CN102261852A - Structure of lime kiln residual heat recovery device - Google Patents

Structure of lime kiln residual heat recovery device Download PDF

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Publication number
CN102261852A
CN102261852A CN2011101825366A CN201110182536A CN102261852A CN 102261852 A CN102261852 A CN 102261852A CN 2011101825366 A CN2011101825366 A CN 2011101825366A CN 201110182536 A CN201110182536 A CN 201110182536A CN 102261852 A CN102261852 A CN 102261852A
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China
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conducted
heat exchanger
limekiln
heat
waste
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CN2011101825366A
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Chinese (zh)
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CN102261852B (en
Inventor
赵钦新
鲍颖群
彭岩
李钰鑫
王云刚
苟远波
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西安交通大学
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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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
    • 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
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention relates to a structure of a lime kiln residual heat recovery device. The structure comprises a lime kiln residual heat smoke outlet, a dust removal system, a booster fan, a circulation system and a chimney which are communicated with one another, and solves the problems of low-temperature corrosion caused by smoke deposition of a lime kiln and low heat transfer coefficient between an inner wall and an outer wall of a heat exchanger pipe caused by adoption of low smoke temperature transfer and a low boiling point working medium; moreover, the residual heat of smoke of the lime kiln can be effectively recycled and is converted into electric energy, so that the utilization rate of the energy source is improved, the pollution to the environment and the waste of the energy source are reduced. Moreover, the structure has the characteristics of low investment, simple structure and stable running.

Description

The structure of a kind of limekiln waste-heat recovery device
Technical field
The invention belongs to industrial furnace residual heat and utilize technical field, be specifically related to the structure of a kind of limekiln waste-heat recovery device.
Background technology
Exist the residual heat resources that have a large capacity and a wide range in industries such as metallurgy, building materials, chemical industry, machinery, light industry and food, these waste heats are recycled, can save the energy resource consumption of China greatly, reduce the discharging of pollutant simultaneously.Building material industry is typical highly energy-consuming industry, because industry development is rapid, the waste heat of building materials stove is very abundant, available having a high potential.With the limekiln is example, and industry such as steel and iron industry, calcium carbide industry, aluminum oxide industry, refractory material all are the lime consumption rich anies influential family, because these several industries had driven the high speed development in limekiln with 20% speed increment in recent years.At present, the above limekiln of national 600t/d has 100, and the whole nation is with the speed increment in every year 10%.The large-scale active lime production line of domestic 600-1200t/d in process of production, the smog discharge temperature height is about 240~260 ℃; The dust contained flue gas granularity is big, can reach 20mm.This part fume afterheat is effectively utilized, can significantly reduce energy waste, increase the economy and the feature of environmental protection in limekiln.The scientific technological advance thinking of China, process industry such as primary study exploitation metallurgy, chemical industry and transportation etc. are the power-saving technology and the equipment in highly energy-consuming field mainly.
At present, domesticly relate generally to heat supply and generating about the limekiln UTILIZATION OF VESIDUAL HEAT IN.Utilize conduction oil as circulatory mediator, reclaim heat energy; Utilize the waste heat heating CO in limekiln 2Working medium is heated to overcritical, the pushing turbine generating.But these UTILIZATION OF VESIDUAL HEAT IN technology are not promoted by practice.And other building materials stove UTILIZATION OF VESIDUAL HEAT IN as are applied to the pure low-temperature cogeneration technology of cement kiln UTILIZATION OF VESIDUAL HEAT IN, through the development in a plurality of stages, and comparative maturity.But water draw stall cogeneration technology, development limekiln afterheat generating system.But, because the flow of limekiln waste heat, temperature, dustiness are in constantly changing, limekiln outlet flue gas particle caking property is strong, the dust-laden grain graininess is big, and has stronger corrosivity, the limekiln waste heat enters the corrosion and the abrasion that can cause heat-exchanging tube bundle in the heat exchanger, can make the heat exchanger damage inactivation when serious; Secondly, because limekiln outlet exhaust gas temperature is low, the boiling point height of steam adopts the water vapour Rankine cycle uneconomical, need to select low-boiling organic working medium, but the coefficient of heat transfer of low boiling organic working medium and inside pipe wall must improve the coefficient of heat transfer of interior low boiling working fluid of pipe and inside pipe wall far below water, could obtain the level suitable with the water coefficient of heat transfer, otherwise, can cause heat exchanger volume huge, weight is considerably beyond the heat exchanger weight that with water is the working medium circulation; The 3rd, the limekiln exit gas temperature is lower, and in order to reduce metal consumption, the outer cylinder structure that must adopt enhanced heat exchange of pipe could obtain the rational UTILIZATION OF VESIDUAL HEAT IN effect of Technological Economy.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, the object of the present invention is to provide the structure of a kind of limekiln waste-heat recovery device, solved cold end corrosion that limekiln flue gas dust stratification causes and because of adopting low cigarette temperature to change the heat exchanger tube inside and outside wall coefficient of heat transfer problem on the low side that causes with low boiling working fluid, and can effective recycling limekiln fume afterheat, be converted into electric energy, improve energy utilization rate, reduce environmental pollution and energy waste, it is little to have investment, characteristics simple in structure, stable.
In order to achieve the above object, the technical solution adopted in the present invention is:
The structure of a kind of limekiln waste-heat recovery device, comprise the high-voltage electrostatic dust separator 2 that the entering-dust mouth and the outlet of the waste heat flue 1 in limekiln 15 are conducted and are connected, the smoke inlet of superheater 3 is conducted and is connected in the dust mouth of high-voltage electrostatic dust separator 2 and the heat exchanger 16, the exhanst gas outlet of evaporimeter high temperature section 4 is conducted with the entering-dust mouth of sack cleaner 5 and is connected in the heat exchanger 16, the dust mouth of sack cleaner 5 is conducted with the import of booster fan 6 and is connected, the smoke inlet of evaporimeter low-temperature zone 7 is conducted and is connected in the outlet of booster fan 6 and the heat exchanger 16, the exhanst gas outlet of economizer 8 is conducted with the outlet of chimney 9 and circulating pump 10 respectively with air intake and is connected in the heat exchanger 16, the import of circulating pump 10 also is conducted with the venthole of condenser 11 and is connected, the steam ports of going into of condenser 11 also is conducted with the steam drain of turbine 13 and is connected, the air intake of turbine 13 is conducted with the working substance steam outlet of superheater 3 and is connected, and turbine 13 is connected with 12 in generator; Generator 12, turbine 13, condenser 11, circulating pump 10 and heat exchanger 16 constitute the circulatory system, and the cycle fluid 14 in the described circulatory system is R113, and high-voltage electrostatic dust separator 2 and sack cleaner 5 constitute dust pelletizing system in addition.
The high-voltage electrostatic dust separator 2 of described dust pelletizing system and sack cleaner 5 place before the superheater 3 respectively and after the booster fan 6.
The superheater 3 of described heat exchanger and evaporimeter high temperature section 4 are internal thread aciculiform pipe or internal thread H type finned tube, and are furnished with dynamic soot blower.
The evaporimeter low-temperature zone 7 of described heat exchanger and economizer 8 are the internal thread spiral fin coil, and are furnished with special dynamic soot blower.
Because cycle fluid of the present invention adopts R113, it is not flammable that this working medium does not have burn into, and environmental pollution is few; Boiling point is low, to the organic efficiency height of low-temperature heat source; Heat stability is good.But, because the coefficient of heat transfer of low boiling organic working medium and inside pipe wall is far below water, the present invention selects riffled tube to improve the coefficient of heat transfer of interior low boiling working fluid of pipe and inside pipe wall, and the riffled tube inwall coefficient of heat transfer is 5~6 times of light pipes, can obtain the level suitable with the water coefficient of heat transfer; Because of limekiln outlet flue gas particle caking property strong, the dust-laden grain graininess is big, easy dust stratification, therefore, the present invention is divided into two dust pelletizing system, and high cigarette warm area adopts high-voltage electrostatic dust separator 2, and low cigarette warm area adopts sack cleaner 5, the best long-term work temperature of high-voltage electrostatic dust separator 2 is 250 ℃, and allowing the highest flue gas is 350 ℃; Dust pelletizing system is carried out pre-dedusting to flue gas, reduces the superficial dust of high temperature section heat exchanger 3,4; The limekiln exit gas temperature is on the low side, belongs to low cigarette temperature UTILIZATION OF VESIDUAL HEAT IN, and therefore, heat exchanger tube need select the cast of augmentation of heat transfer to improve the fume side coefficient of heat transfer.Superheater 3 and evaporimeter high temperature section 4 are selected strong aciculiform pipe of anti-dust stratification ability or H type finned tube for use; Evaporimeter low-temperature zone 7 and economizer 8 adopt spiral fin coil; Not thorough because of high-voltage electrostatic dust separator 2 high-temperature dust removals, also there is the flue dust of some in the flue gas, superheater 3 and evaporimeter high temperature section 4 working environments are more abominable, and CaO accounts for about 50% in the soot dust granule of general limekiln, coke powder 30~40%, all the other are CaCO 3, MgO, SiO 2, Al 2O 3Deng.Free lime dust light specific gravity, viscosity is big, and hydrophily is strong, and therefore the dust dust stratification that easily hardens adopts strong aciculiform pipe of anti-dust stratification ability or H type finned tube after the moisture absorption; Simultaneously, install reasonably dynamically soot blower additional, guarantee that its heating surface heat exchange is in operation and be in good state; This invention system is simple, can effectively reclaim the limekiln fume afterheat, the efficiency of energy utilization height; Limekiln flue gas dust stratification, cold end corrosion have thoroughly been solved and because of adopting low cigarette temperature to change the inside and outside wall coefficient of heat transfer of the heat exchanger tube that causes with low boiling working fluid a series of problems on the low side; The 2.5MW TRT that reclaims 1000t/d lime rotary kiln waste heat with a cover is an example, according to utilizing calculating in 7200 hours year, year delivery 1,656 ten thousand kwh (power station is from power consumption rate 8%), calculate according to 0.6 yuan/kwh of electricity price, 993.6 ten thousand yuan of the creations of value, save 5700 tons in mark coal year, reduce 1.63 ten thousand tons of CO2 emissions.Have remarkable economical, society and environmental benefit; The structural configuration technology of this limekiln waste-heat recovery device can promote the use of fields such as the ceramic sintering, solar energy utilization, geothermal utilization of building material industry, has important popularizing application prospect, and industrialized scale is extremely huge.
Description of drawings
Accompanying drawing is an operation principle structural representation of the present invention, and wherein arrow is represented flow direction.
The specific embodiment
The present invention will be described in more detail below in conjunction with accompanying drawing.
As shown in drawings, the structure of limekiln waste-heat recovery device, comprise the high-voltage electrostatic dust separator 2 that the entering-dust mouth and the outlet of the waste heat flue 1 in limekiln 15 are conducted and are connected, the smoke inlet of superheater 3 is conducted and is connected in the dust mouth of high-voltage electrostatic dust separator 2 and the heat exchanger 16, the exhanst gas outlet of evaporimeter high temperature section 4 is conducted with the entering-dust mouth of sack cleaner 5 and is connected in the heat exchanger 16, the dust mouth of sack cleaner 5 is conducted with the import of booster fan 6 and is connected, the smoke inlet of evaporimeter low-temperature zone 7 is conducted and is connected in the outlet of booster fan 6 and the heat exchanger 16, the exhanst gas outlet of economizer 8 is conducted with the outlet of chimney 9 and circulating pump 10 respectively with air intake and is connected in the heat exchanger 16, the import of circulating pump 10 also is conducted with the venthole of condenser 11 and is connected, the steam ports of going into of condenser 11 also is conducted with the steam drain of turbine 13 and is connected, the air intake of turbine 13 is conducted with the working substance steam outlet of superheater 3 and is connected, and turbine 13 is connected with 12 in generator; Generator 12, turbine 13, condenser 11, circulating pump 10 and heat exchanger 16 constitute the circulatory system, and the cycle fluid 14 in the described circulatory system is R113, and high-voltage electrostatic dust separator 2 and sack cleaner 5 constitute dust pelletizing system in addition.The high-voltage electrostatic dust separator 2 of described dust pelletizing system and sack cleaner 5 place before the superheater 3 respectively and after the booster fan 6.The superheater 3 of described heat exchanger and evaporimeter high temperature section 4 are internal thread aciculiform pipe or internal thread H type finned tube, and are furnished with dynamic soot blower.The evaporimeter low-temperature zone 7 of described heat exchanger and economizer 8 are the internal thread spiral fin coil, and are furnished with special dynamic soot blower.
Operation principle of the present invention is: the waste heat flue 1 in limekiln 15 is delivered to high-voltage electrostatic dust separator 2 with the waste heat flue gas and carries out dedusting, subsequently the waste heat flue gas after the dedusting is sent to superheater 3 carry out overheated, then the waste heat flue gas after overheated is sent to evaporimeter high temperature section 4, by evaporimeter high temperature section 4 this waste heat flue gas is sent to sack cleaner 5 and continue dedusting, waste heat flue gas after the continuation dedusting sends to supercharging in the booster fan 6, waste heat flue gas after the supercharging sends to evaporimeter low-temperature zone 7, and evaporimeter low-temperature zone 7 sends to economizer 8 with this waste heat flue gas and discharges through chimney 9; Circulating pump 10 is delivered to cycle fluid 14 in the heat exchanger simultaneously, in heat exchanger, the heat of evaporimeter low-temperature zone 7 is passed to cycle fluid 14, produce high-pressure and high-temperature steam, this steam enters turbine 12 actings, drive generator for electricity generation, the exhaust of turbine 12 enters in the condenser 11, and the saturated liquid that comes out in the condenser 11 boosts through circulating pump 10, finishes whole circulation.

Claims (4)

1. the structure of a limekiln waste-heat recovery device, comprise the high-voltage electrostatic dust separator (2) that the entering-dust mouth and the outlet of the waste heat flue (1) of limekiln (15) are conducted and are connected, it is characterized in that: the dust mouth of high-voltage electrostatic dust separator (2) is conducted with the smoke inlet of the middle superheater (3) of heat exchanger (16) and is connected, the exhanst gas outlet of evaporimeter high temperature section (4) is conducted with the entering-dust mouth of sack cleaner (5) and is connected in the heat exchanger (16), the dust mouth of sack cleaner (5) is conducted with the import of booster fan (6) and is connected, the outlet of booster fan (6) is conducted with the smoke inlet of the middle evaporimeter low-temperature zone (7) of heat exchanger (16) and is connected, the exhanst gas outlet of economizer (8) is conducted with the outlet of chimney (9) and circulating pump (10) respectively with air intake and is connected in the heat exchanger (16), the import of circulating pump (10) also is conducted with the venthole of condenser (11) and is connected, the steam ports of going into of condenser (11) also is conducted with the steam drain of turbine (13) and is connected, the air intake of turbine (13) is conducted with the working substance steam outlet of superheater (3) and is connected, and turbine (13) is connected with generator (12) axle; Generator (12), turbine (13), condenser (11), circulating pump (10) and heat exchanger (16) constitute the circulatory system, cycle fluid (14) in the described circulatory system is R113, and high-voltage electrostatic dust separator (2) and sack cleaner (5) constitute dust pelletizing system in addition.
2. the structural configuration of limekiln according to claim 1 waste-heat recovery device is characterized in that: high-voltage electrostatic dust separator of described dust pelletizing system (2) and sack cleaner (5) place respectively superheater (3) before and booster fan (6) afterwards.
3. according to the structural configuration of claim 1 or the described limekiln of claim 2 waste-heat recovery device, it is characterized in that: superheater of described heat exchanger (3) and evaporimeter high temperature section (4) are internal thread aciculiform pipe or internal thread H type finned tube, and are furnished with dynamic soot blower.
4. according to the structural configuration of claim 1 or the described limekiln of claim 2 waste-heat recovery device, it is characterized in that: the evaporimeter low-temperature zone (7) and the economizer (8) of described heat exchanger are the internal thread spiral fin coil, and are furnished with special dynamic soot blower.
CN2011101825366A 2011-06-30 2011-06-30 Structure of lime kiln residual heat recovery device CN102261852B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104002371A (en) * 2014-04-24 2014-08-27 广东省建筑材料研究院 Technology for producing aerated concrete blocks by means of lime kiln tail gas waste heat co-production
CN108771939A (en) * 2018-07-03 2018-11-09 袁昭 A kind of coal-burning boiler flue dust minimum discharge facility of efficient waste heat recycling
US10920622B2 (en) 2017-12-13 2021-02-16 Valmet Technologies Oy Method and a system for recovering thermal energy in a system comprising a chemical recovery boiler and a lime kiln

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CN101768652B (en) * 2009-12-18 2011-05-18 南京凯盛开能环保能源有限公司 Revolving furnace flue gas waste heat power generation system and method based on high-temperature heat carrier overheating
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JP2004075779A (en) * 2002-08-13 2004-03-11 Mitsubishi Heavy Ind Ltd System for gasifying waste
CN100338424C (en) * 2004-09-30 2007-09-19 中信重型机械公司 Generating set system of simple low temperature waste heat from large size cement manufacture line in dry method, and technical process
CN201059880Y (en) * 2007-07-13 2008-05-14 南京凯盛开能环保能源有限公司 Pure middle-low-temperature waste heat power generation system of cement kiln
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104002371A (en) * 2014-04-24 2014-08-27 广东省建筑材料研究院 Technology for producing aerated concrete blocks by means of lime kiln tail gas waste heat co-production
US10920622B2 (en) 2017-12-13 2021-02-16 Valmet Technologies Oy Method and a system for recovering thermal energy in a system comprising a chemical recovery boiler and a lime kiln
CN108771939A (en) * 2018-07-03 2018-11-09 袁昭 A kind of coal-burning boiler flue dust minimum discharge facility of efficient waste heat recycling
WO2020006789A1 (en) * 2018-07-03 2020-01-09 袁昭 Facility for high-efficient waste heat recovery and ultralow smoke dust emission from coal-fired boiler

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