CN203007148U - Low-heat-value fuel lime kiln - Google Patents

Low-heat-value fuel lime kiln Download PDF

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Publication number
CN203007148U
CN203007148U CN2012207230852U CN201220723085U CN203007148U CN 203007148 U CN203007148 U CN 203007148U CN 2012207230852 U CN2012207230852 U CN 2012207230852U CN 201220723085 U CN201220723085 U CN 201220723085U CN 203007148 U CN203007148 U CN 203007148U
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CN
China
Prior art keywords
heat
gas
kiln
air
burner
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Withdrawn - After Issue
Application number
CN2012207230852U
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Chinese (zh)
Inventor
贾会平
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Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
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Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
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Priority to CN2012207230852U priority Critical patent/CN203007148U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/40Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

Abstract

The utility model relates to a low-heat-value fuel lime kiln, comprising a kiln body, a feeding system, an air supply system, combustors, regenerative burners, a control system and an exhaust emission system, wherein a pre-heating zone of the kiln body is provided with 1-5 suction beams; two layers of beam bodies are arranged on a burning zone; 1-5 beam bodies are arranged at each layer; 1-5 lower suction beams are arranged on a cooling zone; the combustors are arranged at two external sides of the kiln body; the regenerative burners are arranged at the lower parts of two ends of each beam body; each regenerative burner is composed of a heat reservoir and a nozzle; the burner is communicated with the kiln body; a gate valve is arranged on the communicated pipeline; one side of the heat reservoir is connected with the nozzle; the other side is connected with an air/waste gas pipe and a gas/waste gas pipe; the smoke outlet of each combustor is connected with the nozzle through a smoke pipeline; and high-temperature smoke generated by each combustor heats a heat accumulator in the heat reservoir. The low-heat-value fuel gas and combustion air are heated through the external combustor and the heat reservoir of each regenerative burner, so that the combustion temperature of the low-heat-value fuel is improved, the low-heat-value fuel resource is fully utilized; and the quality of a lime product is also improved.

Description

A kind of low calorie fuels limestone kiln
Technical field
The utility model belongs to building materials, chemical production equipment technical field, relates to a kind of limestone kiln, is specifically related to a kind of low calorie fuels limestone kiln.
Background technology
It is the new technology of lime production with the beam-type limekiln calcined limestone.Beam-type limekiln has the advantages such as energy consumption is low, the lime product quality is good, throughput is strong, turndown ratio is large, is widely used in the lime production of the purposes such as metallurgy, chemical industry.Calcining needs fuel to burn at calcining zone, emits heat heating calcined material.The decomposition temperature of Wingdale is 900 ℃ of left and right, and calcining temperature is generally 1000~1200 ℃.For reaching calcining temperature, produce qualified lime, need the fuel of certain calorific value.The low calorie fuels burning does not reach the temperature of requirement, and Wingdale just can not decompose; Perhaps temperature is low, and decomposition of limestone is incomplete, causes raw burn, the ropy problem of lime product.In the smelter production process, produce a large amount of blast furnace gases, be valuable fuel source, the calorific value of blast furnace gas is 3000~3400KJ, because calorific value is low, can not be directly used in calcined limestone, and a large amount of low calorie fuelss can not be fully used.Also need purchase high performance fuel and produce lime, cause the wasting of resources, affect economic benefit.
Application number is that 200810231028.0 application for a patent for invention discloses a kind of " closed type calcium carbide furnace tail gas carries out the method for active lime calcination with fuel as rotary kiln ", this patent application is take calcium carbide stove exhaust as raw material, " the clean tail gas after purifying and coke powder or coal dust are sent in the burner of rotary kiln burning system, as the fuel of lime calcining equipment; Wingdale passes through the preheating of kiln tail hot gas in shaft preheater after, and realize predecomposition, enter the firing system of rotary kiln; "." participate in cooling air and enter the rotary kiln burning as a wind, burning through the air participation of preheating has made up the low deficiency of closed calcium carbide furnace tail gas calorific value ".This patent application uses the cooling air after preheating to be combustion air, has improved temperature of combustion, but fuel gas has not been carried out preheating, still need add coal dust or the coke powder of high heating value in combustion processes.
Summary of the invention
For overcoming the deficiencies in the prior art, the utility model provides a kind of low calorie fuels limestone kiln, by heat storage type preheated fuel gas and combustion air, improves the temperature of combustion of low calorie fuels, takes full advantage of the low calorie fuels resource, improves the quality of calcination product.
The utility model low calorie fuels limestone kiln is comprised of kiln body, feed system, air feed system, Controlling System and exhaust emission system.Be provided with opening for feed, preheating zone, calcining zone, cooling zone and discharge port in the kiln body.The preheating zone is provided with 1~5 upper suction bar, and calcining zone is provided with two-layer beam body, every layer of 1~5 beam body, and cooling zone is provided with 1~5 lower suction bar, and beam body and lower suction bar are provided with the cavity of heat-eliminating medium circulation.The low calorie fuels limestone kiln is provided with combustion chamber and heat-accumulating burner, and the combustion chamber is positioned at the both sides of kiln external body, and heat-accumulating burner is positioned at the bottom at beam body two ends.Heat-accumulating burner is made of thermophore and burner, and burner is communicated with the kiln body, and connecting pipe is provided with slide valve.One side of thermophore is connected with burner, and opposite side is connected waste pipe and is connected with combustion gas with air/waste pipe, and the exhanst gas outlet of combustion chamber is connected with burner by flue.
The cross section of beam body is rectangle or matrix shape, does not get rid of the beam body of other structure.The top of beam body, bottom and side are provided with refractory insulating layer.Air/waste pipe is connected with exhaust emission system with airline respectively by T-valve, and combustion gas/waste pipe is connected with exhaust emission system with gas line respectively by T-valve.The low calorie fuels limestone kiln is provided with gas heat-exchanger and air heat exchanger, upper suction bar is connected with exhaust emission system with air heat exchanger by gas heat-exchanger, gas line is connected to the fuel gas inlet of combustion chamber by gas heat-exchanger, airline is connected to the combustion air entrance of combustion chamber by air heat exchanger.Heat storage in thermophore is spherule, honeycomb or grid body, and the material of heat storage is pottery, refractory materials or ferrous materials.Thermophore is air-Combined gas thermophore, is divided into air regenerator and regenerator gas chamber, and air regenerator is connected with air/waste pipe, and the regenerator gas chamber is connected with combustion gas/waste pipe.Air/waste pipe leads to flue gas, blowing air during preheated air for delivery of air and discharging flue gas during the thermophore accumulation of heat.Fuel gas/waste pipe is for delivery of fuel gas and discharging flue gas, and logical flue gas during the thermophore accumulation of heat leads to combustion gas during pre-heating fuel gas.
The beam body is provided with exhaust gases passes, and bottom and/or the both sides of beam body are provided with nozzle, and exhaust gases passes is communicated with nozzle, and heat-accumulating burner is connected with the exhaust gases passes of beam body.The high-temperature flue gas that heat-accumulating burner burning produces enters calcining materials in the kiln body through the nozzle ejection from the beam body of the exhaust gases passes of beam body inside.
The heat-accumulating burner of both sides, low calorie fuels limestone kiln and combustion chamber alternation, during a side heat-accumulating burner accumulation of heat, opposite side heat-accumulating burner preheated air and combustion gas and burn, the switching by slide valve and T-valve realizes switch operation.During accumulation of heat, burner is closed to the slide valve of kiln body, and the flue gas of combustion chamber is through flue, burner preheating heat storage in the thermophore, and exothermic flue gas discharges to blowdown system; Open burner when preheated air or combustion gas to the slide valve of kiln body, burner combustion is arrived respectively in air and combustion gas after the thermophore preheating.
Heat low calorie fuels gas and combustion air by the thermophore of external combustion chamber and heat-accumulating burner in the utility model low calorie fuels limestone kiln, the high-temperature flue gas calcined limestone material that fuel gas after preheating and combustion air burning produce, improved the temperature of combustion of low calorie fuels, optimized the calcining effect, the lime product of production high-quality is fully used the low calorie fuels resource.Upper suction bar is extracted combustion air and the fuel gas of smoke pre-heating combustion chamber out, further utilizes waste gas residual heat, reduces energy consumption and production costs.The space of burning and flue gas circulation is formed at calcining zone beam body bottom, is provided with push-pull valve in bottom, beam body two ends, avoids ash-laden gas to enter, and stops up heat-accumulating burner.The beam body provides the space of distribution for high-temperature flue gas, high-temperature flue gas distributes more even, is conducive to improve the quality of products.
Description of drawings
Fig. 1 is the Structure and Process schematic diagram in the utility model low calorie fuels limestone kiln;
Fig. 2 is the vertical view of kiln body in Fig. 1;
Fig. 3 is the structural representation of heat-accumulating burner;
Fig. 4 is the structural representation of beam body.
Wherein:
1-feed system, 2-kiln body, 3-upper suction bar, 4-heat-accumulating burner, 5-air/waste pipe, 6-combustion gas/waste pipe, 7-combustion chamber, 8-flue, 9-beam body, 10-lower suction bar, 11-gas heat-exchanger, 12-preheating zone, 13-thermophore, 14-burner, 15-calcining zone, 16-slide valve, 17-cooling zone, 18-discharge port, 19-air regenerator, 20-regenerator gas chamber, 21-air heat exchanger, the cavity of 22-heat-eliminating medium circulation, 23-exhaust gases passes, 24-nozzle.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated.
Embodiment 1
The utility model low calorie fuels limestone kiln is comprised of kiln body 2, feed system 1, air feed system, gas heat-exchanger 11, air heat exchanger 21, combustion chamber 7, heat-accumulating burner 4, Controlling System and exhaust emission system as shown in Figure 1.Be provided with opening for feed, preheating zone 12, calcining zone 15, cooling zone 17 and discharge port 18 in the kiln body.The preheating zone is provided with 2 upper suction bars 3, and the waste gas outlet of upper suction bar is connected to exhaust emission system by interchanger 11.Calcining zone is provided with two-layer beam body 9, and the upper strata is provided with 3 beam bodies 9, and lower floor is provided with 2 beam bodies.The beam body is slab construction, and the top of beam body, bottom and side are provided with refractory insulating layer.Cooling zone is provided with 2 lower suction bars 10, and lower suction bar pneumatic outlet is connected with heat-exchange system.Under Liang Tihe, suction bar is provided with the cavity of heat-eliminating medium circulation, and cavity is connected with the thermal oil circulating cooling system.The combustion chamber is positioned at the both sides of kiln external body, and heat-accumulating burner is positioned at the bottom at beam body 9 two ends.Heat-accumulating burner is made of thermophore 13 and burner 14, and burner is communicated with kiln body 2, and connecting pipe is provided with slide valve 16.As shown in Figure 3, thermophore is air-Combined gas interchanger, is divided into air regenerator 19 and regenerator gas chamber 20, and air regenerator is connected with air/waste pipe 5, and the regenerator gas chamber is connected with combustion gas/waste pipe 6.One side of thermophore 13 is connected with burner, and the exhanst gas outlet of combustion chamber 7 is connected with burner by flue 8.Upper suction bar 3 is connected with air heat exchanger by gas heat-exchanger 11 and is connected with exhaust emission system, gas line is connected to the fuel gas inlet of combustion chamber 7 by gas heat-exchanger, airline is connected to the combustion air entrance of combustion chamber by air heat exchanger, with fuel gas and the combustion air of the heating by the exhaust gases combustion chamber after calcined limestone.Thermophore in thermophore is ceramic honeycomb structure.Two-layer beam body 9 and heat-accumulating burner staggered arrangement, lower floor's beam body and lower heat-accumulating burner are positioned at the mid-way of the upper heat-accumulating burner of upper strata Liang Tihe.
The operation scheme in the utility model low calorie fuels limestone kiln is, both sides heat-accumulating burner 4 and combustion chamber 7 alternations, during one side heat-accumulating burner accumulation of heat, opposite side heat-accumulating burner preheated air and combustion gas and burning, switch operation is realized in the switching by burner and kiln body connecting pipe brake application plate valve 16 and the T-valve switch position.During accumulation of heat, burner is closed to the slide valve on kiln body 2 connecting pipes, and the flue gas of combustion chamber is through flue 8, burner 14 preheating heat storage in the thermophore, and exothermic flue gas discharges to blowdown system.When preheated air or combustion gas, burner combustion is arrived in air or combustion gas after the thermophore preheating, connecting pipe is to calcining zone 15 calcined limestone materials between burner and kiln body for the flue gas that burning produces, and flue gas is retracted to the blowdown system discharging by upper suction bar 3 after 12 preheating materials of preheating zone.The combustion chambers burn temperature is 1200 ℃, and flue gas is preheated to 1050 ℃ with heat storage in thermophore 13, and thermophore ℃ enters burner 14 burnings to 1200~1400 ℃ with air and gas-preheating to 950, and the thermophore exhaust temperature is<150 ℃.The commutation of both sides heat-accumulating burner 4 determines according to the temperature of thermophore discharging flue gas, and when the flue-gas temperature of discharging during higher than 150 ℃, the action by slide valve and T-valve commutates automatically.
Embodiment 2
Another embodiment of the utility model as shown in Figure 4, beam body 9 is provided with exhaust gases passes 23, and the bottom of beam body and/or both sides are provided with nozzle 24, is provided with heat-eliminating medium circulation cavity 22 between the external wall of beam and exhaust gases passes, exhaust gases passes is communicated with nozzle, and heat-accumulating burner is connected with the exhaust gases passes of beam body.The high-temperature flue gas that heat-accumulating burner burning produces enters calcining materials in the kiln body via the nozzle ejection from the beam body of the exhaust gases passes of beam body inside.Its structure and operation scheme are identical with embodiment 1.

Claims (8)

1. low calorie fuels limestone kiln, formed by kiln body (2), feed system (1), air feed system, Controlling System and exhaust emission system, be provided with opening for feed, preheating zone (12), calcining zone (15), cooling zone (17) and discharge port (18) in the kiln body; Described preheating zone is provided with 1~5 upper suction bar (3), and calcining zone is provided with two-layer beam body (9), every layer of 1~5 beam body, and cooling zone is provided with 1~5 lower suction bar (10); Described beam body and lower suction bar are provided with the cavity (22) of heat-eliminating medium circulation, it is characterized in that: described low calorie fuels limestone kiln is provided with combustion chamber (7) and heat-accumulating burner (4), the combustion chamber is positioned at the both sides of kiln external body, and heat-accumulating burner is positioned at the bottom at beam body two ends; Described heat-accumulating burner is made of thermophore (13) and burner (14), and burner is communicated with kiln body (2), and connecting pipe is provided with slide valve (16); One side of thermophore (13) is connected with burner, and opposite side and air/waste pipe (5) are connected waste pipe (6) and are connected with combustion gas, and the exhanst gas outlet of described combustion chamber (7) is connected with burner (4) by flue (8).
2. low calorie fuels according to claim 1 limestone kiln, it is characterized in that: described air/waste pipe (5) is connected with exhaust emission system with airline respectively by T-valve, and described combustion gas/waste pipe (6) is connected with exhaust emission system with gas line respectively.
3. low calorie fuels according to claim 1 limestone kiln, it is characterized in that: described low calorie fuels limestone kiln is provided with gas heat-exchanger (11) and air heat exchanger (21), upper suction bar (3) is connected 21 by gas heat-exchanger (11) with air heat exchanger) be connected with exhaust emission system, gas line is connected to the fuel gas inlet of combustion chamber (7) by gas heat-exchanger, airline is connected to the combustion air entrance of combustion chamber by air heat exchanger.
4. low calorie fuels according to claim 1 limestone kiln, it is characterized in that: the heat storage in described thermophore is spherule, honeycomb or grid body, the material of described heat storage is pottery, refractory materials or ferrous materials.
5. low calorie fuels according to claim 1 limestone kiln, it is characterized in that: described thermophore is air-Combined gas interchanger, be divided into air regenerator (19) and regenerator gas chamber (20), air regenerator is connected with air/waste pipe (5), and the regenerator gas chamber is connected with combustion gas/waste pipe (6).
6. low calorie fuels according to claim 1 limestone kiln, it is characterized in that: the cross section of described beam body (9) is rectangle or matrix shape.
7. low calorie fuels according to claim 1 limestone kiln, it is characterized in that: described beam body (9) is provided with exhaust gases passes (23), the bottom of beam body and/or both sides are provided with nozzle (24), and exhaust gases passes is communicated with nozzle, and described heat-accumulating burner (14) is connected with the exhaust gases passes of beam body.
8. low calorie fuels according to claim 1 limestone kiln, it is characterized in that: top, bottom and the side of described beam body (9) are provided with refractory insulating layer.
CN2012207230852U 2012-12-25 2012-12-25 Low-heat-value fuel lime kiln Withdrawn - After Issue CN203007148U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012207230852U CN203007148U (en) 2012-12-25 2012-12-25 Low-heat-value fuel lime kiln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012207230852U CN203007148U (en) 2012-12-25 2012-12-25 Low-heat-value fuel lime kiln

Publications (1)

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CN203007148U true CN203007148U (en) 2013-06-19

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102992660A (en) * 2012-12-25 2013-03-27 石家庄新华能源环保科技股份有限公司 Low-heat value fuel lime kiln
CN104119003A (en) * 2014-07-04 2014-10-29 石家庄新华能源环保科技股份有限公司 Heat accumulating type dividing-wall heating industrial furnace
CN104119008A (en) * 2014-07-09 2014-10-29 石家庄新华能源环保科技股份有限公司 Device using flue gas calcining for production of lime
CN104864707A (en) * 2014-12-19 2015-08-26 武汉艾蒙窑炉技术有限公司 Shaft kiln for calcining loose materials
CN105300094A (en) * 2015-11-20 2016-02-03 赵艳枫 External combustion heat accumulating type double-beam shaft kiln
CN106186741A (en) * 2016-08-26 2016-12-07 大峘集团有限公司 Active lime BASK

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102992660A (en) * 2012-12-25 2013-03-27 石家庄新华能源环保科技股份有限公司 Low-heat value fuel lime kiln
CN102992660B (en) * 2012-12-25 2014-05-21 石家庄新华能源环保科技股份有限公司 Low-heat value fuel lime kiln
CN104119003A (en) * 2014-07-04 2014-10-29 石家庄新华能源环保科技股份有限公司 Heat accumulating type dividing-wall heating industrial furnace
CN104119003B (en) * 2014-07-04 2016-02-10 石家庄新华能源环保科技股份有限公司 The industrial furnace of heat accumulating type partition heating
CN104119008A (en) * 2014-07-09 2014-10-29 石家庄新华能源环保科技股份有限公司 Device using flue gas calcining for production of lime
CN104119008B (en) * 2014-07-09 2016-05-04 石家庄新华能源环保科技股份有限公司 Utilize flue gas calcining to produce the device of lime
CN104864707A (en) * 2014-12-19 2015-08-26 武汉艾蒙窑炉技术有限公司 Shaft kiln for calcining loose materials
CN105300094A (en) * 2015-11-20 2016-02-03 赵艳枫 External combustion heat accumulating type double-beam shaft kiln
CN106186741A (en) * 2016-08-26 2016-12-07 大峘集团有限公司 Active lime BASK

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Granted publication date: 20130619

Effective date of abandoning: 20140521