Drying device utilizing waste heat of tail gas of lime kiln

Abstract

The utility model relates to the technical field of carbon material drying, in particular to a drying device utilizing waste heat of tail gas of a lime kiln. A drying device utilizing waste heat of tail gas of a lime kiln comprises a heat supply unit, a feeding unit, a vertical drying kiln and a tail gas treatment unit, a gas outlet of the heat supply unit and a discharge port of the feeding unit are respectively connected with the vertical drying kiln, and a gas outlet of the vertical drying kiln is connected with the tail gas treatment unit. According to the utility model, the tail gas of the lime kiln and the hot air in the combustion chamber are mixed into the drying gas through the air mixing chamber, so that the carbon material is dried, the fuel consumption of the fluidized bed furnace can be reduced, the carbon material can be fully dried, and the breakage rate of the carbon material is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon material drying, in particular to a drying device utilizing waste heat of tail gas from a lime kiln. Background Art

[0002] Tail gas recycling is an important way to improve economic efficiency and save fuel. Energy saving and consumption reduction is a long-term strategic task for chemical companies. Fully recycling and utilizing these energies is one of the signs of the modernization level of enterprises. The raw materials required for the production of calcium carbide furnaces are lime and dried carbon materials. The vertical drying kiln is mainly responsible for drying the carbon materials with a moisture content of about 16% entering the site, ensuring that the moisture content after drying is less than 1%, and providing them to the calcium carbide furnace.

[0003] The traditional drying method is to use a rotary drying drum for drying. During the drying process, the moisture content is difficult to control, and the required heat is large and the air volume is small, resulting in a high breakage rate. The vertical drying kiln requires low heat and high air volume to dry the carbon materials during the production process, which can ensure the drying efficiency while reducing fuel consumption. Utility Model Content

[0004] The utility model aims to provide a drying device which utilizes the waste heat of lime kiln tail gas to solve the problem of excessive fuel consumption in drying carbon materials.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A drying device utilizing waste heat of tail gas from a lime kiln, comprising a heat supply unit, a feeding unit, a vertical drying kiln and a tail gas treatment unit, wherein the air outlet of the heat supply unit and the material outlet of the feeding unit are respectively connected to the vertical drying kiln, and the air outlet of the vertical drying kiln is connected to the tail gas treatment unit;

[0007] The heat supply unit includes an exhaust gas fan, a positive pressure fan, a pulverized coal tank and a fluidized bed furnace. The fluidized bed furnace includes a combustion chamber, an air mixing chamber and a slag bin. The air outlet of the combustion chamber is connected to the air inlet of the air mixing chamber, the discharge port of the combustion chamber is connected to the slag bin, the air outlet of the air mixing chamber is connected to the air inlet of the vertical drying kiln, the air inlet of the exhaust gas fan is connected to the lime kiln through a pipeline for conveying the lime kiln exhaust gas, the air outlet of the exhaust gas fan is communicated with the air mixing chamber, the air inlet of the positive pressure fan is connected to the purified ash bin through a pipeline for conveying combustible dust, the air outlet of the positive pressure fan is connected to the combustion chamber, and the discharge port of the pulverized coal tank is connected to the combustion chamber;

[0008] The feeding unit comprises a kiln front bin and a feeding high-angle belt, the discharge port of the kiln front bin is connected to the feeding port of the feeding high-angle belt, and the discharge port of the feeding high-angle belt is connected to the feeding port of the vertical drying kiln;

[0009] The tail gas treatment unit comprises a cyclone dust collector, a drying dust collector, an induced draft fan and a chimney which are connected in sequence, and the air inlet of the cyclone dust collector is connected to the air outlet of the vertical drying kiln.

[0010] A further technical solution is to provide a disc feeder between the pulverized coal tank and the combustion chamber.

[0011] A further technical solution is to further include a blower, wherein the blower is connected to the combustion chamber through an air distribution pipe.

[0012] A further technical solution is to provide a plurality of belt scales between the kiln front bin and the feeding high-angle belt.

[0013] A further technical solution is to further include a dry charcoal ash bin, which is connected to the discharge port of the cyclone dust collector.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model mixes the lime kiln exhaust and the hot air in the combustion chamber into drying gas through the arranged air mixing chamber, thereby achieving the drying of the carbon material, thereby reducing the fuel consumption of the boiling furnace, and also enabling the carbon material to be fully dried, thereby reducing the breakage rate of the carbon material. When a variety of carbon materials need to be dried, they can be weighed separately by using a belt scale. By arranging a blower and an air distribution duct, the temperature of the fuel during combustion can be reduced, ensuring that the fuel can be fully burned and reducing nitrogen oxides generated due to incomplete combustion. The arranged dry carbon ash bin can collect large-particle carbon materials in the drying gas intercepted by the cyclone dust collector, thereby enabling these large-particle carbon materials to be recycled and centrally processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Icons: 1- pulverized coal tank, 2- disc feeder, 3- purified ash bin, 4- positive pressure fan, 5- boiling furnace, 501- combustion chamber, 502- air mixing chamber, 503- slag bin, 6- tail gas fan, 7- lime kiln, 8- blower, 9- vertical drying kiln, 10- kiln front bin, 11- feeding high angle belt, 12- cyclone dust collector, 13- drying dust collector, 14- induced draft fan, 15- chimney, 16- dry charcoal ash bin, 18- belt scale. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] Figure 1 This is an embodiment of the utility model.

[0020] Embodiment 1:

[0021] A drying device utilizing waste heat of tail gas from a lime kiln, characterized in that it comprises a heat supply unit, a feeding unit, a vertical drying kiln 9 and a tail gas treatment unit, wherein the air outlet of the heat supply unit and the material outlet of the feeding unit are respectively connected to the vertical drying kiln 9, and the air outlet of the vertical drying kiln 9 is connected to the tail gas treatment unit;

[0022] The heat supply unit includes an exhaust fan 6, a positive pressure fan 4, a pulverized coal tank 1 and a fluidized bed furnace 5, wherein the fluidized bed furnace 5 includes a combustion chamber 501, an air mixing chamber 502 and a slag bin 503, wherein the air outlet of the combustion chamber 501 is connected to the air inlet of the air mixing chamber 502, the discharge port of the combustion chamber 501 is connected to the slag bin 503, the air outlet of the air mixing chamber 502 is connected to the air inlet of the vertical drying kiln 9, the air inlet of the exhaust fan 6 is connected to the lime kiln 7 through a pipeline for conveying the lime kiln exhaust, the air outlet of the exhaust fan 6 is communicated with the air mixing chamber 502, the air inlet of the positive pressure fan 4 is connected to the purified ash bin 3 through a pipeline for conveying combustible dust, the air outlet of the positive pressure fan 4 is connected to the combustion chamber 501, and the discharge port of the pulverized coal tank 1 is connected to the combustion chamber 501;

[0023] The feeding unit includes a kiln front bin 10 and a feeding high-angle belt 11, the discharge port of the kiln front bin 10 is connected to the feed port of the feeding high-angle belt 11, and the discharge port of the feeding high-angle belt 11 is connected to the feed port of the vertical drying kiln 9;

[0024] The tail gas treatment unit includes a cyclone dust collector 12 , a drying dust collector 13 , an induced draft fan 14 and a chimney 15 which are connected in sequence. The air inlet of the cyclone dust collector 12 is connected to the air outlet of the vertical drying kiln 9 .

[0025] A disc feeder 2 is provided between the pulverized coal tank 1 and the combustion chamber 501 .

[0026] A plurality of belt scales 17 are provided between the kiln front bin 10 and the feeding high-angle belt 11 .

[0027] Figure 1A preferred embodiment of the utility model of a drying device utilizing the waste heat of lime kiln exhaust gas is shown. This embodiment specifically includes: when the utility model is put into use, the hot air generated by the combustion of fuel in the combustion chamber 501 enters the mixing chamber 502 through a pipe, and at the same time, the exhaust fan 6 will introduce the lime kiln exhaust gas into the mixing chamber 502 to mix with the hot air to form drying gas, and then enter the vertical drying kiln 9, and the carbon material that needs to be dried also enters the vertical drying kiln 9 under the action of the feeding high-angle belt 11. When it is necessary to dry multiple carbon materials, a belt scale 17 is required to weigh them separately. Under the action of the induced draft fan 14, the drying gas completes the drying of the carbon material, and then the drying gas passes through the cyclone dust collector 12 and the drying dust collector 13 in turn, and the drying gas is dust-removed to ensure that the drying gas discharged from the chimney 15 will not pollute the environment.

[0028] Embodiment 2:

[0029] A drying device utilizing waste heat of tail gas from a lime kiln, characterized in that it comprises a heat supply unit, a feeding unit, a vertical drying kiln 9 and a tail gas treatment unit, wherein the air outlet of the heat supply unit and the material outlet of the feeding unit are respectively connected to the vertical drying kiln 9, and the air outlet of the vertical drying kiln 9 is connected to the tail gas treatment unit;

[0030] The heat supply unit includes an exhaust fan 6, a positive pressure fan 4, a pulverized coal tank 1 and a fluidized bed furnace 5, wherein the fluidized bed furnace 5 includes a combustion chamber 501, an air mixing chamber 502 and a slag bin 503, wherein the air outlet of the combustion chamber 501 is connected to the air inlet of the air mixing chamber 502, the discharge port of the combustion chamber 501 is connected to the slag bin 503, the air outlet of the air mixing chamber 502 is connected to the air inlet of the vertical drying kiln 9, the air inlet of the exhaust fan 6 is connected to the lime kiln 7 through a pipeline for conveying the lime kiln exhaust, the air outlet of the exhaust fan 6 is communicated with the air mixing chamber 502, the air inlet of the positive pressure fan 4 is connected to the purified ash bin 3 through a pipeline for conveying combustible dust, the air outlet of the positive pressure fan 4 is connected to the combustion chamber 501, and the discharge port of the pulverized coal tank 1 is connected to the combustion chamber 501;

[0031] The feeding unit includes a kiln front bin 10 and a feeding high-angle belt 11, the discharge port of the kiln front bin 10 is connected to the feed port of the feeding high-angle belt 11, and the discharge port of the feeding high-angle belt 11 is connected to the feed port of the vertical drying kiln 9;

[0032] The tail gas treatment unit includes a cyclone dust collector 12 , a drying dust collector 13 , an induced draft fan 14 and a chimney 15 which are connected in sequence. The air inlet of the cyclone dust collector 12 is connected to the air outlet of the vertical drying kiln 9 .

[0033] A disc feeder 2 is provided between the pulverized coal tank 1 and the combustion chamber 501 .

[0034] It also includes a blower 8, which is connected to the combustion chamber 501 through an air distribution pipe.

[0035] A plurality of belt scales 17 are provided between the kiln front bin 10 and the feeding high-angle belt 11 .

[0036] It also includes a dry charcoal ash bin 16 , which is connected to the discharge port of the cyclone dust collector 12 .

[0037] Figure 1 A preferred embodiment of the utility model of a drying device utilizing the waste heat of lime kiln exhaust gas is shown. This embodiment specifically includes: when the utility model is put into use, by setting a blower 8 and an air distribution pipe, the temperature of the fuel during combustion can be reduced to ensure that the fuel can be fully burned and reduce nitrogen oxides generated by incomplete combustion. The dry charcoal ash bin 16 can collect large-particle carbon materials in the drying gas intercepted by the cyclone dust collector 12, so that these large-particle carbon materials can be recycled and centrally processed.

[0038] Although the utility model is described herein with reference to a plurality of illustrative embodiments of the utility model, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the drawings and claims disclosed herein, various modifications and improvements may be made to the components and / or layout of the subject combination layout. In addition to the modifications and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A drying device utilizing waste heat from lime kiln tail gas, characterized in that: It comprises a heat supply unit, a feeding unit, a vertical drying kiln (9) and an exhaust gas treatment unit, wherein the gas outlet of the heat supply unit and the material outlet of the feeding unit are respectively connected to the vertical drying kiln (9), and the gas outlet of the vertical drying kiln (9) is connected to the exhaust gas treatment unit; The heat supply unit comprises an exhaust fan (6), a positive pressure fan (4), a pulverized coal tank (1) and a fluidized bed furnace (5); the fluidized bed furnace (5) comprises a combustion chamber (501), an air mixing chamber (502) and a slag bin (503); the air outlet of the combustion chamber (501) is connected to the air inlet of the air mixing chamber (502); the discharge port of the combustion chamber (501) is connected to the slag bin (503); the air outlet of the air mixing chamber (502) is connected to the vertical drying kiln (9); The air inlet of the exhaust fan (6) is connected to the lime kiln (7) through a pipeline for conveying the lime kiln exhaust gas, the air outlet of the exhaust fan (6) is connected to the air mixing chamber (502), the air inlet of the positive pressure fan (4) is connected to the purified ash bin (3) through a pipeline for conveying combustible dust, the air outlet of the positive pressure fan (4) is connected to the combustion chamber (501), and the discharge port of the pulverized coal tank (1) is connected to the combustion chamber (501); The feeding unit comprises a kiln front bin (10) and a feeding high-angle belt (11), the discharge port of the kiln front bin (10) is connected to the feed port of the feeding high-angle belt (11), and the discharge port of the feeding high-angle belt (11) is connected to the feed port of the vertical drying kiln (9); The tail gas treatment unit comprises a cyclone dust collector (12), a drying dust collector (13), an induced draft fan (14) and a chimney (15) which are connected in sequence, and the air inlet of the cyclone dust collector (12) is connected to the air outlet of the vertical drying kiln (9).

2. A drying device utilizing waste heat from lime kiln tail gas according to claim 1, characterized in that: A disc feeder (2) is provided between the pulverized coal tank (1) and the combustion chamber (501).

3. A drying device utilizing waste heat of lime kiln tail gas according to claim 1, characterized in that: It also includes a blower (8), wherein the blower (8) is connected to the combustion chamber (501) via an air distribution pipe.

4. A drying device utilizing waste heat of lime kiln tail gas according to claim 1, characterized in that: A plurality of belt scales (17) are arranged between the kiln front bin (10) and the feeding high-angle belt (11).

5. A drying device utilizing waste heat of lime kiln tail gas according to claim 1, characterized in that: It also comprises a dry charcoal ash bin (16), wherein the dry charcoal ash bin (16) is connected to the discharge port of the cyclone dust collector (12).

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