CN105890375A

CN105890375A - Metallurgical furnace smoke waste heat utilizing and dust removing method

Info

Publication number: CN105890375A
Application number: CN201410853313.1A
Authority: CN
Inventors: 王正新
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-12-25
Filing date: 2014-12-25
Publication date: 2016-08-24

Abstract

A metallurgical furnace smoke waste heat utilizing and dust removing method is characterized in that exhaust smoke in a metallurgical furnace is exhausted through a fourth hole and mixed in cold air through a water cooling sliding sleeve and then enters a settling chamber, the smoke passing through the settling chamber enters a cyclone dust collector to be subjected to beforehand dust removing and then enters a waste heat exchange chamber, the high-temperature smoke releases heat, the cooled smoke is mixed with smoke discharged out of an outer exhaust pipeline connected to the upper portion of the electric furnace to enter a sinter-plate dust remover together, and the mixed smoke is pressed into an exhaust cylinder through a main draught fan and exhausted to the atmosphere after being subjected to dust removing. Meanwhile, organic working medium liquid absorbs heat of a smoke waste heat carrier through a low-pressure-level evaporator, a middle-pressure-level evaporator and a high-pressure-level evaporator and then becomes working medium steam, and the working medium steam does work in an organic turbine with a steam supplementing port in an expansion manner, and drives a power generator to generate power. The method is characterized in that R290 is adopted as a circulation organic working medium. According to the method, heat energy in the smoke can be recycled to the maximum degree to be directly converted into high-grade electric energy, the heat efficiency of the method is improved by 31%-36% compared with the heat efficiency of a single-level evaporation organic Rankine cycle, and the environment-friendly effect is good.

Description

Metallurgical furnace flue gas UTILIZATION OF VESIDUAL HEAT IN dust collection method

Technical field

The present invention relates to a kind of metallurgical furnace flue gas UTILIZATION OF VESIDUAL HEAT IN dust collection method, specifically can be to greatest extent Heat energy in recovered flue gas is converted into high-grade electric energy, can improve again dust collection capacity, belong to metallurgical furnace dedusting skill Art field.

Background technology

The purifier of metallurgical furnace flue gas is that metallurgical furnace flue gas generation equipment, UTILIZATION OF VESIDUAL HEAT IN set in the prior art Execute, cleaner unit is sequentially connected with by pipeline.

The waste heat utilization facility the most generally used: water row tube waste heat boiler, heat accumulating type waste-heat boiler reclaim The waste heat of metallurgical furnace flue gas, produces saturated vapor etc..Owing to metallurgical furnace flue gas high temperature fluctuates, dustiness Greatly, light water tubulation waste heat boiler is difficult to apply to the waste heat recovery of metallurgical furnace flue gas.At present, more than heat accumulating type Heat boiler Successful utilization is in metallurgical furnace flue gas waste heat recovery, but owing to the inherent shortcoming of heat exchanger tube (is made Valency is high, the most freeze proof, non-refractory, service life short) so that general at steel industry of heat accumulating type waste-heat boiler And it is also faced with a lot of problem.

Simultaneously as metallurgical furnace flue gas temperature fluctuation is violent, wave amplitude is big, and residual heat system is necessary for being designed to foot Enough big, it is ensured that high-temperature flue gas also can effectively cool down.But actual steam yield is far below the maximum of residual heat system , there is the situation of low load with strong power in evaporation capacity.This just relatively reduces the economic worth of residual heat system, increases The investment of residual heat system.

Summary of the invention

For the problems referred to above, the invention provides metallurgical furnace flue gas UTILIZATION OF VESIDUAL HEAT IN dust collection method, pass through the method Can not only cooling high temperature flue gas efficiently, moreover it is possible to the heat energy in recovered flue gas is converted into high-grade to greatest extent Electric energy, drags dedusting fan, can reduce the exhaust temperature of flue gas simultaneously, improve dust collection capacity, and not shadow Ring the stable and continuous of metallurgical furnace production.

The technical solution adopted in the present invention is as follows:

Metallurgical furnace flue gas UTILIZATION OF VESIDUAL HEAT IN dust collection method, it is characterised in that: in metallurgical furnace of the present invention, smoke discharging is by Four holes are discharged, and water cooled sliding sleeve is mixed into cold wind, enter combustion settling chamber, burning after combusting carbon monoxide gas The effect of expansion chamber is: reduce flue gas flow rate, makes the big dust particle sedimentation carried in flue gas, and the most mixed Entering cold wind, finally burn CO (carbon monoxide converter) gas, the flue gas through combustion settling chamber enters cyclone dust extractor, enters The pre-dedusting of row, subsequently in residual heat exchanging chamber, high-temperature flue gas releases heat, and temperature is down to 80 DEG C, through fall The flue gas of temperature mixes entrance sintered plate dedusting in the lump with the outer discharge pipe being connected to above metallurgical furnace flue gas out Device, dust concentration 3mg/Nm after removing dust³, main air blower press-in aiutage enter air, meanwhile, through supercool Solidifying organic working medium liquid, through the driving of low-pressure stage working medium force (forcing) pump, first in being installed on residual heat exchanging chamber Low-pressure stage vaporizer in absorb fume afterheat carrier heat, become low-pressure stage working substance steam, a road through pipe Road enter the organic turbine of band filling mouth low pressure filling mouth, another road through hiigh pressure stage working medium force (forcing) pump pressurize after, Enter the heat absorbing fume afterheat carrier in hiigh pressure stage vaporizer, become hiigh pressure stage working substance steam, through pipeline Entering the high-pressure admission cylinder of the organic turbine of band filling mouth, working substance steam is expansion work in multistage organic turbine, And driving threephase generator to generate electricity, the electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can After pressure regulation, it is incorporated to electrical network in factory, or is directly fed to electrical equipment use, arrange from the organic turbine of band filling mouth The working substance steam gone out is condensed into saturated liquid by aluminum fin-plate type condenser, enters fluid reservoir, and fluid reservoir can ensure that Low-pressure stage working medium force (forcing) pump continuous pressure, lower by sending into after worker quality liquid pressurization by low-pressure stage working medium force (forcing) pump Arbitrarily downgrade in vaporizer, start new round circulation, from aluminum fin-plate type condenser recirculated water out, pass through bromination Lithium-absorbing formula cryocooled, the temperature of cooling water is down to 10～15 DEG C, is met working substance steam and be condensed into saturated The liquid requirement to cooling water, in aluminum fin-plate type condenser sent into by water circulating pump, starts new round circulation.

It is further characterized by using R290 for circulation organic working medium.

The invention has the beneficial effects as follows: the present invention uses multistage evaporation in the high and low vaporizer of organic working medium Measure, utilizes the low-temperature zone heating of metallurgical furnace flue gas waste heat to produce low-pressure steam, enters the low pressure of organic turbine Filling mouth expansion work, utilizes the high temperature section heating of metallurgical furnace flue gas waste heat to produce high steam, enters organic The high pressure cylinder expansion acting of turbine, it is achieved the step dividing potential drop of organic working medium is heated by metallurgical furnace flue gas waste heat, this Sample just decreases the lack of uniformity of the heat transfer temperature difference between residual heat stream and working medium in heating surfaces at different levels, reduce by The entropy brought in different transfer of heat irreversible loss increases, and its thermal efficiency improves than single-stage evaporation organic Rankine bottoming cycle 31～36%, reduce the exhaust temperature of flue gas, owing to the exhaust temperature of flue gas can maintain 80 DEG C, mould burning Filtrate in plate cleaner unit can be selected for the filtrate that price is low, reduces investment and operating cost, and concentration of emission is low, May insure that discharge dust concentration is at 3mg/Nm³。

Accompanying drawing explanation

Fig. 1 is the process chart realizing the present invention.

In Fig. 1: 1. metallurgical furnace, 2. water-cooled sliding sleeve, 3. combustion settling chamber, outer discharge pipe, 5. whirlwind removes Dirt device, 6. residual heat exchanging chamber, 7. hiigh pressure stage vaporizer, 8. low-pressure stage vaporizer, 9. sinter-plate precipitator, 10. main air blower, 11. aiutages, 12. low-pressure stage working medium force (forcing) pumps, 13. hiigh pressure stage working medium force (forcing) pumps, 14. storages Flow container, the 15. organic turbines of band filling mouth, 16. threephase generators, 17. water circulating pumps, 18 aluminum fin-plate types are cold Condenser, 19. lithium-bromide absorption-type refrigerating machines.

Detailed description of the invention

The invention will be further described below in conjunction with the accompanying drawings:

As shown in Figure 1: metallurgical furnace flue gas UTILIZATION OF VESIDUAL HEAT IN dust collection method step of the present invention is as follows:

Smoke discharging flow 18 × 10 in 50t/h steel-making metallurgical furnace 1⁴Nm³/ h, temperature 1000 DEG C, dust content 25g/Nm³Being discharged by the 4th hole, water cooled sliding sleeve 2 is mixed into cold wind, enters combustion after combusting carbon monoxide gas Burn expansion chamber 3；The effect of combustion settling chamber 3 is: reduces flue gas flow rate, makes the bulky grain powder carried in flue gas Dirt settles, and is suitably mixed into cold wind, finally burns CO (carbon monoxide converter) gas, through the flue gas of combustion settling chamber 3 Entering cyclone dust extractor 5, carry out pre-dedusting, subsequently in residual heat exchanging chamber 6, high-temperature flue gas releases heat, Temperature is down to 80 DEG C, the flue gas through lowering the temperature and the outer discharge pipe 4 being connected to above metallurgical furnace 1 flue gas out Mixing enters sinter-plate precipitator 9, dust concentration 3mg/Nm after removing dust in the lump³, by main air blower 10 row of press-in Inflator 11 enters air, meanwhile, through the organic working medium liquid of condensation, through low-pressure stage working medium force (forcing) pump 12 Driving, first the low-pressure stage vaporizer 7 in being installed on residual heat exchanging chamber 6 absorbs fume afterheat carrier Heat, becomes low-pressure stage working substance steam, and a road enters the low pressure filling of the organic turbine of band filling mouth 15 through pipeline Mouthful, another road, after hiigh pressure stage working medium force (forcing) pump 13 pressurizes, enters in hiigh pressure stage vaporizer 7 and absorbs more than flue gas The heat of heat carrier, becomes hiigh pressure stage working substance steam, enters the high pressure of the organic turbine of band filling mouth 15 through pipeline Entering cylinder, working substance steam is expansion work in multistage organic turbine 15, and drives threephase generator 16 to generate electricity, The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can be incorporated to electrical network in factory after pressure regulation, Or it is directly fed to electrical equipment use, from the working substance steam of band filling mouth organic turbine 15 discharge by aluminum fin-plate type Condenser 18 is condensed into saturated liquid, enters fluid reservoir 14, and fluid reservoir 14 can ensure that low-pressure stage working medium is pressurizeed Pump 12 continuous pressure, then sent after worker quality liquid pressurization into low-pressure stage evaporation by low-pressure stage working medium force (forcing) pump 12 In device 8, start new round circulation, from aluminum fin-plate type condenser 18 recirculated water out, inhaled by lithium bromide Receipts formula refrigeration machine 19 cools down, and the temperature of cooling water is down to 10～15 DEG C, meets working substance steam and is condensed into saturated solution The body requirement to cooling water, in aluminum fin-plate type condenser 18 sent into by water circulating pump 17, starts a new round and follows Ring.

Described low boiling organic working medium is R290, three grades of evaporations, and low-pressure stage evaporating pressure is 0.182MPa, in Evaporating pressure of arbitrarily downgrading is 1.09MPa, and hiigh pressure stage evaporating pressure is 2.58MPa, the power pressure after expansion work During for 0.46MPa, system electromotive power output is 2500KW, and Rankine cycle efficiency is 27.6%, and system is discharged Flue-gas temperature be 80 DEG C.

The maximum feature of the present invention is to use organic working medium measure of multistage evaporation in high and low vaporizer, Reclaim the waste heat of metallurgical furnace flue gas, cooled down from shell-and-tube cooler out by lithium-bromide absorption-type refrigerating machine Recirculated cooling water, cooling water temperature be down to 10～15 DEG C, meet working substance steam and be condensed into saturated liquid pair The requirement of cooling water.

As can be seen here, the inventive method smoke dust discharge concentration is low, and plant investment is low, operation energy consumption is low, purifies Effective.The inventive method can be converted into high-grade electric energy by the heat energy in recovered flue gas to greatest extent, Its thermal efficiency ratio single-stage evaporation organic Rankine bottoming cycle improves 31～36%, moreover it is possible to the environment protecting reached.

Claims

1. metallurgical furnace flue gas UTILIZATION OF VESIDUAL HEAT IN dust collection method, it is characterised in that: in metallurgical furnace of the present invention smoke discharging by 4th hole is discharged, and water cooled sliding sleeve is mixed into cold wind, enters combustion settling chamber, combustion after combusting carbon monoxide gas The effect burning expansion chamber is: reduce flue gas flow rate, makes the big dust particle carried in flue gas settle, and suitably Being mixed into cold wind, finally burn CO (carbon monoxide converter) gas, the flue gas through combustion settling chamber enters cyclone dust extractor, Carrying out pre-dedusting, subsequently in residual heat exchanging chamber, high-temperature flue gas releases heat, and temperature is down to 80 DEG C, warp The flue gas of cooling mixes entrance sintered plate in the lump and removes with the outer discharge pipe being connected to above metallurgical furnace flue gas out Dirt device, dust concentration 3mg/Nm after removing dust³, main air blower press-in aiutage enter air, pass through meanwhile The organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, is first being installed on residual heat exchanging chamber Interior low-pressure stage vaporizer absorbs the heat of fume afterheat carrier, becomes low-pressure stage working substance steam, a road warp Pipeline enter the organic turbine of band filling mouth low pressure filling mouth, another road through hiigh pressure stage working medium force (forcing) pump pressurize after, Enter the heat absorbing fume afterheat carrier in hiigh pressure stage vaporizer, become hiigh pressure stage working substance steam, through pipeline Entering the high-pressure admission cylinder of the organic turbine of band filling mouth, working substance steam is expansion work in multistage organic turbine, And driving threephase generator to generate electricity, the electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can After pressure regulation, it is incorporated to electrical network in factory, or is directly fed to electrical equipment use, arrange from the organic turbine of band filling mouth The working substance steam gone out is condensed into saturated liquid by aluminum fin-plate type condenser, enters fluid reservoir, and fluid reservoir can ensure that Low-pressure stage working medium force (forcing) pump continuous pressure, lower by sending into after worker quality liquid pressurization by low-pressure stage working medium force (forcing) pump Arbitrarily downgrade in vaporizer, start new round circulation, from aluminum fin-plate type condenser recirculated water out, pass through bromination Lithium-absorbing formula cryocooled, the temperature of cooling water is down to 10～15 DEG C, is met working substance steam and be condensed into saturated The liquid requirement to cooling water, in aluminum fin-plate type condenser sent into by water circulating pump, starts new round circulation.

Metallurgical furnace flue gas UTILIZATION OF VESIDUAL HEAT IN dust collection method the most according to claim 1, it is characterised in that: adopt It is circulation organic working medium with R290.