CN201935588U - Flue gas waste heat recovery device for alumina gaseous suspension roaster - Google Patents

Flue gas waste heat recovery device for alumina gaseous suspension roaster Download PDF

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Publication number
CN201935588U
CN201935588U CN2011200050290U CN201120005029U CN201935588U CN 201935588 U CN201935588 U CN 201935588U CN 2011200050290 U CN2011200050290 U CN 2011200050290U CN 201120005029 U CN201120005029 U CN 201120005029U CN 201935588 U CN201935588 U CN 201935588U
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China
Prior art keywords
heat exchanger
flue gas
temperature
valve
soot blowing
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Expired - Fee Related
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CN2011200050290U
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Chinese (zh)
Inventor
涂福炳
周孑民
毛建丰
贾煜
武荟芬
马士伟
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Central South University
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Central South University
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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
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

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  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The utility model discloses a flue gas waste heat recovery device for an alumina gaseous suspension roaster. The flue gas waste heat recovery device comprises a radial heat pipe heat exchanger (1), a temperature compensator (7) and a mixer (21), wherein an air pulse soot blowing system is installed on the radial heat pipe heat exchanger (1); the air pulse soot blowing system adopts a structure that a plurality of soot blowing holes (29) are distributed on the radial heat pipe heat exchanger (1); an air inlet end of a compressed air header (30) is connected with a compressed air pipe (31); an air outlet end of the compressed air header (30) is connected with a plurality of soot blowing tubes (33) through electromagnetic valves; and the soot blowing tubes (33) are connected in the soot blowing holes (29). The flue gas waste heat recovery device for the alumina gaseous suspension roaster, which is provided by the utility model, is endowed with the functions of self-compensation of the cold fluid temperature, self-regulation of the wall temperature of the radial heat pipe heat exchanger, self-control of the flow and the temperature of the feed water as well as self-dedusting of the heat exchanger, improves the ability of dew point corrosion prevention of the radial heat pipe heat exchanger, prolongs the service life of the heat exchanger and can effectively recover waste heat in low-temperature flue gas.

Description

Aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device
Technical field
The utility model relates to a kind of Industrial Stoves low-temperature flue gas waste-heat recovery device, particularly relates to a kind of aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device.
Background technology
Aluminium hydroxide roasting is last procedure in the aluminum oxide production process, and its energy consumption accounts for about 10% of process for making alumina energy consumption.Gas suspension calcination stove technology has that overall structure is simple, automaticity is high, hear rate is low, constant product quality and be easy to advantages such as control, be that world today's alumina producing is comparatively advanced, the technology of comparative maturity, representing the developing direction of Aluminium hydroxide roasting.But still have following subject matter in the actual production: the combustion gas unit consumption is higher, and exhaust gas temperature and dump temperature are higher, causes alumina product quality instability, influences stable, the efficient operation of alumina producing.
Test result shows that therefore the heat ratio that the gas suspension calcination kiln gas is taken away causes the roaster system energy loss big up to 10%, and the alumina producing energy consumption is higher.
Under the prerequisite that does not change the production technology situation, heat-exchange system is installed is reclaimed fume afterheat, heating is used for the wash water of horizontal table filter, replace original steam heated technology, can reduce the heat that flue gas is taken away, reduce roaster energy consumption, improve the quality of products, guarantee stable, the efficient operation of alumina producing, reach energy saving purposes.
A kind of dew-point corrosion resistant residual heat recovering system is arranged at present, house steward is connected with main pneumatic operated valve and secondary pneumatic operated valve by the force (forcing) pump shunting, main pneumatic operated valve connects the fire end inlet of temperature compensator by first valve, the fire end outlet of temperature compensator is by second valve, the 3rd valve connects radial heat exchanger heat exchange inlet, the heat exchange outlet of radial heat exchanger is by the 4th valve, the 5th valve connects temperature compensator colling end inlet, the colling end outlet of temperature compensator is connected with blender by the 7th valve, secondary pneumatic operated valve is connected with blender by the 8th valve, and mixer outlet connects the 6th valve.Radial heat exchanger is installed in after the expansion joint of flue outlet of Aluminium hydroxide roasting gaseous suspension stove, on the flue position before the blinds air door of ID blower fan, perforate leads to radial heat exchanger with flue gas on original flue, and the bypass pipe that chimney valve is arranged is installed on former flue, be used for radial heat exchanger maintenance or fortuitous event.Radial heat exchanger is installed on the idle vacant lot, neither can damage expansion joint and blinds air door, can guarantee the normal use of blinds air door again.Radial heat exchanger is in use assembled dust in radial heat exchanger, influence the heat exchange efficiency of radial heat exchanger.
The utility model content
Technical problem to be solved in the utility model provides a kind of under the prerequisite that does not change the production technology situation, gas suspending calcining furnace is installed heat-exchange system reclaim fume afterheat, the wash water that heating is used for horizontal table filter replaces original in Steam Heating filtration washing hot water and the high aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device of heat exchange efficiency to the required temperature of technology.
In order to solve the problems of the technologies described above, the aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device that the utility model provides comprises radial heat exchanger, temperature compensator and blender, and the air pulse soot blower system is installed on the described radial heat exchanger.
Described air pulse soot blower system is to be laid with a plurality of grey holes of blowing on described radial heat exchanger, the inlet end of compressed air collection case is connected with compressed air hose, the outlet side of described compressed air collection case is connected with a plurality of blowing pipes by magnetic valve, and described blowing pipe is connected described blowing in the grey hole.
Adopt the aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device of technique scheme, by radial heat exchanger, by-pass flue, temperature compensator, blender, temperature regulating and controlling system and air pulse soot blower system are formed, feedwater is divided into the master, secondary two flow processs, main flow feedwater (square position wash water) is through motor-driven valve, preheating in temperature compensator, entering radial heat exchanger is entered temperature compensator by flue gas heating back (flow direction of flue gas and cold fluid is the following current arranged crosswise) as thermal source and carries out heat exchange, the feedwater that enters blender and secondary flow range loop then is mixed into predetermined temperature, directly send the user tank.Temperature regulating and controlling system is made up of digital display temperature sensor TC, Programmable Logic Controller, control valve and data wire, guarantees that temperature can make to produce and stablize in meet the scope of technological requirement all the time in technological process.Programmable Logic Controller acts on control valve, regulates feedwater flow in real time, and the radial heat exchanger minimum wall temperature is on the flue gas dew point temperature, has avoided the generation of dew point corrosion effectively.The hot water temperature that temperature compensator is come out meets user's requirement.Influence the operation of whole heat-exchange system when preventing that temperature compensator from breaking down, also be provided with two bypass lines in the flow process, its effect is that the switch by valve cuts off the path that fluid enters temperature compensator.Touch-screen is used to import operating instruction.The air pulse soot blower system is made up of many rows blowing pipe and magnetic valve, is that working media produces the shock wave ash disposal with compressed air, utilizes shock wave, sound wave, high velocity air multiple action to blow ash.Combine the grey effect of blowing of acoustic wave ash ejector, gas shock-wave ash blowing device, blow grey better effects if, use safer.
Aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device of the present utility model has cooling fluid temperature self compensation, the adjusting automatically of radial heat exchanger wall temperature, feedwater flow and temperature control and the automatic dusting function of heat exchanger automatically, improved the ability of radial heat exchanger dew-point corrosion resistant, prolonged heat exchanger service life, can high efficiente callback shower furnace low-temperature flue gas waste heat.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is that air pulse soot blower system structure master of the present utility model looks schematic diagram;
Fig. 3 is that schematic diagram is looked on an air pulse soot blower system structure of the present utility model left side.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, Fig. 2 and Fig. 3, house steward 14 is connected with main pneumatic operated valve 18 and secondary pneumatic operated valve 22 by force (forcing) pump 15 and check-valves 16 shuntings, main pneumatic operated valve 18 connects the fire end inlet of temperature compensator 7 by first valve 11, the fire end outlet of temperature compensator 7 is by second valve 5, the 3rd valve 2 connects heat exchange of heat pipe 1 heat exchange inlet, the heat exchange outlet of heat exchange of heat pipe 1 is by the 4th valve 4, the 5th valve 6 connects temperature compensator 7 colling ends inlet, the colling end outlet of temperature compensator 7 is connected with blender 21 by the 7th valve 12, secondary pneumatic operated valve 22 is connected with blender 21 by the 8th valve 20, and blender 21 outlets connect the 6th valve 25 and flowmeter 26.Heat exchange of heat pipe 1 heat exchange outlet and blender 21 outlets respectively are provided with the digital display temperature sensor, and the digital display temperature sensor is electrically connected with Programmable Logic Controller 10, and Programmable Logic Controller 10 is electrically connected with main pneumatic operated valve 18 and secondary pneumatic operated valve 22.Main pneumatic operated valve 18 is provided with first by-passing valve 17, and secondary pneumatic operated valve 22 is provided with second by-passing valve 23.Temperature compensator 7 fire ends are provided with the 3rd by-passing valve 8, and temperature compensator 7 colling ends are provided with the 4th by-passing valve 9.Be laid with a plurality of grey holes 29 of blowing on radial heat exchanger 1, the inlet end of compressed air collection case 30 is connected with compressed air hose 31, and the outlet side of compressed air collection case 30 is connected with a plurality of blowing pipes 33 by magnetic valve 32, and blowing pipe 33 is connected and blows in the grey hole 29.
Referring to Fig. 1, radial heat exchanger 1 is installed in after the expansion joint of the flue outlet that electricity gathers dust, and on the flue position before the blinds air door of ID blower fan, perforate leads to radial heat exchanger 1 with flue gas on original flue.And the bypass pipe that chimney valve is arranged is installed on former flue, be used for radial heat exchanger 1 maintenance or fortuitous event.Radial heat exchanger 1 is installed on the idle vacant lot, neither can damage expansion joint and blinds air door, can guarantee the normal use of blinds air door again.By radial heat exchanger 1, temperature compensator 7, blender 21, main flow loop 13, in the system that secondary flow range loop 24 and programmable controller 10 are formed, cold fluid from house steward 14 through force (forcing) pump 15, check-valves 16, be divided into the master, secondary two flow processs, the main flow cold fluid is through main pneumatic operated valve 18, main flow loop 13, first valve 11, enter temperature compensator 7, be warmed up to predetermined value, through second valve, 5, the three valves 2, enter radial heat exchanger 1 and absorb fume afterheat again, the flow direction of flue gas and cold fluid is the following current arranged crosswise, fluid after being heated by the 4th valve 4 and the 5th valve 6, enters temperature compensator 7 as thermal source, carries out to a certain degree heat exchange with cold medium, enter blender 21 by the 7th valve 12, and the cold fluid of secondary flow journey is through secondary pneumatic operated valve 22, the 8th valve 20 enters blender 21, mix with the fluid that comes out from temperature compensator 7 reach predetermined temperature after, through the 6th valve 25, flowmeter 26 send user terminal.
Referring to Fig. 2 and Fig. 3, be laid with a plurality of grey holes 29 of blowing on the radial heat exchanger 1, the inlet end of compressed air collection case 30 is connected with compressed air hose 31, and the outlet side of compressed air collection case 30 is connected with a plurality of blowing pipes 33 by magnetic valve 32, and blowing pipe 33 is connected and blows in the grey hole 29.With compressed air is that working media produces the shock wave ash disposal, utilizes shock wave, sound wave, high velocity air multiple action to blow ash.Soot blower itself produces huge acoustic energy (reaching 160-170dB), is a kind of acoustic wave ash ejector.Simultaneously also produce strong shock wave, the gas shock-wave ash blowing device that can match in excellence or beauty combines the grey effect of blowing of acoustic wave ash ejector, gas shock-wave ash blowing device.
Blowing ash control sets: blow ash once per half an hour, and 4 rows are totally 48 magnetic valves 32,12 magnetic valve 32 sequentially-operatings of wherein every row, each magnetic valve 32 action 5 seconds, 10 seconds at interval.Set value adjustable.
Regulate PID by PLC, the switch element of control soot blower is realized magnetic valve 32 actions.
Humidity control system is formed (dotted line represents to connect lead among the figure) by digital display temperature sensor TC, Programmable Logic Controller 10, touch-screen 28, main pneumatic operated valve 18, secondary pneumatic operated valve 22 and connection lead.For the main flow loop, the fluid temperature (F.T.) of heat exchanger import department is by digital display temperature sensor TC, and Programmable Logic Controller 10 acts on main pneumatic operated valve 18, realizes the real-time adjusting of cold fluid flow, and the heat exchanger minimum wall temperature is on the flue gas dew point temperature.Through digital display temperature sensor TC, secondary pneumatic operated valve 22 valve openings of programmable controller 10 controls realize by blender 21 exit fluid temperature (F.T.)s in the adjusting of secondary flow journey cold fluid flow.And touch-screen 28 is used to import operating instruction.Main pneumatic operated valve 18, the 8th valve 20 next doors are respectively equipped with first by-passing valve 17 and second by-passing valve 23, under the normal condition, first by-passing valve 17 and second by-passing valve 23 are in closed condition, when pneumatic operated valve breaks down, can open by-passing valve simultaneously and realize manually control by closing former and later two valves of pneumatic operated valve.
Influence the operation of whole heat-exchange system when overhauling in order to prevent that temperature compensator 7 from breaking down, also be provided with two bypass lines in the flow process, its effect is the path that enters temperature compensator 7 by the switch cut-out medium of valve.Operating process is: the 3rd by-passing valve 8, the 4th by-passing valve 9 are opened, simultaneously the 5th valve 6, first valve 11 and second valve 5, the 7th valve 12 Close Alls of temperature compensator 7 can be realized.
In addition, also be provided with an emptying vent valve 3, the first blowoff valves 19 and second blowoff valve 27 in the flow process, be used for residual medium in system's stoppage in transit back discharge conduit.
The advantage of utility model and good effect:
The utility model aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat reclaims technology can realize feed temperature self compensation, the adjusting automatically of heat exchanger wall temperature, feedwater flow and temperature control and radial heat exchanger 1 automatic dusting function automatically, improved the ability of heat exchanger dew-point corrosion resistant, prolonged 1 service life of radial heat exchanger, can high efficiente callback shower furnace low-temperature flue gas waste heat.

Claims (2)

1. an aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device comprises radial heat exchanger (1), temperature compensator (7) and blender (21), and it is characterized in that: described radial heat exchanger is equipped with the air pulse soot blower system on (1).
2. aluminum oxide gaseous state suspending calcining furnace flue gas exhaust heat retracting device according to claim 1, it is characterized in that: described air pulse soot blower system is to be laid with a plurality of grey holes (29) of blowing on described radial heat exchanger (1), the inlet end of compressed air collection case (30) is connected with compressed air hose (31), the outlet side of described compressed air collection case (30) is connected with a plurality of blowing pipes (33) by magnetic valve (32), and described blowing pipe (33) is connected described blowing in the grey hole (29).
CN2011200050290U 2011-01-10 2011-01-10 Flue gas waste heat recovery device for alumina gaseous suspension roaster Expired - Fee Related CN201935588U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200050290U CN201935588U (en) 2011-01-10 2011-01-10 Flue gas waste heat recovery device for alumina gaseous suspension roaster

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Application Number Priority Date Filing Date Title
CN2011200050290U CN201935588U (en) 2011-01-10 2011-01-10 Flue gas waste heat recovery device for alumina gaseous suspension roaster

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CN201935588U true CN201935588U (en) 2011-08-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104697348A (en) * 2015-03-27 2015-06-10 沈阳鑫博工业技术股份有限公司 Device and method for recycling flue gas waste heat of roasting furnace
CN108622922A (en) * 2018-07-09 2018-10-09 中铝集团山西交口兴华科技股份有限公司 A kind of aluminium oxide returning charge calciner and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104697348A (en) * 2015-03-27 2015-06-10 沈阳鑫博工业技术股份有限公司 Device and method for recycling flue gas waste heat of roasting furnace
CN108622922A (en) * 2018-07-09 2018-10-09 中铝集团山西交口兴华科技股份有限公司 A kind of aluminium oxide returning charge calciner and method

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110817

Termination date: 20130110

CF01 Termination of patent right due to non-payment of annual fee