of the first discharge bin 61, for example, the third hand hole 610 may be sized between DN200mm and DN300mm to ensure use requirements.

As a possibility, as shown in fig. 2, a dual-bore lime kiln may comprise: the inlet of the second middle discharging bin mechanism 7 can be connected with the outlet of the second hearth kiln 22, and the outlet of the second middle discharging bin mechanism 7 can be connected. When the calcination in the second kiln 22 is completed, the first kiln 21 can directly perform the calcination without waiting for the completion of the discharge from the second kiln 22. When the first hearth kiln 21 is calcined, an inlet of the second intermediate discharging bin mechanism 7 is communicated with an outlet of the second hearth kiln 22, and an outlet of the second intermediate discharging bin mechanism 7 is disconnected from the external environment, so that the calcined finished product is conveyed from the outlet of the second hearth kiln 22 to the second intermediate discharging bin mechanism 7. Then, the inlet of the second intermediate discharging bin mechanism 7 is disconnected from the outlet of the second hearth kiln 22, and the outlet of the second intermediate discharging bin mechanism 7 is communicated with the external environment, so that the calcined finished product is conveyed to the belt 3 below from the outlet of the second intermediate discharging bin mechanism 7 to be transported away. By the aid of the mode, time for waiting for discharging the second hearth kiln 22 can be reduced, time for stopping the kiln during reversing is reduced, and accordingly production efficiency is improved. A sixth closed gate 71 is arranged at the inlet of the second intermediate discharging bin mechanism 7, so that the on-off is realized. An eighth closed gate 72 is arranged at an outlet of the second intermediate discharging bin mechanism 7, so that on-off is realized.

The second intermediate discharge bin mechanism 7 may comprise a second discharge bin having an inlet and an outlet. The structure of the second discharging bin can be basically the same as that of the second charging bin, and the description is omitted. And a fourth material level meter is arranged in the second discharging bin, when the fourth material level meter detects that the material in the second discharging bin meets the preset quantity, the discharging is finished, and then the sixth closing gate 71 is closed. The fourth level indicator and the sixth sealing gate 71 can also be linked by PLC, namely, when the material in the second discharging bin meets the preset amount, the sixth sealing gate 71 is automatically closed.

The second middle discharging bin mechanism 7 can comprise a fourth air inlet pipe communicated with the second discharging bin, and the fourth air inlet pipe is used for pressurizing the second discharging bin. The pressurizing gas medium may be a non-combustible safety gas such as nitrogen. And a fourth air inlet valve can be installed on the fourth air inlet pipe, and the fourth air inlet pipe can be installed at the top of the second discharging bin. The gas medium can be sent into the second discharging bin through the fourth gas inlet pipe, the pressure of the gas medium can be about 10 to 20kpa higher than the working pressure in the second hearth kiln 22, and the pressure of the gas source can be about 60 to 70kpa considering that the pressure of the gas source is reduced along with the pressure reduction of the fourth gas inlet pipe, so that the gas in the kiln is sealed. The fourth admission valve is used for the intercommunication and the closing of control line, and the valve model of fourth admission valve can adopt ball valve, gate valve and butterfly valve etc. and the drive mode can adopt and surge, electronic or pneumatics etc.. The remote control and signal of the fourth air inlet valve are connected to the main control room, and the on and off states of the valve are displayed on a screen of the main control room.

Before the second discharging bin receives the finished product calcined in the second hearth kiln 22, the sixth closing gate 71 and the eighth closing gate 72 are closed, the fourth air inlet valve is opened, and the gas medium is introduced into the second discharging bin, so that the pressure of the gas medium in the second discharging bin is higher than 10kPa-20kPa in the kiln, and the gas in the kiln is blocked from entering the second discharging bin. And after the pressurization is finished, the fourth air inlet valve is closed, then the sixth closing gate 71 is opened, and the calcined finished product in the second hearth kiln 22 is discharged and conveyed to the second discharging bin.

The second discharging bin is used as a medium and is clamped between the inner environment and the outer environment of the second hearth kiln 22, so that the inner environment and the outer environment of the discharging kiln during calcination are isolated, solid flying dust during discharging is eliminated, and discharging without stopping the kiln is realized. That is, after the calcination of the second kiln 22 in the double-kiln is completed, the first kiln 21 can directly perform the calcination without waiting for the completion of the discharge of the second kiln 22. When the first hearth kiln 21 is calcined, an inlet of the second intermediate discharging bin mechanism 7 is communicated with an outlet of the second hearth kiln 22, and an outlet of the second intermediate discharging bin mechanism 7 is disconnected from the external environment, so that the calcined finished product is conveyed to the second intermediate discharging bin mechanism 7 from the outlet of the second hearth kiln 22. By the aid of the mode, time for waiting for discharging the second hearth kiln 22 can be reduced, time for stopping the kiln during reversing is reduced, and accordingly production efficiency is improved.

When the second hearth kiln 22 discharges materials to the second discharge bin, the fourth air inlet pipe pressurizes the second discharge bin to a pressure higher than the pressure in the second hearth kiln 22, SO that the flue gas in the second hearth kiln 22 is sealed by a high-pressure environment, and NOx and SO are prevented₂And the smoke overflows from the kiln bottom, so that the investment of smoke pumping equipment at the kiln bottom can be reduced.

As feasible, the side wall of the second discharging bin is wound with a second cooling pipe, and cooling fluid is introduced into the second cooling pipe, so that the calcined finished product in the second discharging bin can be cooled. When the fourth level indicator detects that the material in the second discharging bin meets the preset amount, the discharging is finished, and then the sixth closing gate 71 is closed. And then, introducing cooling fluid into the second cooling pipe, performing heat exchange between the cooling fluid and the high-temperature calcined finished product in the second discharging bin by using the cooling fluid, and after the temperature of the calcined finished product is reduced to be below 100 ℃, opening the eighth closed gate 72, and unloading the calcined finished product in the second discharging bin to the lower belt 3 for carrying away. Through the mode, the finished product cooling and the unloading progress accelerating can be accelerated.

The second intermediate discharge bin mechanism 7 may include a fourth exhaust duct that can communicate with the second discharge bin. A fourth exhaust valve may be mounted on the fourth exhaust pipe. The fourth exhaust pipe is used for exhausting the coal gas or the high-pressure gas mixed from the second hearth kiln 22 in the second discharging bin. The fourth exhaust pipe may be connected to a dust removal system to remove dust from the exhaust gas. Likewise, to ensure regular maintenance and cleaning of the interior of the second discharge bin, a fourth hand hole may be provided in the cylindrical sidewall of the second discharge bin, for example, the fourth hand hole may be sized between DN200mm and DN300mm to ensure use requirements.

The application also provides an operation method for any one of the double-chamber lime kilns, which can comprise the following steps:

when the second hearth kiln 22 is calcined, the inlet of the first intermediate discharging bin mechanism 6 is communicated with the outlet of the first hearth kiln 21, and the outlet of the first intermediate discharging bin mechanism 6 is disconnected so as to convey the finished quick lime in the first hearth kiln 21 to the first intermediate discharging bin mechanism 6. In this step, after first thorax 21 calcines and accomplishes, second thorax 22 can calcine at once, when second thorax 22 calcines, carry out the finished product quick lime in first thorax 21 to first middle feed bin mechanism 6 through above-mentioned method, at this in-process, because first middle feed bin mechanism 6 is with external world partition, the high temperature high pressure flue gas that produces when second thorax 22 calcines enters into first thorax 21 after, can not follow first thorax 21 and spout to the export of first middle feed bin mechanism 6, cause the accident. In this step, the first intermediate discharging bin mechanism 6 may be pressurized by the third air inlet pipe 62, so that the gas in the first chamber kiln 21 is sealed from flowing downwards when the finished quicklime is conveyed to the first intermediate discharging bin mechanism 6.

After the finished product quick lime in the first hearth kiln 21 is conveyed to the first intermediate discharging bin mechanism 6, the inlet of the first intermediate discharging bin mechanism 6 is disconnected from the outlet of the first hearth kiln 21, and the outlet of the first intermediate discharging bin mechanism 6 is opened to discharge the finished product quick lime in the first intermediate discharging bin mechanism 6. At the moment, because the inlet of the first intermediate discharging bin mechanism 6 is disconnected with the outlet of the first hearth kiln 21, the discharging process is safe when the discharging process is carried out to the outside through the outlet of the first intermediate discharging bin mechanism 6, the whole discharging process does not need to be stopped for waiting, the second hearth kiln 22 can directly enter the calcining process, the discharging waiting time is saved, and the production efficiency is improved.

While the second chamber kiln 22 is conducting calcination, the inlet of the first charging bin mechanism 4 is communicated with the first outlet 11 of the material distributing mechanism 1, and the outlet of the first charging bin mechanism 4 is disconnected from the inlet of the first chamber kiln 21, so that limestone is conveyed from the first outlet 11 of the material distributing mechanism 1 into the first charging bin mechanism 4. In this step, the second chamber 22 can be calcined immediately after the first chamber 21 is calcined, and the loading operation of the first hopper mechanism 4 is completed by the above method without affecting the unloading operation of the first chamber 21 when the second chamber 22 is calcined. In the process, because the first loading bin mechanism 4 is separated from the first hearth kiln 21, high-temperature and high-pressure flue gas generated during the calcination in the second hearth kiln 22 cannot be ejected from the first hearth kiln 21 to the inlet of the first loading bin mechanism 4 after entering the first hearth kiln 21, so that accidents are caused. As a possibility, after the limestone is fed into the first hopper mechanism 4, the inlet of the first hopper mechanism 4 is disconnected from the first outlet 11 of the material distribution mechanism 1, and the first hopper 42 can be pressurized by the first intake duct 43.

During or after the calcination in the second chamber kiln 22, the outlet of the first charging bin mechanism 4 is communicated with the inlet of the first chamber kiln 21 so that the limestone in the first charging bin mechanism 4 is conveyed into the first chamber kiln 21. This step needs to be executed after the finished quick lime in the first hearth kiln 21 is conveyed to the first intermediate discharging bin mechanism 6, so as to ensure that the finished quick lime in the first hearth kiln 21 is discharged.

After the limestone is conveyed to the first kiln 21, the first kiln 21 is calcined. In this step, after the second kiln 22 has been calcined, the limestone is conveyed to the first kiln 21, and then the first kiln 21 can be immediately calcined without waiting for the discharge of the finished quicklime in the second kiln 22.

When the first hearth kiln 21 is calcined, the inlet of the second intermediate discharging bin mechanism 7 is communicated with the outlet of the second hearth kiln 22, and the outlet of the second intermediate discharging bin mechanism 7 is disconnected so as to convey the finished quick lime in the second hearth kiln 22 to the second intermediate discharging bin mechanism 7. In this step, after second thorax kiln 22 calcines and accomplishes, first thorax kiln 21 can calcine at once, when first thorax kiln 21 calcines, carry the finished product quick lime in the second thorax kiln 22 to the second in the middle of the discharge bin mechanism 7 through above-mentioned method, at this in-process, because discharge bin mechanism 7 is cut off with the external world in the middle of the second, the high temperature high pressure flue gas that produces when first thorax kiln 21 calcines enters into second thorax kiln 22 after, can not follow second thorax kiln 22 and spout to the export of discharge bin mechanism 7 in the middle of the second, cause the accident. In this step, the second intermediate discharging bin mechanism 7 may be pressurized by a fourth intake pipe, so that the gas inside the second chamber kiln 22 is sealed from flowing downward when the finished quicklime is conveyed to the second intermediate discharging bin mechanism 7.

After finished product quick lime in the second hearth kiln 22 is conveyed to the second middle discharging bin mechanism 7, the inlet of the second middle discharging bin mechanism 7 is disconnected with the outlet of the second hearth kiln 22, and the outlet of the second middle discharging bin mechanism 7 is opened to discharge the finished product quick lime in the second middle discharging bin mechanism 7. At the moment, because the inlet of the second intermediate discharging bin mechanism 7 is disconnected with the outlet of the second hearth kiln 22, the discharging to the outside through the outlet of the second intermediate discharging bin mechanism 7 is safe, the whole discharging process does not need to stop for waiting, the first hearth kiln 21 can directly enter the calcining, the discharging waiting time is saved, and the production efficiency is improved.

While the first chamber kiln 21 is undergoing calcination, the inlet of the second charging bin mechanism 5 is communicated with the second outlet 12 of the material dividing mechanism 1, and the outlet of the second charging bin mechanism 5 is disconnected from the inlet of the second chamber kiln 22, so that limestone is conveyed from the second outlet 12 of the material dividing mechanism 1 into the second charging bin mechanism 5. In this step, the first chamber kiln 21 can be calcined immediately after the second chamber kiln 22 is calcined, and the loading operation in the second hopper mechanism 5 is completed by the above method without affecting the unloading operation of the second chamber kiln 22 when the first chamber kiln 21 is calcined. In the process, because the second charging bin mechanism 5 and the second hearth kiln 22 are separated, high-temperature and high-pressure flue gas generated during the calcination of the first hearth kiln 21 can not be ejected from the second hearth kiln 22 to the inlet of the second charging bin mechanism 5 after entering the second hearth kiln 22, thereby causing accidents. It is possible, after limestone has been fed into the second charging bin mechanism 5, to disconnect the inlet of the second charging bin mechanism 5 from the second outlet 12 of the distribution mechanism 1, which can be used for pressurising the second charging bin via a second inlet duct.

The outlet of the second charging bin mechanism 5 is communicated with the inlet of the second charging bin mechanism 22 at or after the calcination of the first chamber kiln 21 so that the limestone in the second charging bin mechanism 5 is conveyed into the second chamber kiln 22. This step needs to be executed after the finished quick lime in the first kiln 21 is conveyed to the first intermediate discharging bin mechanism 6, so as to ensure that the finished quick lime in the first kiln 21 is discharged. Therefore, the steps are continuously circulated, and the industrial production of the double-hearth lime kiln is completed.

When double-hearth limekiln in this application has first feed bin mechanism 4, second feed bin mechanism 5, goes out feed bin mechanism 6 in the middle of the first and goes out feed bin mechanism 7 in the middle of the second, can make first hearth kiln or second hearth kiln can be isolated with external environment mutually at the in-process of loading and unloading to it can go on during calcination to guarantee to load and unload, thereby need load and unload the time of unloading when saving the kiln switching-over, with this improvement production efficiency. In whole circulation production process, can not need to stop the kiln completely and wait for, accomplish whole the feeding and ejection of compact, this moment, the production efficiency of two thorax limekilns: the production efficiency is 97.9 percent, wherein the calcination time length is 12 minutes/(nitrogen purging 5s + calcination time length is 12 minutes + commutation time length is 10 s). Compared with the current 92.9 percent of production efficiency, the production efficiency is improved by 5 percent, namely the yield of the lime kiln is improved by 5 percent. When the double-hearth lime kiln is provided with any one of the first charging bin mechanism 4, the second charging bin mechanism 5, the first intermediate discharging bin mechanism 6 and the second intermediate discharging bin mechanism 7, the yield of the lime kiln can be improved, but the yield of the lime kiln can be improved by less than 5 percent.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention by this means. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A dual-chamber lime kiln, comprising:

a feed mechanism having a first outlet and a second outlet;

2. The dual-chamber lime kiln of claim 1, further comprising: the inlet of the second charging bin mechanism can be connected with the second outlet of the material distributing mechanism in a switching mode; and the inlet of the second hearth kiln can be connected with the outlet of the second charging bin mechanism in a switching mode.

3. The dual-bore lime kiln according to claim 2, wherein a first distribution cylinder is connected to an outlet of the first charging bin mechanism, the first distribution cylinder being rotatable in a horizontal direction and rotatable in a vertical direction;

4. The dual-bore lime kiln of claim 2, wherein the first charging bin mechanism comprises a first charging bin; the first air inlet pipe can be communicated with the first charging bin and is used for pressurizing the first charging bin;

5. The dual-bore lime kiln according to claim 4, wherein a first closing gate is provided at the inlet of the first charging bin mechanism; a first material level meter is arranged in the first charging bin, and when the first material level meter detects that the material in the first charging bin meets a preset amount, the first closing gate is closed;

6. The dual-chamber lime kiln of claim 2, further comprising: the inlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode, and the outlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode;

and the inlet of the second intermediate discharging bin mechanism can be connected with the outlet of the second hearth kiln in a connected-disconnected mode, and the outlet of the second intermediate discharging bin mechanism can be connected in a connected-disconnected mode.

7. The dual-bore lime kiln of claim 6, wherein the first intermediate discharge bin mechanism comprises a first discharge bin; the third air inlet pipe can be communicated with the first discharging bin and is used for pressurizing the first discharging bin;

8. The double-bore lime kiln according to claim 7, wherein a first cooling pipe is wound on the side wall of the first discharging bin, and cooling fluid is introduced into the first cooling pipe; and a second cooling pipe is wound on the side wall of the second discharging bin, and cooling fluid is introduced into the second cooling pipe.

9. The dual-bore lime kiln of claim 4, wherein the first charging bin mechanism further comprises a first exhaust pipe communicable with the first charging bin; the second charging bin mechanism further comprises a second exhaust pipe which can be communicated with the second charging bin.

10. The dual-bore lime kiln of claim 7, wherein the first intermediate discharge bin mechanism further comprises a third exhaust duct communicable with the first discharge bin; the second middle discharging bin mechanism further comprises a fourth exhaust pipe which can be communicated with the second discharging bin.

11. A method of operating a dual-chamber lime kiln as claimed in any one of claims 1 to 10, further comprising: the inlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode, and the outlet of the first intermediate discharging bin mechanism can be connected with the outlet of the first hearth kiln in a connected-disconnected mode;

the operation method comprises the following steps:

12. The method of operation of claim 11 wherein the dual-chamber lime kiln further comprises: the inlet of the second charging bin mechanism can be connected with the second outlet of the material distributing mechanism in a switching mode; the inlet of the second hearth kiln can be connected with the outlet of the second charging bin mechanism in a switching mode;

the operation method comprises the following steps: