CN102586549A - System for utilizing waste heat of flue gas of annealing furnace - Google Patents

System for utilizing waste heat of flue gas of annealing furnace Download PDF

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Publication number
CN102586549A
CN102586549A CN2012100493809A CN201210049380A CN102586549A CN 102586549 A CN102586549 A CN 102586549A CN 2012100493809 A CN2012100493809 A CN 2012100493809A CN 201210049380 A CN201210049380 A CN 201210049380A CN 102586549 A CN102586549 A CN 102586549A
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water
gas
heat exchanger
equipment
heat
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CN2012100493809A
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CN102586549B (en
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蔡屹
彭起
周薇
王森
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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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

Abstract

The invention discloses a system for utilizing waste heat of flue gas of an annealing furnace. The system comprises waste heat recovery equipment. The waste heat recovery equipment comprises a gas-water heat exchanger. The gas-water heat exchanger is arranged on a flue gas discharge passage. A water inlet and a water outlet of the gas-water heat exchanger are respectively connected with waste heat utilization equipment to form a loop. Water circulation equipment is arranged in the loop. When the flue gas which is generated by roll steel in the annealing furnace is processed by the system disclosed by the invention, most of heat in the flue gas is recycled, the emission of pollutants is reduced, the pollution to the environment is reduced and the cost of flue gas emission is reduced. Moreover, according to the invention, the recovered heat is applied to heat water and high temperature water is provided to a user end, so that the using amount of steam of the user end is saved, the energy is sufficiently utilized and the energy saving and emission reduction are implemented.

Description

The lehre fume afterheat utilizes system
Technical field
The present invention relates to a kind of bootstrap system, especially a kind of lehre fume afterheat utilizes system.
Background technology
In the production process of steel rolling; Lehre can produce the flue gas that contains high calorie, but domestic at present not well equipment can recycle the heat in the flue gas, and because flue-gas temperature is too high; Must could discharge afterwards with outdoor new wind hybrid cooling; Increase the cost of fume emission on the contrary, caused energy dissipation, also polluted environment.
Summary of the invention
The technical problem that the present invention will solve provides a kind of lehre fume afterheat and utilizes system, and this system can recycle the heat that contains in the lehre flue gas effectively.
In order to solve the problems of the technologies described above; The invention provides a kind of lehre fume afterheat and utilize system, it is characterized in that said system comprises waste heat recovery apparatus; Said waste heat recovery apparatus includes gas-water-to-water heat exchanger; Said gas-water-to-water heat exchanger is installed on the flue gas exhaust channel, and the water-in of said gas-water-to-water heat exchanger is connected with UTILIZATION OF VESIDUAL HEAT IN equipment respectively with water outlet and forms the loop, in said loop, is provided with water circulating apparatus.
Further, said water circulating apparatus includes water pump, and said water pump is serially connected with on the return between gas-water-to-water heat exchanger and the UTILIZATION OF VESIDUAL HEAT IN equipment, and said water pump is a variable frequency pump.
Further; Said water circulating apparatus also includes variable frequency pump unit, TM and under meter; Said TM and under meter are arranged on the water outlet place of gas-water-to-water heat exchanger, and are connected with said variable frequency pump unit, and said variable frequency pump unit also is connected with said variable frequency pump.
Further; Said UTILIZATION OF VESIDUAL HEAT IN equipment includes gas-water/gas-vapour associating interchanger, steam flow unit and temperature-detecting device; The water-in of said associating interchanger and water outlet are connected to form the loop with gas-water-to-water heat exchanger respectively; Said steam flow unit is connected with the steam valve of associating interchanger, and said steam flow unit also is connected with said temperature-detecting device.
Further, said system also includes boosting equipment, and the steam outlet of said boosting equipment is connected with the turnover steam ports of associating interchanger respectively with steam inlet.
Further, be provided with the automatic voltage regulation opertaing device in the said loop between water circulating apparatus and UTILIZATION OF VESIDUAL HEAT IN equipment.
Further; Said automatic voltage regulation opertaing device includes water replanishing device, pressure relief device, water storage device and pressure-detecting device; Said pressure-detecting device is connected with return; Said return also is connected with water storage device, and said water storage device also is connected with pressure relief device with water replanishing device, and said pressure-detecting device also is connected with pressure relief device with water replanishing device.
The flue gas that steel rolling produces in lehre is through processing of the present invention, and the most of heat in the flue gas is recovered utilization, has reduced the discharging of pollutent; Alleviated pollution to environment; Reduced the cost of fume emission, and this invention is applied to the heat that reclaims to heat water temperature and high-temperature water is provided to user side, practiced thrift the steam consumption of user side; Make full use of the energy, realized energy-saving and emission-reduction.
Description of drawings
Fig. 1 is the structure iron that lehre fume afterheat of the present invention utilizes system.
Among the figure, 1. waste heat recovery apparatus, 2. gas-water-to-water heat exchanger, 3. UTILIZATION OF VESIDUAL HEAT IN equipment, 4. variable frequency pump, 5. water circulating apparatus, 6. automatic voltage regulation opertaing device, 7. boosting equipment, 8. TM, 9. under meter.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further so that those skilled in the art can better understand the present invention and implementing, but the embodiment that lifts not conduct to qualification of the present invention.
As shown in Figure 1; The lehre fume afterheat utilizes system to comprise waste heat recovery apparatus 1; Said waste heat recovery apparatus 1 includes gas-water-to-water heat exchanger 2; Said gas-water-to-water heat exchanger 2 is installed on the lehre flue gas exhaust channel, and the water-in of said gas-water-to-water heat exchanger 2 is connected with UTILIZATION OF VESIDUAL HEAT IN equipment 3 respectively with water outlet and forms the loop.
In said loop, be provided with water circulating apparatus 5; Said water circulating apparatus 5 includes water pump; Said water pump is ganged up on the return between gas-water-to-water heat exchanger and the UTILIZATION OF VESIDUAL HEAT IN equipment 3, and said water pump is preferably variable frequency pump 4, and the water in the whole loop is accomplished by variable frequency pump 4 and driven; Said UTILIZATION OF VESIDUAL HEAT IN equipment 3 includes gas-water/gas-vapour associating interchanger, and the water-in of said associating interchanger and water outlet are connected to form the loop with gas-water-to-water heat exchanger respectively.
The lehre flue gas that contains high calorie gets into gas-water-to-water heat exchanger 2 through exhaust channel; And the water in gas-water-to-water heat exchanger 2 is heated to 130 ℃-150 ℃, along loop flow, the water in the loop is through the water-in entering associating interchanger of associating interchanger under the driving of variable frequency pump 4 for water; Utilize the gas-hydrothermal exchange function of associating interchanger; With the heat transferred user side in the water, the water outlet that passes through the associating interchanger through the water of lowering the temperature gets into circuit cycle, proceeds to heating in the waste heat recovery apparatus 1; With this reciprocation cycle, made full use of the waste heat in the lehre flue gas.
Said water circulating apparatus 5 also includes variable frequency pump unit, TM 8 and under meter 9; Said TM 8 and under meter 9 are installed in the water outlet place of gas-water-to-water heat exchanger 2; And be connected with said variable frequency pump unit, said variable frequency pump unit also is connected with said variable frequency pump 4.
Said TM 8 is measured temperature information and the flow information that gas-water-to-water heat exchanger 2 flows out water respectively with under meter 9; When the temperature that the gas-water-to-water heat exchanger 2 that records when TM 8 flows out water is lower than UTILIZATION OF VESIDUAL HEAT IN equipment 3 heat demand; And temperature information is transferred to the variable frequency pump unit; Said variable frequency pump unit then reduces the operating frequency of variable frequency pump 4, and the circulation of the water that slows down prolongs the heat-up time of water in gas-water-to-water heat exchanger 2; And then improve the temperature that flows out water, reach the heat demand of UTILIZATION OF VESIDUAL HEAT IN equipment 3; When the temperature that the gas-water-to-water heat exchanger 2 that records when TM 8 flows out water is higher than UTILIZATION OF VESIDUAL HEAT IN equipment 3 heat demand; And temperature information is transferred to the variable frequency pump unit; Said variable frequency pump unit then improves the operating frequency of variable frequency pump 4, accelerates the circulation of water, shortens the heat-up time of water in gas-water-to-water heat exchanger 2; And then reduce the temperature that flows out water, reach the heat demand of UTILIZATION OF VESIDUAL HEAT IN equipment 3.
Water in the loop can produce vaporization phenomenon under 130 ℃ of-150 ℃ of environment; Do not vaporize for guaranteeing the water in the loop; Return between variable frequency pump 4 and the UTILIZATION OF VESIDUAL HEAT IN equipment 3 is provided with automatic voltage regulation opertaing device 6; Include water replanishing device, pressure relief device, water storage device and pressure-detecting device in the said automatic voltage regulation opertaing device 6, said pressure-detecting device is connected with return, and said return also is communicated with water storage device; Said water storage device also is connected with pressure relief device with water replanishing device, and said pressure-detecting device also is connected with pressure relief device with water replanishing device.
Pressure-detecting device in automatic voltage regulation opertaing device 6; Record when the pressure of water is higher than the level pressure value in the return; Give pressure relief device with information transmission this moment, and said pressure relief device is expelled to water storage device with the water in the return, thereby reduce the pressure of water in the loop; Pressure-detecting device in automatic voltage regulation opertaing device 6; Record when the pressure of water is lower than the level pressure value in the return; Give water replanishing device with information transmission this moment; Said water replanishing device is with in the water infusion circuit pipeline in the water storage device, thereby the pressure of water in the raising loop is not vaporized to guarantee the water in the loop.
In actual moving process, when the heat that provides when the lehre flue gas can't satisfy the heat supplied demand of UTILIZATION OF VESIDUAL HEAT IN equipment 1, the heat supplied demand that at this moment just needs boosting equipment 7 to guarantee UTILIZATION OF VESIDUAL HEAT IN equipment 1 through steam heat is provided.Said UTILIZATION OF VESIDUAL HEAT IN equipment 1 includes gas-water/gas-vapour associating interchanger, steam flow unit and temperature-detecting device; Said steam flow unit is connected with the steam valve of associating interchanger; Said steam flow unit also is connected with said temperature-detecting device, and the steam outlet of said boosting equipment 7 is connected with the turnover steam ports of steam inlet with the associating interchanger.When the heat supply temperature of the UTILIZATION OF VESIDUAL HEAT IN equipment 1 that records when said temperature-detecting device is lower than set(ting)value; And give the steam flow unit with the information transmission that records; The aperture of the steam valve of said steam flow unit control associating interchanger; And then the steam supply amount of regulating boosting equipment 7, steam utilizes gas-vapour hot-swap feature to satisfy the heat demand of UTILIZATION OF VESIDUAL HEAT IN equipment 1 in the associating interchanger.
The above embodiment is the preferred embodiment that proves absolutely that the present invention lifts, and protection scope of the present invention is not limited thereto.Being equal to that the technician in present technique field is done on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.

Claims (7)

1. a lehre fume afterheat utilizes system; It is characterized in that; Said system comprises waste heat recovery apparatus, and said waste heat recovery apparatus includes gas-water-to-water heat exchanger, and said gas-water-to-water heat exchanger is installed on the flue gas exhaust channel; The water-in of said gas-water-to-water heat exchanger is connected with UTILIZATION OF VESIDUAL HEAT IN equipment respectively with water outlet and forms the loop, in said loop, is provided with water circulating apparatus.
2. bootstrap system according to claim 1 is characterized in that said water circulating apparatus includes water pump, and said water pump is serially connected with on the return between gas-water-to-water heat exchanger and the UTILIZATION OF VESIDUAL HEAT IN equipment, and said water pump is a variable frequency pump.
3. bootstrap system according to claim 2; It is characterized in that; Said water circulating apparatus also includes variable frequency pump unit, TM and under meter; Said TM and under meter are arranged on the water outlet place of gas-water-to-water heat exchanger, and are connected with said variable frequency pump unit, and said variable frequency pump unit also is connected with said variable frequency pump.
4. bootstrap system according to claim 1; It is characterized in that; Said UTILIZATION OF VESIDUAL HEAT IN equipment includes gas-water/gas-vapour associating interchanger, steam flow unit and temperature-detecting device; The water-in of said associating interchanger and water outlet are connected to form the loop with gas-water-to-water heat exchanger respectively, and said steam flow unit is connected with the steam valve of associating interchanger, and said steam flow unit also is connected with said temperature-detecting device.
5. bootstrap system according to claim 4 is characterized in that said system also includes boosting equipment, and the steam outlet of said boosting equipment is connected with the turnover steam ports of associating interchanger respectively with steam inlet.
6. bootstrap system according to claim 1 is characterized in that, is provided with the automatic voltage regulation opertaing device in the said loop between water circulating apparatus and UTILIZATION OF VESIDUAL HEAT IN equipment.
7. bootstrap system according to claim 6; It is characterized in that; Said automatic voltage regulation opertaing device includes water replanishing device, pressure relief device, water storage device and pressure-detecting device, and said pressure-detecting device is connected with return, and said return also is connected with water storage device; Said water storage device also is connected with pressure relief device with water replanishing device, and said pressure-detecting device also is connected with pressure relief device with water replanishing device.
CN201210049380.9A 2012-02-29 2012-02-29 System for utilizing waste heat of flue gas of annealing furnace Active CN102586549B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113932620A (en) * 2021-10-26 2022-01-14 山东钢铁集团日照有限公司 Device and method for utilizing flue gas waste heat of sintering circular cooler

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101368747A (en) * 2008-10-07 2009-02-18 山东泰山钢铁集团有限公司 Enclosed heating system using exhaust heat of slag flushing water
CN101871042A (en) * 2010-06-25 2010-10-27 中冶南方(武汉)威仕工业炉有限公司 Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit
CN102003697A (en) * 2010-12-31 2011-04-06 湖南正大轻科机械有限公司 Device for generating steam by utilizing high-temperature waste gas
CN202530124U (en) * 2012-02-29 2012-11-14 中冶南方工程技术有限公司 Flue gas waste heat utilization system for annealing furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101368747A (en) * 2008-10-07 2009-02-18 山东泰山钢铁集团有限公司 Enclosed heating system using exhaust heat of slag flushing water
CN101871042A (en) * 2010-06-25 2010-10-27 中冶南方(武汉)威仕工业炉有限公司 Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit
CN102003697A (en) * 2010-12-31 2011-04-06 湖南正大轻科机械有限公司 Device for generating steam by utilizing high-temperature waste gas
CN202530124U (en) * 2012-02-29 2012-11-14 中冶南方工程技术有限公司 Flue gas waste heat utilization system for annealing furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113932620A (en) * 2021-10-26 2022-01-14 山东钢铁集团日照有限公司 Device and method for utilizing flue gas waste heat of sintering circular cooler

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