CN2656405Y - Internal-external heating lime furnace - Google Patents

Abstract

The utility model discloses an internal-external heating type limestone furnace consisting of a kiln, a feeding system, a combustion system, a delivery system, a blowdown device and a control system, wherein the combustion system is provided with a furnace rib combustion tube and a peripheral burner nozzle; a burner is arranged at the furnace rib combustion tube. The structure better solves the problem that the burner nozzle degrades in terms of quality, which is existent in a current coal-fired limestone furnace and a currern peripheral burner nozzle type limestone furnace. Further, the structure can accept a blast furnace gas with a low heat value, greatly reducing an energy waste. The utility model is characterized that the limestone positioned at the kiln center is easy to be burned completely and, the peripheral limestone doesn't present an excessive combustion, assuring the limestone quality.

Description

Lime furnace with internal and external heating

technical field

The utility model relates to an internal and external heating type lime furnace.

Background technique

At present, the existing lime kiln calcination methods mostly use coal-fired heating or use the heat generated by gas combustion in the surrounding burners to heat. Both kinds of lime kilns have certain defects. Coal mixed with limestone is likely to pollute the lime and reduce the quality of the lime. However, in the process of calcining limestone in a lime kiln that uses surrounding burners to burn coal gas, due to the limited length of the flame of the burner, if the internal size of the kiln body is too large , the flame cannot reach the center, which will easily cause the lime in the center of the kiln body to fail to burn through, or the peripheral lime to burn too much to reduce the quality of the lime.

Contents of the invention

In order to solve the above technical problems, the purpose of this utility model is to provide an internal and external heating lime furnace with simple structure, sufficient combustion and guaranteed lime quality.

The technical solution adopted by the present invention to solve the above technical problems is: an internal and external heating lime furnace, which is composed of a kiln body, a feeding system, a combustion system, a discharge system, a sewage device, and a control system. The kiln body includes a shaft kiln 1, a heat exchanger 3. Platform one 20, platform two 21, bracket one 22, bracket two 23, feeding device bracket 30, the feeding system includes inclined bridge 2, pit 11, winch 17, fixed pulley 18, redirection pulley 19, and chute 27. Feeding truck 28, kiln feeding device 29, the discharge system includes a discharge hopper 12, an electromagnetic vibration feeder 13, and the sewage system includes a dust collector 4, 1# fan 5, 2# fan 6, waste gas pipeline 8, chimney 14, Exhaust gas pipe 24, air pipe 26, combustion system mainly includes 3# fan 7, gas pipe 9, air pipe 10, furnace rebar combustion pipe 15, surrounding burners 16, air pipe 25, furnace rebar combustion pipe burner 31, 3# The fan 7 is connected to the air pipe 10, the air pipe 10 is connected to the heat exchanger 3, the furnace rebar combustion pipe 15 is inserted horizontally at the calcining position in the middle of the kiln body and evenly staggered in the horizontal position, the furnace rebar combustion pipe burner 31 is arranged on the furnace rebar On the combustion pipe 15, the peripheral burner 16 is installed on the periphery of the kiln body, and its height is close to the height of the lower floor furnace rib tube burner.

The technical progress achieved by the utility model is: the combustion system in the utility model is equipped with a furnace reinforcement combustion tube and a peripheral burner, and the structure of a furnace reinforcement combustion tube burner is arranged on the furnace reinforcement combustion tube, which solves the problem of coal burning in the past. The problem of reducing the quality of the burner caused by the type lime furnace and the peripheral burner type lime furnace occurs, and it can burn blast furnace gas with low calorific value, which greatly reduces energy waste. The lime in the center of the kiln is easy to burn through, and the lime in the periphery But burning and other characteristics ensure the quality of lime.

Description of drawings

Fig. 1 is a schematic diagram of the mechanism of the utility model;

Fig. 2 A-A direction sectional view of Fig. 1;

Fig. 3 is a sectional view taken along line B-B of Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figures 1, 2, and 3, the utility model is composed of a kiln body, a feeding system, a combustion system, a discharge system, a sewage device, and a control system. The kiln body includes a vertical kiln 1, a heat exchanger 3, and a platform 20 , platform two 21, support one 22, support two 23, feeding device support 30, the feeding system includes inclined bridge 2, pit 11, winch 17, fixed pulley 18, reversing pulley 19, chute 27, feeding cart 28 , kiln feeding device 29, the discharge system includes a discharge hopper 12, an electromagnetic vibration feeder 13, and the sewage system includes a dust collector 4, 1# blower fan 5, 2# blower fan 6, waste gas pipeline 8, chimney 14, waste gas pipeline 24, wind blower Pipe 26, the combustion system mainly includes 3# fan 7, gas pipe 9, air pipe 10, furnace rebar combustion pipe 15, peripheral burner 16, air pipe 25, furnace rebar combustion pipe burner 31, 3# fan 7 and air pipe 10 is connected, the air pipe 10 is connected with the heat exchanger 3, the rebar combustion pipe 15 is inserted horizontally at the calcining position in the middle of the kiln body and evenly staggered in the horizontal position, the rebar combustion pipe burner 31 is arranged on the furnace rebar combustion pipe 15, The peripheral burner 16 is installed on the periphery of the kiln body, and its height is close to the height of the burner of the lower floor furnace rib tube. Its working principle is as follows: firstly, the limestone is pulled by the hoist, and is pulled to the kiln roof along the inclined bridge in the feeder car, and is fed into the kiln body by the kiln feeding device, first reaches the preheating layer, and burns and decomposes in the calcination layer The generated high-temperature exhaust gas is preheated under the preheating, and the calcined lime is continuously falling to be screened by the vibrating feeder, and supplied to the transportation equipment by the discharge hopper. The material layer in the kiln body is also continuously falling due to the continuous production and transportation of lime. The limestone in the preheating layer descends to the calcining layer for calcination, and the calcined lime descends to the ash discharge layer to be transported away. The waste gas continues to burn after preheating the limestone. The combustion-supporting air and gas are preheated in the heat exchanger, and finally the dust is removed and discharged through the chimney, and the finished lime is continuously produced with the continuous circulation. But whether a lime kiln can produce qualified lime or not, besides having good raw materials, the combustion system plays a decisive role, and whether a lime kiln can save energy also depends on whether its combustion system is reasonable, so the combustion system is a lime kiln Core. The combustion system of the present utility model is such that gas (including blast furnace gas, coke oven gas, mixed gas, producer gas, converter gas, natural gas) passes through the gas pipeline through the heat exchanger 3 and high-temperature waste gas for heat exchange, and the combustion-supporting air passes through After the 3# fan 7 is pressurized, it enters the heat exchanger through the air pipe 25 to exchange heat with the high-temperature exhaust gas, and the gas with increased temperature and the combustion-supporting air enter the furnace bar combustion pipe through the combustion-supporting air pipe 10 and the gas pipe 9 respectively (a total of 5 The upper three and the lower two are inserted horizontally at the calcining position in the middle of the kiln body, and are evenly staggered in the horizontal position) 15 and peripheral burners 16 (8 sets in total, installed at the same height as the lower furnace rib tube burner, installed around the kiln body ), air and coal gas lead to the furnace reinforcement combustion pipe 15 and the peripheral burner 16 respectively, and the air and coal gas leading to the furnace reinforcement combustion pipe 15 lead to each burner 31 of the furnace reinforcement combustion pipe 15 by its internal gas and air passage Under the uniform mixing of the burner, a strong combustion reaction is carried out, and a large amount of reaction heat is released. Because the temperature in the kiln body is very high, reaching above 1150 degrees, especially near the burner, in order to ensure the normal operation of the furnace rebar combustion tube, the furnace rebar combustion tube is designed. There is a cooling channel (which can be water-cooled or oil-cooled) to reduce the temperature of the combustion tube of the furnace bar to ensure its normal operation. At the same time, the gas and air leading to the surrounding burners are also burned violently under the action of the surrounding burners, releasing a lot of heat, heating the limestone in the kiln body, and decomposing it into lime and carbon dioxide. Due to the use of the furnace rib combustion tube, the fire points are evenly distributed on the cross-section of the kiln body, and the limestone in the kiln body is evenly heated to achieve uniform calcination of the limestone cross-section, and the auxiliary calcination function of the surrounding burners makes the calcination in the furnace body The temperature of the layer is uniform, and the limestone is completely decomposed, which prevents the central part from being burnt through or the peripheral lime from being overburned, improves the quality of the finished lime, and makes full use of heat to save energy.

Claims (1)

1, interior external heating type limestone kiln, by the kiln body, feeder system, firing system, discharge system, blowdown apparatus, Controlling System constitutes, the kiln body comprises shaft furnace (1), interchanger (3), platform one (20), platform two (21), support one (22), support two (23), feeding device support (30), feeder system comprises skew bridge (2), melt pit (11), elevator (17), fixed pulley (18), changed course pulley (19), skewed slot (27), truck (28), kiln feeding device (29), discharge system comprises discharge bucket (12), electromagnetic shock feeding machine (13), drainage comprises fly-ash separator (4), 1# blower fan (5), 2# blower fan (6), exhaust pipeline (8), chimney (14), exhaust pipeline (24), airduct (26), it is characterized in that: described firing system mainly comprises 3# blower fan (7), gas line (9), airduct (10), combustion tube of furnace beam (15), periphery burner (16), airduct (25), combustion tube of furnace beam burner (31), 3# blower fan (7) links to each other with airduct (10), airduct (10) is communicated with interchanger (3), combustion tube of furnace beam (15) is horizontal to be inserted in calcining position, kiln body middle part and evenly to stagger on level attitude, combustion tube of furnace beam burner (31) is distributed on the combustion tube of furnace beam (15), periphery burner (16) is installed in kiln body periphery, and its height is approaching with lower floor furnace ribbed tube burner height.

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