EP0302120A1 - Apparatus for recovering waste heat of sintering - Google Patents

Apparatus for recovering waste heat of sintering Download PDF

Info

Publication number
EP0302120A1
EP0302120A1 EP88901642A EP88901642A EP0302120A1 EP 0302120 A1 EP0302120 A1 EP 0302120A1 EP 88901642 A EP88901642 A EP 88901642A EP 88901642 A EP88901642 A EP 88901642A EP 0302120 A1 EP0302120 A1 EP 0302120A1
Authority
EP
European Patent Office
Prior art keywords
steam
exhaust gas
sintering
turbine
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88901642A
Other languages
German (de)
French (fr)
Other versions
EP0302120A4 (en
Inventor
Toshio Nühama Seizosho TSUKUDA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP32655/87 priority Critical
Priority to JP62032655A priority patent/JPH0646140B2/en
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Publication of EP0302120A1 publication Critical patent/EP0302120A1/en
Publication of EP0302120A4 publication Critical patent/EP0302120A4/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/185Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters using waste heat from outside the plant
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/26Cooling of roasted, sintered, or agglomerated ores
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06Endless-strand sintering machines

Abstract

An appts. comprises a heat exchanger for the exhaust gas of a sintering machine and water, a heat exchanger for the exhaust gas of a sintered mineral cooling machine and water and steam drum for mixing and keeping the steam generated from both heat exchangers. The steam supplied from the steam drum drives a turbine generator. Of the exhaust gas from the sintered mineral cooling machine, portion of the exhaust gas which has a max. gas temp. of from 450-500 deg.C is taken out separately for superheating the steam from the steam drum to obtain a superheated steam of 340-370 deg.C at 17-20 kg/sq.cm.G. This superheated steam is supplied to the steam turbine. Since the deg. of heating of the superheated steam supplied to the turbine exceeds 100 deg.C and steam consumption can be reduced, a turbine efficiency can be remarkably improved when compared with the prior art technique.

Description

    TECHNICAL FIELD
  • This invention relates to a device for recovering exhaust heat from a sintering process, the device recovering exhaust heat from an exhaust gas discharged from a sintering machine in a sintering plant and an exhaust gas discharged from a sintered ore cooling machine in the same, and generating superheated steam that can be utilized to drive a turbine generator.
  • BACKGROUND ART
  • Conventionally, a device for recovering exhaust heat from a sintering process is known which mixes and retains in a single steam drum the steam generated by performing heat-exchange between the exhaust gas in the discharge portion of a sintering machine and water and the steam generated by performing heat-exchange between the exhaust gas in the ore-supply portion of a sintered ore cooling machine and water, and which drives a steam turbine with the thus-mixed steam.
  • Referring to Fig. 1, a conventional example will now be described. Reference numeral 1 represents a sintering machine in which material charged therein is ignited in an ignition furnace 2 and is introduced to an ore-discharge portion 3. During this introduction of the material, exhaust gas is taken out by lower wind boxes 4, and the thus-taken exhaust gas is allowed to pass through a main intake pipe 5, whereupon it is absorbed by a main exhauster (not shown). The exhaust gas taken out by each the wind boxes 6, 7 and 8 adjacent to the terminal end of the wind box group is introduced into a heat exchanger 9 in which heat exchange is performed, and is introduced into the main intake pipe 5 where it is mixed with the other exhaust gas before being absorbed by the main exhauster. Steam generated by this heat exchanger 9 is introduced into a steam drum 10.
  • On the other hand, sintered ore is discharged at a high temperature from the sintering machine and is supplied to a cooling machine 11 where it is conveyed to the discharge portion of the cooling machine. During the discharge process, cooling air is blown upwardly from the lower portion by means of wind boxes 12 and 13. As a result, high temperature sintered ore is cooled down, the air being superheated, introduced into a hood 14 and conveyed to a heat exchanger 16 of the cooling machine via an introduction pipe 15. The exhaust gas in which heat exchange has been performed is circulated for use as cooling air. Steam generated from the heat exchanger 16 is introduced into a steam drum 10 through an introduction pipe 17. The steam in the steam drum 10 is mixed and averaged by receiving steam from the heat exchangers 9 and 16. The thus-averaged steam is supplied to a turbine generator 18, to obtain a stable power.
  • The example shown in Fig. 1 necessarily raises the following problem: since the temperature of the recovered gas is between 300 and 350°C, only the super- heated steam having a temperature of 250 to 280°C can be obtained under the recovered steam pressure of 8 to 14 kg/cm2G. Since the thus obtained steam has a relatively low pressure, the size of the governor at the inlet of the turbine needs to be made large if a large power turbine is intended. It is therefore difficult for a large power turbine to be designed. Furthermore, the adiabatic heat drop becomes relatively short and the turbine output becomes relatively small, so steam consumption per 1 kwh becomes considerable. For example, in the case of super-heated steam having a pressure of 14 kg/cm2 and a temperature of 280°C, the following is obtained: 6.5 kg/kwh and Ht (adiabatic heat drop) = 185 kcal/kg. Furthermore, the mechanical efficiency is poor because the reaction speed is too low and the size of the device too large. As for the degree of superheat, it is, in general, considered to be necessary for the superheat to have a temperature 100°C above the temperature of saturated steam. For example, since the temperature of saturated steam is substantially 197°C under a pressure of 14 kg/cm2G, the degree of superheat of 300°C or higher is needed. However, since the temperature of the exhaust gas is between 300 to 350°C, it is very difficult to obtain superheat exceeding 300°C by heat exchange between the gas and steam.
  • The recovering efficiency in the form of electricity is not sufficient with a device of the type shown in Fig. 1.
  • An object of the present invention is to provide a device for recovering exhaust gas from a sintering process which is improved as to generate high temperature and high pressure superheated steam.
  • DISCLOSURE OF INVENTION
  • According to the present invention, the following can be provided: a device for recovering exhaust heat from a sintering process constituted by a heat exchanger between exhaust gas from a sintering machine and water, another heat exchanger between exhaust gas from a sintered ore cooling device and water, steam drum for mixing and retaining steam generated from the two heat exchangers, and a turbine generator driven by steam from the steam drum, characterized in that: exhaust gas portions of the maximum temperature of 450 to 500°C of the gas in the sintering ore cooling device 110 is individually taken to superheat steam from the steam drum to generate superheated steam of 340 to 370°C under pressure of 17 to 20 kg/cm 2 G for the purpose of supplying the thus-generated superheated steam to the steam turbine.
  • BRIEF DESCRIPTION OF THE DRAWINGS
    • Fig. 1 is a schematic view illustrating an example of a conventional device for recovering exhaust heat from a sintering process;
    • Fig. 2 is a schematic view illustrating an embodiment of a device for recovering exhaust heat from a sintering process according to the present invention; and
    • Fig. 3 is a graph showing the temperatures of the exhaust gas from a cooling machine for sintered ores.
    BEST MODE FOR CARRYING OUT THE INVENTION
  • An embodiment of the present invention will now be described with reference to Fig. 2.
  • A sintering machine 101 ignites material 140 to be sintered in an ignition furnace 102 thereof, and air is taken in by blowers 117 and 122 through wind boxes 114. By introducing the intake air into the material 140 to be sintered, the sintering of the material is accelerated. The wind boxes 114 are divided into two groops of 14 wind boxes on the ore supply side and 3 wind boxes on the ore-discharge side, each of which is connected to the corresponding ducts 115 and 118. The duct 115 is connected to a chimney through an electric dust collector 116 and a blower 117. The duct 118 is connected to a hood 123 through a preduster 120, a boiler 121 and a blower 122. The hood 123 covers the sintered ore which corresponds to the Nos. 8 to 14 wind boxes of the 14 wind boxes on the ore-supply side.
  • At a rear portion of the ore-discharge side in the sintering machine 101 is provided a sinter breaker 103, while a hot screen 104 is disposed below the sinter breaker 103. Reference numeral 105 represents an ore- returning hopper disposed below the screen. Surrounding the upper surface of the hot screen 104 and the sinter breaker 103 is a hood that is provided in such a manner as to cover the ore to be sintered which corresponds to wind boxes Nos. 15 to 17 for the purpose of preventing heat radiation. A cooling device 110 for the sintered ore is connected next to the hot screen 104. Wind boxes 111 are divided into two groups: Nos. 1 to 7 and Nos. 8 to 13'. Air is introduced by a fan 113 to the Nos. 1 to 7 wind boxes, and is introduced to the Nos. 8 to 13 wind boxes by a fan 142. The upper surface of the ore to be sintered which corresponds to wind boxes Nos. 1 to 7 is divided into two parts, one of which corresponds to No. 1 wind box and the other of which corresponds to Nos. 2 to 7 wind boxes, each part being covered by a hood 107 and a hood 108, respectively. An exhaust gas outlet disposed in the hood 108 is connected to an air supplying .portion of the above-described fan 113 via the boiler 112. An outlet from the hood 107 is connected to an individual super heater 135 through which the exhaust gas is discharged as it is.
  • Next, an exhaust heat recovery system will be described. Water from a water-supply tank 124 is deaerated by a deaerator 125, and a part of it is introduced into a portion adjacent to an exhaust outlet in the boiler 121 wherein heat exchange with the exhaust gas is performed before it is accumulated in a boiler drum 132. Hot water in the boiler drum 132 is circulated through the central portion of the boiler 121 by means of a pump 133, and a part of it becomes steam, whereupon it is returned to the boiler drum 132. Steam in the boiler drum 132 is heat-exchanged with a high temperature gas at an exhaust gas inlet portion in the boiler 121, and accumulates in the form of superheated steam in the steam header 134. On the other hand, a part of the water in the deaerator 125 is introduced into a portion adjacent to an exhaust gas outlet in the boiler 112 where it is heat-exchanged to partially become steam. As a result, the steam is returned to the deaerator 125. Another part is introduced to a predetermined location within the boiler 112 by a pump 128 whereby it is heat-exchanged and accumulated in a boiler drum 129. Hot water is circulated to a portion in which a high temperature gas is present at an exhaust gas inlet in the boiler 112 for the purpose of heat-recovery. Steam in the boiler drum 129 is superheated at the front side of the exhaust gas inlet in the boiler 112, and is introduced into a steam header 134. Steam in the steam header 134 is further superheated by a superheater 135, and is supplied to a turbine 136 in the form of superheated steam having a pressure of 18 kg/om2 and a temperature of 350°C for the purpose of driving the turbine 136. As a result, a generator 137 which is coaxially disposed relative to the turbine 136 is rotated. Steam discharged from the turbine 136 is condensed as it passes through a condenser 138 to become water again. This water is circulated to an water supply tank 124 by a pump 139. As shown in Fig. 3, the temperature of the gas at the portion corresponding to the superheater 135 is higher than 450°C, and the degree of superheat exceeds 100°C. Therefore, sufficient superheated steam exceeding 350°C can be obtained. Furthermore, steam consumption becomes substantially 5.0 kg per kwh. In comparison with the conventional device, turbine efficiency can thus be significantly improved.

Claims (1)

  1. A device for recovering exhaust heat from a sintering process constituted by a heat exchanger between exhaust gas from a sintering machine and water, another heat exchanger between exhaust gas from a sintered ore cooling device and water, steam drum for mixing and retaining steam generated from said two heat exchangers, and a turbine generator driven by steam from said steam drum, said device for recovering exhaust gas from a sintering process being characterized in that: exhaust gas portions of the maximum temperature of 450 to 500°C of the gas in the sintering ore cooling device is individually taken to superheat steam from said steam drum to generate superheated steam of 340 to 370°C under pressure of 17 to 20 kg/cm 2 G for the purpose of supplying the thus-generated superheated steam to said steam turbine.
EP19880901642 1987-02-16 1988-02-15 Apparatus for recovering waste heat of sintering Withdrawn EP0302120A4 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP32655/87 1987-02-16
JP62032655A JPH0646140B2 (en) 1987-02-16 1987-02-16 Sintered exhaust heat recovery device

Publications (2)

Publication Number Publication Date
EP0302120A1 true EP0302120A1 (en) 1989-02-08
EP0302120A4 EP0302120A4 (en) 1991-07-10

Family

ID=12364878

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880901642 Withdrawn EP0302120A4 (en) 1987-02-16 1988-02-15 Apparatus for recovering waste heat of sintering

Country Status (3)

Country Link
EP (1) EP0302120A4 (en)
JP (1) JPH0646140B2 (en)
WO (1) WO1988006227A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101344359B (en) * 2008-08-20 2011-04-20 首钢总公司 Sintered ring cold exhaust heat stepped recovery power generation system and technique
JP2013024522A (en) * 2011-07-25 2013-02-04 Nippon Steel & Sumitomo Metal Corp Method for control of exhaust heat recovery equipment in sintered ore cooling machine
CN103438723A (en) * 2013-09-10 2013-12-11 中钢集团鞍山热能研究院有限公司 Integrated utilization technology and device of sintering waste heat
CN103527276A (en) * 2012-07-02 2014-01-22 川崎重工业株式会社 Exhaust heat recovery power generation plant for sintering facility

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0734316Y2 (en) * 1989-11-20 1995-08-02 住友重機械工業株式会社 Exhaust heat recovery device in sintering equipment
JP5813344B2 (en) * 2011-03-17 2015-11-17 川崎重工業株式会社 Waste heat recovery power plant for sintering equipment
CN102353276B (en) * 2011-10-10 2013-07-10 西安陕鼓工程技术有限公司 Waste heat comprehensive utilization power generation system and power generation method for sintering production line

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56142830A (en) * 1980-04-07 1981-11-07 Kawasaki Steel Corp Sintering method for ore material or the like
JPS58104311A (en) * 1981-12-16 1983-06-21 Sumitomo Metal Ind Ltd Waste heat recovering method
EP0141890A1 (en) * 1983-11-16 1985-05-22 Sumitomo Heavy Industries, Ltd Waste gas circulation method and system for sintering apparatus
US4536211A (en) * 1982-05-18 1985-08-20 Sumitomo Metal Industries, Ltd. Waste gas circulation method and system for sintering apparatus
JPS61213329A (en) * 1985-03-16 1986-09-22 Nippon Steel Corp Method for recovering waste heat in sintering installation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS619523B2 (en) * 1980-06-30 1986-03-24 Sumitomo Jukikai Kogyo Kk
JPS6349729B2 (en) * 1981-08-10 1988-10-05 Sumitomo Heavy Industries
JPS6339645B2 (en) * 1984-06-22 1988-08-05 Nippon Steel Corp
JPH0637365B2 (en) * 1987-09-03 1994-05-18 株式会社中埜酢店 Control method for seed infectious disease fungus of plant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56142830A (en) * 1980-04-07 1981-11-07 Kawasaki Steel Corp Sintering method for ore material or the like
JPS58104311A (en) * 1981-12-16 1983-06-21 Sumitomo Metal Ind Ltd Waste heat recovering method
US4536211A (en) * 1982-05-18 1985-08-20 Sumitomo Metal Industries, Ltd. Waste gas circulation method and system for sintering apparatus
EP0141890A1 (en) * 1983-11-16 1985-05-22 Sumitomo Heavy Industries, Ltd Waste gas circulation method and system for sintering apparatus
JPS61213329A (en) * 1985-03-16 1986-09-22 Nippon Steel Corp Method for recovering waste heat in sintering installation

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 53 (C-404), 19th February 1987; & JP-A-61 213 329 (NIPPON STEEL) 22-09-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 19 (C-090), 3rd February 1982; & JP-A-56 142 830 (KAWASAKI) 07-11-1981 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 207 (M-242), 13th Spetember 1983; & JP-A-58 104 311 (SUMITOMO) 21-06-1983 *
See also references of WO8806227A1 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101344359B (en) * 2008-08-20 2011-04-20 首钢总公司 Sintered ring cold exhaust heat stepped recovery power generation system and technique
JP2013024522A (en) * 2011-07-25 2013-02-04 Nippon Steel & Sumitomo Metal Corp Method for control of exhaust heat recovery equipment in sintered ore cooling machine
CN103527276A (en) * 2012-07-02 2014-01-22 川崎重工业株式会社 Exhaust heat recovery power generation plant for sintering facility
CN103527276B (en) * 2012-07-02 2016-11-09 川崎重工业株式会社 Agglomerating plant Waste Heat Recovery generating equipment
CN103438723A (en) * 2013-09-10 2013-12-11 中钢集团鞍山热能研究院有限公司 Integrated utilization technology and device of sintering waste heat
CN103438723B (en) * 2013-09-10 2015-08-12 中钢集团鞍山热能研究院有限公司 A kind of sintering waste heat comprehensive utilization process and device

Also Published As

Publication number Publication date
EP0302120A4 (en) 1991-07-10
JPS63201488A (en) 1988-08-19
WO1988006227A1 (en) 1988-08-25
JPH0646140B2 (en) 1994-06-15

Similar Documents

Publication Publication Date Title
CN101118125A (en) Smelting sintered ring-cold heat-recovering generating plant and method thereof
CN100458121C (en) Atmospheric pressure combustion turbine system
EP0571233B1 (en) Staged furnaces for firing coal pyrolysis gas and char
US4536211A (en) Waste gas circulation method and system for sintering apparatus
CN203050805U (en) Power generating equipment
CZ33893A3 (en) Arrangement for utilization of heat contained in coal burning boiler combustion products
CN102057239A (en) Method for manufacturing a cement clinker, and cement clinker manufacturing facility
GB2338991A (en) Compound power-generating plant with superheated high pressure steam
RU2137046C1 (en) Method and device for raising power plant efficiency
EP0302120A1 (en) Apparatus for recovering waste heat of sintering
CN102865746A (en) Improved waste heat power generation system for cement industry
CN102589305B (en) Sintering waste heat generating system
CN101196370B (en) Novel combined cement clinker roasted and waste heat generation system and technique
GB2108251A (en) A heat treatment plant especially for producing cement clinker
US4163910A (en) Vapor generator and MHD power plant
US4365953A (en) Cooler for combustible material
FI70071C (en) Combination gas-aongprocesskraftverk
CA2109938A1 (en) Environmentally acceptable electric energy generation process and plant
KR101696297B1 (en) Combined Heat and Power System for Energy-saving type
JPH0734316Y2 (en) Exhaust heat recovery device in sintering equipment
CN202470787U (en) Sintering afterheat power generation system
US3150267A (en) Steam power plants
CN204085216U (en) A kind of mineral heating furnace flue and molten iron sensible heat combined recovery electricity generation system
KR950001908B1 (en) Recovery device of sintering exhaust heat
US5051040A (en) Fluidized bed combustion system that is controllable under pressure

Legal Events

Date Code Title Description
17P Request for examination filed

Effective date: 19881109

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

A4 Supplementary search report drawn up and despatched

Effective date: 19910522

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): DE FR GB IT

18D Application deemed to be withdrawn

Effective date: 19910813