CN102589308A - Waste heat recycling system of industrial furnaces - Google Patents
Waste heat recycling system of industrial furnaces Download PDFInfo
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- CN102589308A CN102589308A CN2012100683127A CN201210068312A CN102589308A CN 102589308 A CN102589308 A CN 102589308A CN 2012100683127 A CN2012100683127 A CN 2012100683127A CN 201210068312 A CN201210068312 A CN 201210068312A CN 102589308 A CN102589308 A CN 102589308A
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- Y—GENERAL 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
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Abstract
The invention discloses a waste heat recycling system of industrial furnaces, which comprises a main smoke discharge channel and a waste heat recycling device. The waste heat recycling device is connected onto the main smoke discharge channel and consists of a primary heat exchange device and a secondary heat exchange device, the primary heat exchange device is a gas/water heat exchanger with a water inlet and a water outlet, the gas/water heat exchanger is serially connected onto the main smoke discharge channel, the secondary heat exchange device is a water/water heat exchanger provided with a primary water inlet, a primary water outlet, a secondary water inlet and a secondary water outlet, the water outlet of the gas/water heat exchanger is communicated with the primary water inlet of the water/water heat exchanger, the primary water outlet of the water/water heat exchanger is communicated with the water inlet of the gas/water heat exchanger, a to-be-heated cold water pipeline is communicated with the secondary water inlet of the water/water heat exchanger, and the secondary water outlet of the water/water heat exchanger is communicated with a domestic hot water pump disposed on a hot water pipeline and a heat storage water pond via the hot water pipeline. The waste heat recycling system is simple in structure and high in waste heat utilization rate, the temperature of discharge flue gas of the industrial furnaces can be effectively reduced to about 130 DEG C, and simultaneously, hot water with the temperature of 60 DEG C can be obtained to meet requirements of people on water supply and heating.
Description
Technical field
The present invention relates to the waste heat recovery of industrial combustion gas (fuel oil) stove high-temperature flue gas, especially relate to a kind of industrial furnace residual neat recovering system.
Background technology
At present the energy of China 90% is from chemical fuel, and this form in a short time (15-20) can not change.Because China is a resource-starved country; Need a large amount of import energy with the support high-speed needs of economic development; And the energy is controlled through the forward market by developed country to a great extent; In order to reduce in energy problem the undue dependence of other country, energy-conservationly receive the attention of government as a practicable strategy, and proposed a kind of new theory: " energy-conservation " also is a kind of important energy source.
The outstanding aspect of practicing thrift heat energy reclaims and utilizes waste heat exactly.The flue gas that industrial combustion gas (fuel oil) stove produces in process of production is through the exhaust gas temperature still higher (can reach 350-700 ℃) after UTILIZATION OF VESIDUAL HEAT IN of industrial furnace; The flue gas that temperature is reached 350-700 ℃ directly is emitted in the atmosphere; Both wasted the energy, again contaminated environment.If can exhaust gas temperature be reduced to below 180 ℃ (even lower), then both can reach energy-saving and emission-reduction, reduce the production run cost, can play the purpose of the quality of improving the people's livelihood again.
The coke oven of at present domestic large-scale steel plant can be accomplished to utilize waste heat to generate electricity.But China's metallic heat treating furnace of also having large quantities of scales to differ simultaneously, power megawatt from hundreds of to a few does not wait.Because the thermal efficiency of heat-treatment furnace is merely about 50%, how very great practical significance to be arranged to this part UTILIZATION OF VESIDUAL HEAT IN well.
Summary of the invention
The object of the present invention is to provide a kind of industrial furnace residual neat recovering system, it can fully reclaim the high-temperature flue gas that discharges in the industrial furnace production, reaches good energy-conservation purpose.
For realizing above-mentioned purpose, the present invention can take following technical proposals:
Industrial furnace residual neat recovering system of the present invention; Comprise total discharge flue of being connected with a plurality of industrial furnace smokejacks and be connected the waste-heat recovery device on said total discharge flue that said waste-heat recovery device is made up of heat-exchanger rig and two times heat changing device through smoke exhaust fan; A said heat-exchanger rig is for to be connected on the gas/water-to-water heat exchanger that has intake-outlet on total discharge flue through control valve, and said two times heat changing device is the water/water-to-water heat exchanger that has one-level intake-outlet and secondary intake-outlet; The delivery port of said gas/water-to-water heat exchanger is connected with the one-level water inlet of water/water-to-water heat exchanger through pipeline, and the one-level delivery port of said water/water-to-water heat exchanger is connected with the water inlet of said gas/water-to-water heat exchanger through pipeline and the hot water circulating pump and the safety valve that are arranged on the said pipeline; Cold water pipeline to be heated is connected with the secondary water inlet of said water/water-to-water heat exchanger through valve, and the secondary effluent mouth of said water/water-to-water heat exchanger is connected with the thermal storage tank through domestic hot-water's pipeline and the domestic hot-water's pump that is arranged on this domestic hot-water's pipeline.
Said gas/water-to-water heat exchanger is a heat exchange of heat pipe, and said water/water-to-water heat exchanger is a plate type heat exchanger.
Total discharge flue behind the said smoke exhaust fan is gentle/be provided with the bypass discharge flue between the discharge flue at water-to-water heat exchanger exhaust opening rear portion, and said bypass discharge flue is provided with by-pass valve control.
Said cold water pipeline to be heated comprises circulation line of drawing from the thermal storage tank that is connected in parallel and the water pipe of being introduced by the running water pipe network; On said circulation line and water pipe, be respectively arranged with opening/shutting valve, be in series with control valve at said water pipe.
The invention has the advantages that simple in structure, utilization rate of waste heat is high, when effectively reducing to the industrial furnace smog discharge temperature about 130 ℃, can also obtain water supply and heating demand that 60 ℃ hot water satisfies people.
Description of drawings
Fig. 1 is a systematic schematic diagram of the present invention.
The specific embodiment
As shown in Figure 1; Industrial furnace residual neat recovering system of the present invention; Comprise total discharge flue 2 of being connected with a plurality of industrial furnace 1 smokejacks and be connected the waste-heat recovery device on total discharge flue 2 that said waste-heat recovery device is made up of heat-exchanger rig and two times heat changing device through smoke exhaust fan 3; A heat-exchanger rig is for to be connected on the gas/water-to-water heat exchanger that has intake-outlet 5 on total discharge flue 2 through control valve 4, and two times heat changing device is the water/water-to-water heat exchanger 6 that has one-level intake-outlet and secondary intake-outlet; The delivery port of gas/water-to-water heat exchanger 5 is connected with the one-level water inlet of water/water-to-water heat exchanger 6 through pipeline, and the one-level delivery port of water/water-to-water heat exchanger 6 is connected with the water inlet of gas/water-to-water heat exchanger 5 with safety valve 8 through pipeline and the hot water circulating pump 7 that is arranged on the pipeline; Cold water pipeline to be heated is connected with the secondary water inlet of water/water-to-water heat exchanger 6 through valve, and the secondary effluent mouth of water/water-to-water heat exchanger 6 is connected with thermal storage tank 11 through domestic hot-water's pipeline 9 and the domestic hot-water's pump 10 that is arranged on this domestic hot-water's pipeline 9.
For guaranteeing the waste heat recovery effect, gas/water-to-water heat exchanger 5 selects to use heat-pipe heat exchanger, and water/water-to-water heat exchanger 6 adopts plate type heat exchanger.
For guaranteeing stove crowd's ordinary production, between the discharge flue at the 2 gentle/water-to-water heat exchanger 5 exhaust opening rear portions of the total discharge flue behind the smoke exhaust fan 3, be provided with bypass discharge flue 12, bypass discharge flue 12 is provided with by-pass valve control 13.In the time need not utilizing fume afterheat or flue gas waste heat recovery system to break down, system has closed closing valve automatically, opens bypass discharge flue 12 automatically, and the assurance flue gas is discharged smoothly.
Cold water pipeline to be heated comprises circulation line 14 of drawing from thermal storage tank 11 that is connected in parallel and the water pipe of being introduced by the running water pipe network 15; On circulation line 14 and water pipe 15, be respectively arranged with opening/shutting valve 16, be in series with control valve 17 at water pipe 15.The clear hot-water that thermal storage tank's 11 storage of water/water-to-water heat exchanger 6 Gong to come over; In thermal storage tank 11, be provided with fluid level transmitter and limit switch; When the water level in the thermal storage tank 11 does not reach upper limit; Running water gets into water/water-to-water heat exchanger 6 through water pipe 15 and heats, and control valve 17 and the closed-loop control of outlet water temperature stroke are the hot water about 60 ℃ with the water that guarantees injection thermal storage tank 11; Water in thermal storage tank 11 reaches upper limit; When has just expired in the pond; Close water pipe 15: if water temperature is lower than 65 ℃ in this moment pond, then start circulation line 14, promptly the water pool inner water is evacuated to water/water-to-water heat exchanger 6 by domestic hot-water's pump 10 and heats; No longer carry out valve regulated, open loop control.When full and temperature is higher than 65 ℃ when tank water, close residual neat recovering system, utilize bypass discharge flue 12 to discharge flue gases.
When the present invention works; The high-temperature flue gas that many industrial furnaces 1 are produced confluxes into, and a total discharge flue 2 carries out forced fume exhaust; Through its smoke evacuation pressure of smoke exhaust fan 3 controls, be connected in series to heat-pipe heat exchanger 5 on total discharge flue 2, a pair of intake-outlet of heat exchanger 5 connects demineralized water; Make it carry out heat exchange with hot water circulating pump 7, obtain the highest 120 ℃ hot mastication water through heat exchanger 5 circulations; Carry out secondary heat exchange to hot mastication water through plate type heat exchanger 6, plate type heat exchanger 6 other a pair of intake-outlets meet running water or thermal storage tank 11 respectively, and the hot water that obtains about 60 ℃ deposits thermal storage tank 11 in, transfer out confession life use through heating or water supply network.
Gas/water-to-water heat exchanger 5 in heat-exchanger rig adopts the heat-pipe heat exchanger of being made up of many heat pipes, and heat pipe is a closed structure, and an amount of working media is equipped with in inside, is divided into evaporator section and condensation segment two parts, is a kind of heat transfer element especially efficiently; When high-temperature flue gas during through superheater tube; Heat in the high-temperature flue gas just imports the evaporator section of heat pipe into; Working media in the pipe absorbs the heat of vaporization in the flue gas and flows to condensation segment, discharges the latent heat of vaporization there, and condensation becomes liquid; Under the capillary force or gravity effect of porous wick, return evaporator section then.So repeatedly the circulation, through working medium constantly phase transformation and mass transfer transmit heat repeatedly.High-temperature flue gas is through behind the heat exchange of heat pipe, and temperature is dropped to about 130 ℃ from the highest 500 ℃, is heated to softening circulating hot waters through hot water circulating pump 7 the highlyest 120 ℃, supplies with the next stage plate type heat exchanger, moves in circles.
Water/water-to-water heat exchanger 6 in the two times heat changing device adopts plate type heat exchanger, and this kind heat exchanger is a kind of new type high efficient heat exchanger that is formed by a series of sheet metal closed assemblies with certain bellows-shaped.Form the thin rectangular shape passage between the various plates, carry out exchange heat through half sheet.Plate type heat exchanger is the ideal equipment of water-hydrothermal exchange, and under the uniform pressure damaed cordition, its heat transfer coefficient is than the high 3-5 of pipe heat exchanger times, and floor space is 1/3rd of a pipe heat exchanger, and heat recovery rate can be up to more than 90%.
Industrial furnace residual neat recovering system of the present invention is that case is calculated with two forge furnaces of certain company, and the result is following:
Two forge furnace parameters are consistent: 16 burners, and the combustion natural gas, burner power is 630KW, fire box temperature is 1200 ℃.
Industrial furnace requires: fuel type heating furnace (comprising natural gas, liquefied gas, blast furnace gas, fuel oil)
Industrial furnace maximum heating power: 20160KW
Maximum exhaust smoke level (500 ℃ of exhaust gas temperatures): the 20000m^3/h of industrial furnace
The average heating power of industrial furnace: 10000KW
The average exhaust smoke level of industrial furnace: 10000m^3/h
Exhaust gas temperature before and after the heat exchanger: 400 ℃
Heat exchange of heat pipe heat exchange efficiency: 160 ℃
Average smoke evacuation heat flow: 3500KW
Heat flow: 2100KW is on average reclaimed in a heat exchange
Once softening circulating water flow: 40t/h
Demineralized water advances water temperature before and after the heat exchanger: (110-65) ℃
Plate type heat exchanger efficient: 95%
Total heat exchange efficiency: 30%
Maximum gross electric capacity: 180KW
Conversion back energy regenerative power: 1000KW
Conversion back day economic benefit: 20,000 yuan
Project input cost: 3,000,000 yuan.
Claims (4)
1. industrial furnace residual neat recovering system; Comprise total discharge flue (2) of being connected with a plurality of industrial furnaces (1) smokejack and be connected the waste-heat recovery device on said total discharge flue (2) through smoke exhaust fan (3), it is characterized in that: said waste-heat recovery device is made up of heat-exchanger rig and two times heat changing device; A said heat-exchanger rig is for to be connected on the gas/water-to-water heat exchanger that has intake-outlet (5) on total discharge flue (2) through control valve (4), and said two times heat changing device is the water/water-to-water heat exchanger (6) that has one-level intake-outlet and secondary intake-outlet; The delivery port of said gas/water-to-water heat exchanger (5) is connected through the one-level water inlet of pipeline with water/water-to-water heat exchanger (6), and the one-level delivery port of said water/water-to-water heat exchanger (6) is connected with the water inlet of said gas/water-to-water heat exchanger (5) through pipeline and the hot water circulating pump (7) and the safety valve (8) that are arranged on the said pipeline; Cold water pipeline to be heated is connected through the secondary water inlet of valve with said water/water-to-water heat exchanger (6), and the secondary effluent mouth of said water/water-to-water heat exchanger (6) is connected with thermal storage tank (11) through domestic hot-water's pipeline (9) and domestic hot-water's pump (10) of being arranged on this domestic hot-water's pipeline (9).
2. industrial furnace residual neat recovering system according to claim 1 is characterized in that: said gas/water-to-water heat exchanger (5) is a heat exchange of heat pipe, and said water/water-to-water heat exchanger (6) is a plate type heat exchanger.
3. industrial furnace residual neat recovering system according to claim 1 and 2; It is characterized in that: the total discharge flue (2) behind the said smoke exhaust fan (3) is gentle/be provided with bypass discharge flue (12) between the discharge flue at water-to-water heat exchanger (5) exhaust opening rear portion, said bypass discharge flue (12) is provided with by-pass valve control (13).
4. industrial furnace residual neat recovering system according to claim 1; It is characterized in that: said cold water pipeline to be heated comprises circulation line (14) of drawing from thermal storage tank (11) that is connected in parallel and the water pipe of being introduced by the running water pipe network (15); On said circulation line (14) and water pipe (15), be respectively arranged with opening/shutting valve (16), be in series with control valve (17) at said water pipe (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100683127A CN102589308A (en) | 2012-03-15 | 2012-03-15 | Waste heat recycling system of industrial furnaces |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100683127A CN102589308A (en) | 2012-03-15 | 2012-03-15 | Waste heat recycling system of industrial furnaces |
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| CN2012100683127A Pending CN102589308A (en) | 2012-03-15 | 2012-03-15 | Waste heat recycling system of industrial furnaces |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017557A (en) * | 2013-01-15 | 2013-04-03 | 机械工业第六设计研究院有限公司 | Scaling-free waste heat utilization system |
| CN104075584A (en) * | 2014-07-15 | 2014-10-01 | 中冶南方工程技术有限公司 | Heating furnace smoke waste heat recycling temperature control system and method |
| CN104456914A (en) * | 2014-11-14 | 2015-03-25 | 司红康 | Thermal electricity and thermal water supply system of waste heat recycling pipeline and running method of thermal electricity and thermal water supply system |
| CN104154766B (en) * | 2014-08-28 | 2017-01-11 | 安徽省六安市佳瑞粉末冶金有限公司 | Natural gas tunnel kiln exhaust smoke waste heat recycling pipeline thermoelectricity and hot water supply system |
| CN106482139A (en) * | 2016-08-20 | 2017-03-08 | 苏州舒跃碳吸附剂有限公司 | A kind of off-gas recovery recycles equipment |
| CN111219701A (en) * | 2018-11-23 | 2020-06-02 | 中国石油天然气股份有限公司 | Boiler system |
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| US4340207A (en) * | 1977-02-14 | 1982-07-20 | Dravo Corporation | Waste heat recovery apparatus |
| CN101551198A (en) * | 2009-05-13 | 2009-10-07 | 上海联合水泥有限公司 | Water heater using waste heat of cement clinker cooling machine |
| CN102012169A (en) * | 2010-12-28 | 2011-04-13 | 中冶南方(武汉)威仕工业炉有限公司 | Method for secondarily recycling smoke gas waste heat of continuous annealing furnace |
| CN201844697U (en) * | 2010-10-25 | 2011-05-25 | 湖南思为能源环保有限公司 | Flue gas waste heat recovery device of industrial furnace |
| CN201852429U (en) * | 2010-10-22 | 2011-06-01 | 滕州市科利机电有限公司 | Water heating system utilizing rotary kiln waste heat |
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2012
- 2012-03-15 CN CN2012100683127A patent/CN102589308A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4340207A (en) * | 1977-02-14 | 1982-07-20 | Dravo Corporation | Waste heat recovery apparatus |
| CN101551198A (en) * | 2009-05-13 | 2009-10-07 | 上海联合水泥有限公司 | Water heater using waste heat of cement clinker cooling machine |
| CN201852429U (en) * | 2010-10-22 | 2011-06-01 | 滕州市科利机电有限公司 | Water heating system utilizing rotary kiln waste heat |
| CN201844697U (en) * | 2010-10-25 | 2011-05-25 | 湖南思为能源环保有限公司 | Flue gas waste heat recovery device of industrial furnace |
| CN102012169A (en) * | 2010-12-28 | 2011-04-13 | 中冶南方(武汉)威仕工业炉有限公司 | Method for secondarily recycling smoke gas waste heat of continuous annealing furnace |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017557A (en) * | 2013-01-15 | 2013-04-03 | 机械工业第六设计研究院有限公司 | Scaling-free waste heat utilization system |
| CN104075584A (en) * | 2014-07-15 | 2014-10-01 | 中冶南方工程技术有限公司 | Heating furnace smoke waste heat recycling temperature control system and method |
| CN104075584B (en) * | 2014-07-15 | 2016-06-29 | 中冶南方工程技术有限公司 | A kind of waste heat of flue gas of heating furnace recovered temperature controls System and method for |
| CN104154766B (en) * | 2014-08-28 | 2017-01-11 | 安徽省六安市佳瑞粉末冶金有限公司 | Natural gas tunnel kiln exhaust smoke waste heat recycling pipeline thermoelectricity and hot water supply system |
| CN104456914A (en) * | 2014-11-14 | 2015-03-25 | 司红康 | Thermal electricity and thermal water supply system of waste heat recycling pipeline and running method of thermal electricity and thermal water supply system |
| CN104456914B (en) * | 2014-11-14 | 2017-04-05 | 六安市胜锋暖通工程有限公司 | A kind of application system of waste heat recovery circulation line |
| CN106482139A (en) * | 2016-08-20 | 2017-03-08 | 苏州舒跃碳吸附剂有限公司 | A kind of off-gas recovery recycles equipment |
| CN106482139B (en) * | 2016-08-20 | 2018-07-20 | 苏州舒跃碳吸附剂有限公司 | A kind of off-gas recovery recycling equipment |
| CN111219701A (en) * | 2018-11-23 | 2020-06-02 | 中国石油天然气股份有限公司 | Boiler system |
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Application publication date: 20120718 |