CN103836899A - Process for utilizing waste heat of clustering intermittent-type refractory brick drying kiln - Google Patents

Process for utilizing waste heat of clustering intermittent-type refractory brick drying kiln Download PDF

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Publication number
CN103836899A
CN103836899A CN201410096931.6A CN201410096931A CN103836899A CN 103836899 A CN103836899 A CN 103836899A CN 201410096931 A CN201410096931 A CN 201410096931A CN 103836899 A CN103836899 A CN 103836899A
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kiln
temperature
waste heat
heat
refractory brick
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CN201410096931.6A
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CN103836899B (en
Inventor
张志祥
莫瑛
陈卉
周佑元
魏炜
赵庆
郑腾腾
张志辉
王中正
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Sinosteel Wuhan Safety & Environmental Protection Research Institute Co Ltd
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Sinosteel Wuhan Safety & Environmental Protection Research Institute Co Ltd
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Abstract

The invention relates to a process for utilizing waste heat of a clustering intermittent-type refractory brick drying kiln. The process includes the steps of high-temperature waste heat utilization, electrical heating, low-temperature waste heat utilization, forced cooling, next circulation and the like. According to the process, physical sensible heat released in the cooling stage of a kiln body and refractory bricks is recycled through the waste heat recycling technology and used for preheating a cold kiln body and cold green bricks just beginning to be heated, then smoke exhausted after the preheating process is used for heating water, and therefore the purpose of fully utilizing the waste heat is achieved.

Description

Cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique
Technical field
The present invention relates to a kind of cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique.
Background technology
The refractory material such as magnesia carbon brick, light-weight brick that steel industry uses is at present generally that batching is compressing, then forms through approximately 220 ℃ of low temperature drying processing.Drying process is divided into intensification, insulation and three processes of cooling.The dry Electric heating that adopts heats, and consumes a large amount of electric energy.The operation of the each kiln of existing dry kiln property independent periods, belongs to batch (-type) firing equipment, opens fire door natural heat dissipation and be cooled to kiln discharge temperature (as shown in Figure 1) after finishing arid cycle.According to the rough estimates of Chinese refractory material association, electric seasoning is still current main flow drying process.
The problem that existing drying process exists is as follows:
1) a large amount of physics sensible heat wastes, waste heat is not fully used, and the thermal efficiency is low;
2) natural cooling velocity is slow, production efficiency is low, utilization rate of equipment and installations is not high;
3) summer high temperature, hot flue gas is uncontrollable discharge state and is discharged in workshop, causes workshop high-temperature effect, and workman's working condition worsens;
4) waste gas, to workshop uncontrollable discharge, pollutes workshop air, affects workman healthy.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of physics sensible heat that adopts heat recovery technology recovery kiln body and refractory brick to discharge at temperature descending section is provided, be used for the cold kiln and the brindles base that just enter the section that heats up to carry out preheating, then by the cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique of the flue gas hot water discharging after preheating.
For realizing above-mentioned technical purpose, scheme provided by the invention is: a kind of cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique, comprises the steps.
Step 1, high-temperature residual heat utilization, arrives cooldown period after the operation of A kiln, by the circulating line with circulating fan, the high-temperature gas in A kiln is sent in the B of temperature raising period kiln and is carried out cycle heat exchange, until A kiln and B kiln are substantially without the temperature difference.
Step 2, electrical heating, closes the circulating line between A kiln and B kiln, and B kiln is carried out to electrical heating to the specified requirement of technique, completes heating and the insulating process of B kiln.
Step 3, low temperature heat passes into the remaining temperature in a small amount of normal temperature air adjusting A kiln in A kiln, then guides remaining wet body and gas/water-to-water heat exchanger in A kiln to carry out heat exchange by having the waste heat pipe of induced-draft fan, finally tail gas is discharged.
Step 4, forces coolingly, and A kiln temperature is spent when low, closes waste heat pipe, in A kiln, passes into normal temperature air and is discharged by cryotronl, until A kiln arrives the temperature of kiln discharge technological requirement, completes temperature reduction technology process.
Step 5, next circulation, after the operation of B kiln, to next operation kiln circulate the UTILIZATION OF VESIDUAL HEAT IN technique of aforementioned A kiln, so circulation.
And described hot-gas temperature is 220 ℃, A kiln and B kiln are 110 ℃ without the temperature of the temperature difference substantially, and the temperature that the remaining wet body in A kiln and gas/water-to-water heat exchanger carry out heat exchange is about 80 ~ 110 ℃, and the temperature that A kiln temperature is spent when low is below 80 ℃.
The present invention also provides a kind of cluster batch (-type) refractory brick dry kiln that uses above-mentioned cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique, comprise the kiln group being formed by some kilns, each kiln in described kiln group all has electric heating equipment, each kiln is communicated with by circulation pipe, waste heat pipe, cryotronl respectively, circulation pipe, waste heat pipe, cryotronl and each kiln connectivity part are equipped with valve, in circulation pipe, be provided with circulating fan, waste heat pipe is communicated with the chimney with exhaust blower after gas/water-to-water heat exchanger, and cryotronl is communicated with the chimney with induced-draft fan.
And described circulation pipe is all communicated with by Electrocontrolled tee valve door with kiln hood and the kiln tail of each kiln, described waste heat pipe, cryotronl are communicated with by two-way valve with each kiln.
Beneficial effect of the present invention is:
1, calculate by theoretical, the intensification physics caloric receptivity of brick is amounted to power consumption 38.14kWh/ ton brick, waste heat is by theoretical utilization rate 50%, brick economize on electricity 19kWh per ton, the electricity consumption unit consumption measured value of existing dry kiln is 54.67 kWh/ brick per ton, fractional energy savings=19/54.67=34.75%(note: these data are not considered the just leakage producing in waste heat recovery process: the remaining thermogenetic hot water that utilizes; Also do not consider the negative leakage producing in waste heat recovery process: as temperature raising period and catathermal correspondence etc. between the blower fan power consumption, kiln and the kiln that increase, positive and negative leakage has Contre-coup and limited on the impact of fractional energy savings);
The data that provide according to Chinese refractory material association, more than 800 ten thousand tons, this refractory brick is produced in the whole nation per year, and 15,200 ten thousand kWh that can economize on electricity amount to 5.32 ten thousand tons, mark coal, 13.26 ten thousand tons of reducing emission of carbon dioxide, approximately 1.52 hundred million yuan of economic benefits;
2, improve the operating efficiency of kiln, owing to adopting forced-convection heat transfer, kiln temperature uniformity improves temperature fall time and shortens than traditional handicraft; Owing to adopting waste heat preheating, the heating-up time shortens than traditional handicraft;
3, waste gas discharges in a organized way, has eliminated workshop thermal pollution and smoke pollution, has improved workman's working condition.
Accompanying drawing explanation
Fig. 1 is traditional refractory brick dry kiln schematic diagram.
Fig. 2 is that high-temperature residual heat of the present invention utilizes schematic diagram.
Fig. 3 is low temperature heat schematic diagram of the present invention.
Fig. 4 forces cooling schematic diagram.
Wherein, 1, circulation house steward, 2, loop exit arm, 3, Electrocontrolled tee valve door, 4, kiln, 5, cryotronl, 6, two-way valve, 7, circulating fan, 8, circulation entrance branch, 10, waste heat pipe, 11, induced-draft fan, 12, gas/water-to-water heat exchanger, 14, cooling water inlet, 15, hot water outlet.
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The present embodiment provides a kind of cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique, comprises the steps.
Step 1, high-temperature residual heat utilization, as shown in Figure 2, arrives cooldown period after the operation of A kiln, by the circulating line with circulating fan, the high-temperature gas in A kiln is sent in the B of temperature raising period kiln and is carried out cycle heat exchange, until A kiln and B kiln are substantially without the temperature difference.A kiln to B kiln, for B kiln preheating kiln body and refractory brick, to improve utilization rate of waste heat, reduces the power consumption of B kiln temperature raising period the physics sensible heat transfer of kiln body and refractory brick.
In actual motion, the cohort forming for many kilns, the cooldown period of some kiln is not necessarily just in time corresponding with the temperature raising period of other kilns, and mutual combination heat exchange is a dynamic process, and the optimization of process can by the production scheduling of science and intelligentized control device is supporting realizes.
Step 2, electrical heating, closes the circulating line between A kiln and B kiln, and B kiln is carried out to electrical heating to the specified requirement of technique, completes heating and the insulating process of B kiln.The few high-temperature flue gas of this stage amount of having, enters atmosphere through high-temperature smoke discharging pipeline, heat exchanger, chimney.
Step 3, low temperature heat as shown in Figure 3, passes into the remaining temperature in a small amount of normal temperature air adjusting A kiln in A kiln, then guides remaining wet body and gas/water-to-water heat exchanger in A kiln to carry out heat exchange by having the waste heat pipe of induced-draft fan, finally tail gas is discharged.Low temperature exhaust heat heat hot water, can live for have a bath, heating etc., and waste heat is fully used.
Step 4, forces coolingly, and as shown in Figure 4, A kiln temperature is spent when low, closes waste heat tube valve, in A kiln, passes into normal temperature air and is discharged by cryotronl, until A kiln arrives the temperature of kiln discharge technological requirement, completes temperature reduction technology process.The object of this process is to accelerate the turnover of kiln, improves stove utilization rate, enhances productivity, and in an organized way discharging waste gas is conducive to reduce workshop thermal pollution and smoke pollution simultaneously, improves workman's working condition.
Step 5, next circulation, after the operation of B kiln, to next operation kiln circulation UTILIZATION OF VESIDUAL HEAT IN technique, so circulation.
Further, above-mentioned hot-gas temperature is 220 ℃, and A kiln and B kiln are 110 ℃ without the temperature of the temperature difference substantially, and the temperature that the remaining wet body in A kiln and gas/water-to-water heat exchanger carry out heat exchange is about 80 ~ 110 ℃, and the temperature that A kiln temperature is spent when low is below 80 ℃.
The present embodiment also provides a kind of cluster batch (-type) refractory brick dry kiln that uses above-mentioned cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique, comprise the kiln group being formed by some kilns 4, each kiln 4 in described kiln group all has electric heating equipment, each kiln 4 passes through respectively circulation pipe, waste heat pipe 10, cryotronl 5 is communicated with, circulation pipe, waste heat pipe 10, cryotronl 5 is equipped with valve with each kiln 4 connectivity parts, in circulation pipe, be provided with circulating fan 7, waste heat pipe 10 is communicated with the chimney with exhaust blower after gas/water-to-water heat exchanger 12, cryotronl 5 is communicated with the chimney with induced-draft fan 11.Circulation pipe comprises circulation house steward 1, loop exit arm 2, circulation entrance branch 8.
Further, above-mentioned circulation pipe is all communicated with by Electrocontrolled tee valve door 3 with kiln hood and the kiln tail of each kiln 4, and described waste heat pipe 10, cryotronl 5 are communicated with by two-way valve 6 with each kiln 4.
High-temperature residual heat utilizes process to be: in a Ge Yao group, in the time that certain A kiln arrives cooldown period, certain B kiln in temperature raising period, open the valve that A, B kiln two ends lead to circulating line, under the effect of blower fan draft, start cycle heat exchange, the temperature of A kiln is by 220 ℃ progressively to 110 ℃ of convergences, and the temperature of B kiln progressively to 110 ℃ of convergences, is passed through hot air circulation by environment temperature, A kiln to B kiln, supplies B kiln preheating kiln body and refractory brick the physics sensible heat transfer of kiln body and refractory brick.
Electrical heating process is: through cycle heat exchange, the temperature of B kiln is by progressively 110 ℃ of convergences of environment temperature, needs electricity consumption to heat to 220 ℃ and be incubated, to meet technological requirement.Now close B kiln two ends and lead to the valve of circulating line, open the valve that B kiln leads to high-temperature smoke discharging pipeline, open electrical heating, be incubated until furnace temperature rises to 220 ℃.
Low temperature heat process is: through cycle heat exchange, the temperature of A kiln is by 220 ℃ of 110 ℃ of convergences progressively, open the valve that the cold wind shelves of A kiln two ends valve and A kiln lead to high-temperature smoke discharging pipeline, allow cold wind enter through kiln two ends, enter atmosphere (see in Fig. 3 shown in arrow) through high-temperature smoke discharging pipeline, heat exchanger, chimney, until leave the cigarette temperature drop to 80 ℃ of A kiln, this process is to utilize the low temperature exhaust heat heat hot water of 80 ℃-110 ℃, lives for have a bath, heating etc.
Pressure cooling procedure is: when the temperature of A kiln is by 110 ℃ of 80 ℃ of convergences progressively, there is no value, now open the valve that A kiln leads to low-temperature smoke extraction pipeline, close A kiln and lead to the valve of high-temperature smoke discharging pipeline, allow cold wind enter through kiln two ends, enter atmosphere through low-temperature smoke extraction pipeline, chimney, until the cigarette temperature drop that leaves A kiln is to kiln discharge technological requirement temperature, brick finished product kiln discharge.
The above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvement or distortion; comprise the improvement that traditional drying kiln is carried out according to the present invention, these improvement or distortion also should be considered as protection scope of the present invention.

Claims (4)

1. a cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique, comprises the steps:
Step 1, high-temperature residual heat utilization, arrives cooldown period after the operation of A kiln, by the circulating line with circulating fan, the high-temperature gas in A kiln is sent in the B of temperature raising period kiln and is carried out cycle heat exchange, until A kiln and B kiln are substantially without the temperature difference;
Step 2, electrical heating, closes the circulating line between A kiln and B kiln, and B kiln is carried out to electrical heating to the specified requirement of technique, completes heating and the insulating process of B kiln;
Step 3, low temperature heat passes into the remaining temperature in a small amount of normal temperature air adjusting A kiln in A kiln, then guides remaining wet body and gas/water-to-water heat exchanger in A kiln to carry out heat exchange by having the waste heat pipe of induced-draft fan, finally tail gas is discharged;
Step 4, forces coolingly, and A kiln temperature is spent when low, closes waste heat pipe, in A kiln, passes into normal temperature air and is discharged by cryotronl, until A kiln arrives the temperature of kiln discharge technological requirement, completes temperature reduction technology process;
Step 5, next circulation, after the operation of B kiln, to next operation kiln circulation UTILIZATION OF VESIDUAL HEAT IN technique, so circulation.
2. cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1, it is characterized in that: described hot-gas temperature is 220 ℃, A kiln and B kiln are 110 ℃ without the temperature of the temperature difference substantially, the temperature that remaining wet body in A kiln and gas/water-to-water heat exchanger carry out heat exchange is about 80 ~ 110 ℃, and the temperature that A kiln temperature is spent when low is below 80 ℃.
3. one kind uses the cluster batch (-type) refractory brick dry kiln of cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique as claimed in claim 1, comprise the kiln group being formed by some kilns, it is characterized in that: the each kiln in described kiln group all has electric heating equipment, each kiln is communicated with by circulation pipe, waste heat pipe, cryotronl respectively, circulation pipe, waste heat pipe, cryotronl and each kiln connectivity part are equipped with valve, in circulation pipe, be provided with circulating fan, waste heat pipe is communicated with the chimney with exhaust blower after gas/water-to-water heat exchanger, and cryotronl is communicated with the chimney with induced-draft fan.
4. cluster batch (-type) refractory brick dry kiln according to claim 3, is characterized in that: described circulation pipe is all communicated with by Electrocontrolled tee valve door with kiln hood and the kiln tail of each kiln, and described waste heat pipe, cryotronl are communicated with by two-way valve with each kiln.
CN201410096931.6A 2014-03-18 2014-03-18 Cluster batch (-type) refractory brick dry kiln UTILIZATION OF VESIDUAL HEAT IN technique Active CN103836899B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109654896A (en) * 2019-01-04 2019-04-19 孟津青城古建制品有限公司 A kind of application method of the hot cigarette circulation recycling device for brickmaking
CN112611213A (en) * 2020-12-19 2021-04-06 安徽龙鼎家居工贸有限公司 Airflow circulating equipment for drying kiln

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0443286A (en) * 1990-06-06 1992-02-13 Murata Mfg Co Ltd Continuous baking furnace
CN2569067Y (en) * 2002-09-23 2003-08-27 邹文浩 Energy saving batch car type kiln
US20100122533A1 (en) * 2008-11-20 2010-05-20 Kalex, Llc Method and system for converting waste heat from cement plant into a usable form of energy
CN101818993A (en) * 2010-04-29 2010-09-01 山东新阳能源有限公司 Fast cooling and residual-heat utilization method of baked brick furnace
CN102878808A (en) * 2012-10-26 2013-01-16 赵树壮 Series connection industrial kiln

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0443286A (en) * 1990-06-06 1992-02-13 Murata Mfg Co Ltd Continuous baking furnace
CN2569067Y (en) * 2002-09-23 2003-08-27 邹文浩 Energy saving batch car type kiln
US20100122533A1 (en) * 2008-11-20 2010-05-20 Kalex, Llc Method and system for converting waste heat from cement plant into a usable form of energy
CN101818993A (en) * 2010-04-29 2010-09-01 山东新阳能源有限公司 Fast cooling and residual-heat utilization method of baked brick furnace
CN102878808A (en) * 2012-10-26 2013-01-16 赵树壮 Series connection industrial kiln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109654896A (en) * 2019-01-04 2019-04-19 孟津青城古建制品有限公司 A kind of application method of the hot cigarette circulation recycling device for brickmaking
CN112611213A (en) * 2020-12-19 2021-04-06 安徽龙鼎家居工贸有限公司 Airflow circulating equipment for drying kiln

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