CN214693918U - Novel lime kiln - Google Patents
Novel lime kiln Download PDFInfo
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- CN214693918U CN214693918U CN202120645113.2U CN202120645113U CN214693918U CN 214693918 U CN214693918 U CN 214693918U CN 202120645113 U CN202120645113 U CN 202120645113U CN 214693918 U CN214693918 U CN 214693918U
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Abstract
The embodiment of the utility model provides a novel lime kiln, which comprises a lime kiln body and one or more heat carrier heating devices arranged outside the lime kiln body; the heat carrier heating device comprises a fuel gas input port, an air input port and a heat carrier output port; the kiln body is connected with a heat carrier output port through a heat carrier conveying pipeline; the inner wall of the heat carrier conveying pipeline is paved with a high-temperature resistant lining. When the device is used for lime preparation, combustion flame does not exist in the kiln, but a heat carrier heating device is adopted to provide hot flue gas for the lime kiln so as to heat the raw materials in the kiln, the temperature and the pressure of the heat carrier gas can be accurately controlled, the temperature and the pressure in the lime kiln are stable, and the calcining efficiency is improved.
Description
Technical Field
The utility model relates to a chemical production technical field, concretely relates to novel lime kiln.
Background
Lime, namely calcium oxide (CaO), widely used inThe steel industry, carbide industry, alumina industry, refractory industry, etc. are also one of the necessary production raw materials for these large-scale industrial fields, for example, in the metallurgical industry, about 70 kg of lime is required for each 1 ton of steel produced. The main raw material for preparing lime is limestone, and the main component of the limestone is calcium carbonate (CaCO)3) The basic principle of lime burning is to decompose calcium carbonate in limestone into calcium oxide and carbon dioxide by means of high temperature.
The basic reaction formula for decomposing calcium carbonate in limestone into calcium oxide and carbon dioxide is CaCO3→ CaO + CO2 ≠ 1777.4kJ/kgCaCO 3. Under the condition of lime kiln heating, in order to make the reaction reach a certain reaction speed, the reaction has higher CaCO3And decomposing, wherein the calcining temperature of lime in the kiln in industrial production is kept within 1050-1250 ℃.
The lime preparation process mainly comprises preheating, calcining, cooling and discharging. The process method based on the existing lime preparation technology comprises the following steps: limestone and solid fuel are loaded into a lime kiln, or gas fuel and combustion-supporting air are fed into a kiln body for combustion through a pipeline and a combustor while the limestone is loaded into the lime kiln, and high-temperature flue gas generated after the fuel and the combustion-supporting air are mixed and combusted is used for heating and calcining the limestone; under the condition of hot flue gas calcination, limestone is heated to a certain temperature and begins to decompose, and a lime finished product is formed under the conditions of higher temperature and continuous heating; and cooling the generated lime, and discharging the lime out of the kiln to finish the production of the quick lime product.
The existing lime kiln is divided into the following components according to fuel: the method comprises a mixed combustion kiln (mainly burning solid fuels, including coke, coke powder, coal and the like) and a gas combustion kiln (mainly burning gas fuels, such as high-coke mixed gas, coke oven gas, converter gas, calcium carbide tail gas, generator gas, natural gas and the like), wherein the gas combustion kiln is more widely applied due to high lime quality; dividing according to the shape of a kiln: the method comprises a shaft kiln, a rotary kiln, a sleeve kiln, a parallel-flow heat accumulating type double-chamber shaft kiln (a Meerz kiln, also called a Meerz kiln), a Fracise kiln (Italy) and the like, wherein the annular sleeve shaft kiln and the Meerz kiln are widely applied; according to the operation mode: with operating kilns under negative pressure (e.g. annular shaft kilns) and operating kilns under positive pressure (micro-positive pressure) (e.g. parallel-flow heat accumulating type double-chamber shaft kilns)
In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art:
in the existing lime production process, although the structural form and the calcining form of lime kilns in different forms are different, the process flow and the main equipment are basically similar in structure, and the common characteristic is that a combustor mounted on a kiln body is adopted to heat and calcine mineral aggregate raw materials.
Therefore, how to uniformly heat the raw material in the lime kiln, thereby improving the productivity, is a problem to be solved.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a lime kiln for solve the problem that the productivity ratio is low that the raw materials was heated inequality and leads to in the lime kiln of prior art.
In order to achieve the above purpose, an embodiment of the present invention provides a lime kiln, including a lime kiln body and one or more heat carrier heating devices disposed outside the lime kiln body; the heat carrier heating device comprises a fuel gas input port, an air input port and a heat carrier output port; the lime kiln body is connected with the heat carrier output port through a heat carrier conveying pipeline.
The technical scheme has the following beneficial effects:
the technical scheme cancels burner structures such as necessary metal burners in the lime kiln in the prior art, and the lime kiln does not burn any more in the production process, but adopts heat carrier gas input from the outside to perform flameless heating on the mineral raw materials in the kiln. Meanwhile, the heat carrier gas is generated in the heat carrier heating device independently arranged outside the lime kiln, so that the temperature and the pressure of the heat carrier gas can be accurately controlled, the temperature and the pressure in the lime kiln are stable, the heat supply efficiency is improved, and the calcination efficiency is improved. According to actual measurement verification, when the device of the technical scheme is used for preparing lime, the calcining time is shortened by 30-50% compared with that of the prior art.
Meanwhile, the technical scheme also has the following characteristics:
1. due to uneven heat distribution in the lime kiln and difficulty in control, the problems of under-burning and high over-burning rate generally exist in the prior art, the under-burning means that part of calcium carbonate in mineral aggregate is not decomposed, and the over-burning means that calcium silicate is generated by the reaction of a lime finished product and silicon in mineral aggregate impurities, which seriously affects the quality of the lime finished product and causes the reduction of lime activity. After the technical scheme of the application is adopted, the mode of controlling the temperature and the pressure outside the kiln is adopted, so that the heat carrier gas entering the kiln can stably heat the raw material, the calcining quality of lime is improved, high-grade lime finished products are obtained, and the under-burning rate and the over-burning rate are greatly reduced.
2. The method is limited by the space and the environment in the lime kiln, and the condition of sufficient combustion compensation generally exists when a metal burner is adopted for combustion in the lime kiln in the prior art, so that the fuel utilization rate is low; if the technical scheme is adopted, the heat carrier heating device independently configured outside the lime kiln is adopted, so that the full combustion of the fuel can be realized, and the fuel utilization rate is substantially improved.
3. In the prior art, in order to improve the productivity and the calcination quality, converter gas or coke oven gas or other high-calorific-value fuels with high price are needed; the device adopting the technical scheme can use blast furnace gas with lower heat value and low price as fuel, thereby greatly reducing the fuel cost of the running of the lime kiln.
4. The actual measurement proves that when the technical scheme is adopted, if air or gas phase with low CO2 content is selected as the heat carrier gas, the limestone calcining temperature can be reduced, the efficiency is further improved, and the energy consumption is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a system configuration diagram of a lime kiln according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a lime kiln according to an embodiment of the present invention;
reference numerals: 1. a lime kiln body; 101. a preheating section; 102. a calcination section; 103. a cooling section; 2. a heat carrier heating device; 201. a gas input port; 202. an air input port; 203. a heat carrier outlet; 204. a heat carrier delivery conduit; 3. a heat exchanger; 301. a gas input port of the heat exchanger; 302. a heat exchanger air input; 303. a gas outlet; 304. an air outlet; 305. a heat exchange medium input port; 306. a heat exchange medium output port; 4. a dust remover; 401. a dust collector input port; 402. an output port of the dust remover; 5. a discharge fan; 6. a feeding device; 7. an ash discharging device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a lime kiln, including: the lime kiln comprises a lime kiln body 1 and one or more heat carrier heating devices 2 arranged outside the lime kiln body 1; the heat carrier heating device 2 comprises a fuel gas input port 201, an air input port 202 and a heat carrier output port 203; the lime kiln body 1 is connected with the heat carrier output port 203 through a heat carrier conveying pipeline 204.
The common characteristic of the existing limekilns is that a burner system is required to be configured, generally, the limekilns are composed of a plurality of rows and groups of burner distributions (including a central burner), and are configured with a gas fuel pipeline, a combustion air pipeline, a nozzle and the like. At present, no matter how to optimize the arrangement form of the combustor, better production efficiency is difficult to obtain, so that the method for calcining the flame in the lime kiln is not adopted, and the heat carrier burnt outside the kiln or heated is introduced into the lime kiln to be heated in a flameless mode. The heat carrier is a gas-phase carrier which has a temperature level higher than the calcining temperature before entering the kiln and can transfer the heat of the gas-phase carrier to the stone to be calcined. The design can effectively control the temperature and the pressure of the heat carrier in the lime kiln, and can ensure that the mineral raw material for preparing lime is heated uniformly, thereby improving the production efficiency. And in addition, a combustion system does not need to be arranged in the kiln, so that the effective utilization space in the lime kiln is increased to a certain extent.
Preferably, a preheating section 101, a calcining section 102 and a cooling section 103 are sequentially arranged in the lime kiln body 1 from top to bottom;
the heat carrier transport conduit is connected to the calcination section 102.
In order to reduce the manufacturing cost and have better adaptability, the kiln body of the lime kiln in the technical scheme is basically the same as the prior art, except for flameless heating, other processes are also the same as the conventional process, and therefore, three subareas of a preheating section, a calcining section and a cooling section are still arranged. The mineral raw materials are heated mainly in the calcining section to generate lime, so that the heat carrier conveying pipeline is communicated to the calcining area.
Preferably, the heat carrier heating device 2 is a heating furnace or a burner;
and a temperature control device and a pressure control device are arranged in the heat carrier heating device 2.
Different types of heat carrier heating devices can be selected according to different types of heat carrier gases. When the heat carrier heating device is a heating furnace, air can be simply heated to reach the required temperature, and then the hot air is sent into the lime kiln through a pipeline; if hot flue gas is selected as a heat carrier, a combustor can be selected as a heat carrier heating device, air and fuel gas are mixed and combusted at the moment, and after the required temperature is reached, hot flue gas generated after combustion is sent into a lime kiln.
In order to accurately control the heat carrier output temperature and the delivery pressure, a temperature control device and a pressure control device are required.
Preferably, the lime kiln body 1 is of a vertical single-chamber structure, a vertical multi-chamber structure or a rotary structure.
In order to have better adaptability, the lime kiln body is basically the same as the prior art, and the kiln body can adopt structures such as a vertical structure, a rotary structure and the like; when the vertical structure is adopted, the structure can be made into a single-chamber or multi-chamber structure.
Preferably, the lime kiln further comprises a heat exchanger 3 arranged outside the lime kiln body 1, and the heat exchanger 3 comprises a heat exchanger gas input port 301, a heat exchanger air input port 302, a gas output port 303, an air output port 304, a heat exchange medium input port 305 and a heat exchange medium output port 306; the gas output port 303 and the gas input port 201, and the air output port 304 and the air input port 202 are respectively connected by a pipeline; the heat exchange medium inlet 305 is connected with the preheating section 101 through a pipeline.
The heat carrier gas rises after being mixed with CO2 decomposed from limestone after the calcination is finished, the limestone ore charge in the preheating section is preheated, and then the cooled mixed gas is discharged out of the kiln body. In general, the exhaust gas after calcination still contains a large amount of waste heat, so a heat exchanger can be arranged outside the kiln body, and the exhaust gas is introduced into a heat exchanger to recover the rest heat. The heat exchanger is arranged at the upstream of the heat carrier heating device, air and fuel gas firstly enter the heat exchanger, and then enter the heat carrier heating device after the temperature of the air and the fuel gas is raised by absorbing the heat of the waste gas in the heat exchanger, so that the fuel requirement of heating or burning is reduced, and the energy consumption waste is reduced.
Preferably, the heat exchanger 3 is a regenerative heat exchanger or a dividing wall type heat exchanger.
The technical scheme has no special requirement on the heat exchanger and can adopt various types.
Preferably, the lime kiln further comprises a deduster 4 and the discharge fan 5, the deduster 4 comprises a deduster input port 401 and a deduster output port 402, and the deduster input port 401 is connected with the heat exchange medium output port 306 through a pipeline; the input port of the exhaust fan 5 is connected with the output port 402 of the dust remover through a pipeline, and the output port of the exhaust fan 5 is communicated with the atmosphere.
Under the action of the induced draft fan, the waste gas after the waste heat recovery treatment flows through the dust remover to be purified and finally discharged.
Preferably, the lime kiln further comprises a feeding device 6 arranged above the preheating section 101 and an ash discharging device 7 arranged below the cooling section 103.
The calcined lime product needs to be discharged from the kiln body after being cooled, so that an ash discharging device is arranged below the cooling section.
Fig. 2 is a working principle diagram of the lime kiln of the technical scheme, and the medium directions in the gas pipelines are shown in the figure.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, the invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A lime kiln, comprising: the lime kiln comprises a lime kiln body (1) and one or more heat carrier heating devices (2) arranged outside the lime kiln body; the heat carrier heating device (2) comprises a gas input port (201), an air input port (202) and a heat carrier output port (203); the lime kiln body (1) is connected with the heat carrier output port (203) through a heat carrier conveying pipeline (204).
2. The lime kiln of claim 1,
a preheating section (101), a calcining section (102) and a cooling section (103) are sequentially arranged in the lime kiln body (1) from top to bottom;
the heat carrier transport conduit is connected to the calcination section (102).
3. The lime kiln of claim 1,
the heat carrier heating device (2) is a heating furnace or a burner;
and a temperature control device and a pressure control device are arranged in the heat carrier heating device (2).
4. The lime kiln according to claim 1, characterized in that the lime kiln body (1) is of a vertical single-chamber construction, or a vertical multi-chamber construction, or a rotary construction.
5. The lime kiln according to claim 2, further comprising a heat exchanger (3) arranged outside the lime kiln body (1), the heat exchanger (3) comprising a heat exchanger gas inlet (301), a heat exchanger air inlet (302), a gas outlet (303), an air outlet (304), a heat exchange medium inlet (305) and a heat exchange medium outlet (306); the gas output port (303) is connected with the gas input port (201) through a pipeline, and the air output port (304) is connected with the air input port (202) through a pipeline; the heat exchange medium inlet (305) is connected with the preheating section (101) through a pipeline.
6. The lime kiln according to claim 5, characterized in that the heat exchanger (3) is a regenerative heat exchanger or a dividing wall heat exchanger.
7. The lime kiln according to claim 5, further comprising a precipitator (4) and a discharge fan (5), the precipitator (4) comprising a precipitator input port (401) and a precipitator output port (402), the precipitator input port (401) being piped to the heat exchange medium output port (306); an input port of the exhaust fan (5) is connected with an output port (402) of the dust remover through a pipeline, and an output port of the exhaust fan (5) is communicated with the atmosphere.
8. The lime kiln of claim 2,
the lime kiln also comprises a feeding device (6) arranged above the preheating section (101) and an ash discharging device (7) arranged below the cooling section (103).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120645113.2U CN214693918U (en) | 2021-03-30 | 2021-03-30 | Novel lime kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120645113.2U CN214693918U (en) | 2021-03-30 | 2021-03-30 | Novel lime kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214693918U true CN214693918U (en) | 2021-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120645113.2U Active CN214693918U (en) | 2021-03-30 | 2021-03-30 | Novel lime kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214693918U (en) |
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2021
- 2021-03-30 CN CN202120645113.2U patent/CN214693918U/en active Active
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