CN101264404A

CN101264404A - Metallurgical furnace flue gas negative energy dust removing exhaust heat recovering method and special purpose equipment

Info

Publication number: CN101264404A
Application number: CNA200810025075XA
Authority: CN
Inventors: 顾福明
Original assignee: WUXI GUOSONG ENVIRONMENTAL PROTECTION MACHINERY CO Ltd
Current assignee: WUXI GUOSONG ENVIRONMENTAL PROTECTION MACHINERY CO Ltd
Priority date: 2008-05-06
Filing date: 2008-05-06
Publication date: 2008-09-17

Abstract

The invention provides a residual heat recovery method of negative energy dedust of metallurgy kiln gas. According to the method, not only the heat energy of the flue gas can be recovered maximally, and the stability and concatenation of steelmaking production of metallurgy furnace is not influenced, but also great dust removal effects can be achieved, and the dust concentration is less than 20mg/Nm; for achieving the purposes, the invention also provides a specialized equipment using the recovery method. The residual recovery method is characterized in that: after the high temperature flue gas of metallurgy furnace is purified by the sack dust collector, the flue gas passes through the smoke flue into the finned tube heat exchanger to finish heat exchange. The finned tube heat exchanger produces the vapor meeting the requiring parameters of users for production and living, or providing the steam turbine for power generation. Dragging the fan to finish residual heat recovery, and achieve the negative energy dedust, and the flue gas from the finned tube heat exchanger is finally discharged into air by an exhaust funnel. The residual heat recovery specialized equipment is characterized in that: a combust settling chamber is sequentially connected with the dust collector, the finned tube heat exchanger by a heat insulation smoke flue, and the flue gas discharge port of the heat exchanger is connected with the exhaust funnel by a major fan. The medium outlet of the heat exchanger is connected with a vapor concentrator, and the concentrator is connected with an accumulator.

Description

Metallurgical furnace flue gas negative energy dust removing exhaust heat recovering method and special equipment

(1) technical field

The present invention relates to metallurgical furnace flue gas negative energy dust removing exhaust heat recovering method, the invention still further relates to metallurgical furnace flue gas negative energy dust removing waste heat recovery special equipment.

(2) background technology

Metallurgical furnace (electric furnace, converter, the hot stove in ore deposit, heating furnace, furnace cupola) steel-making flue-gas temperature is very high, after capturing

Generally about 600 degrees centigrade, dust concentration reaches 15g/Nm to the temperature that enters pipeline, accounts for more than 70% of dust total amount less than the ash of 10um, and Dust Capacity is big, and sticking and thin.Usually (the heat exchange cooling method has: mechanical cooler heat exchange, spraying cooling heat transferring, residual heat boiler for exchanging heat etc. to adopt first heat exchange cooling at present.) back dedusting method.There are many shortcomings in the method for elder generation's heat exchange cooling back dedusting:

1, dedusting after the mechanical cooler heat exchange (cooling-down effect is poor, and input gas temperature should not be greater than 500 degrees centigrade, and cooling is limited in scope, and the stifled easily ash of machine cooler tube wall causes the burning cloth bag, and system can't normally move);

2, dedusting behind the spraying cooling heat transferring (increase the content of water in the flue gas, cloth bag is hardened, also cause water and dust bonding easily, cause system equipment to stop up);

3, dedusting after the residual heat boiler for exchanging heat is (owing to contain a large amount of dust in the flue gas, even dust stratification, clogging appear in sticking and thin dust on the heat-pipe elements of light pipe, heat-pipe elements dust stratification, obstruction for the hoop finned tube are more serious, not only influence heat exchange efficiency, waste heat boiler steam production deficiency, even more serious is because waste heat boiler is stifled grey, system's fluctuation of service, cause to smelt to produce and normally to carry out the maintenance of being forced to stop production).

Because above shortcoming, adopt many ash-blowing methods in the engineering, as shock-wave ash blowing, steam soot blowing, ball deashing etc. falls, but owing to dust carefully glues and measures big, one ton of molten steel of every production will produce 30 kilograms of dust, therefore these ash removal methods produce little effect, and can't fundamentally solve dust stratification, blockage problem.

(3) summary of the invention

At the problems referred to above, the invention provides metallurgical furnace flue gas negative energy dust removing exhaust heat recovering method, can not only reclaim heat energy in the flue gas to greatest extent, and do not influence the stable of metallurgical furnace STEELMAKING PRODUCTION and continuously by this method, can also obtain good dust removing effects, dust concentration is less than 20mg/Nm; For achieving the above object, the present invention also provides a kind of special equipment that uses this recovery method.

The technical solution adopted in the present invention is as follows: metallurgical furnace flue gas negative energy dust removing exhaust heat recovering method, it is characterized in that: the metallurgical furnace high-temperature flue gas enters finned tube exchanger by the insulation flue after sack cleaner purifies, finish heat exchange, finned tube exchanger produces the steam that reaches the customer requirements parameter, be used for producing, living, or supply with steam turbine power generation, drag blower fan, finish waste heat recovery, realize negative energy dust removing, the flue gas by finned tube exchanger comes out finally enters atmosphere through aiutage;

Metallurgical furnace flue gas negative energy dust removing waste heat recovery special equipment, it comprises deduster, combustion settling chamber, finned tube exchanger, it is characterized in that: described combustion settling chamber is by insulation flue be linked in sequence deduster, finned tube exchanger, the flue gas discharge opening of described heat exchanger connects aiutage by main air blower, the media outlet of described heat exchanger connects the steam collector, and described collector connects storage heater.

It is further characterized in that: described deduster is a high temperature resistant stainless steel Nomex filtrate sack cleaner.

Compared with prior art, the present invention has following advantage: reclaim fume afterheat to greatest extent, produce steam and be used for productive life, or supply with steam turbine power generation or drag blower fan; Satisfy the requirement of recycling economy like this, meet the national policy of energy-saving and emission-reduction, owing to adopt heat exchange after the first dedusting, finned tube exchanger dust stratification does not stop up like this, and finned tube exchanger is reliable, stablize; And high temperature resistant stainless steel Nomex filtrate sack cleaner, better dust removal effect has guaranteed that further finned tube exchanger dust stratification, clogging can not occur.

(4) description of drawings

Fig. 1 is a structural representation of the present invention;

The structural representation that Fig. 2 looks for the finned tube exchanger master;

Fig. 3 is that the E of finned tube exchanger among Fig. 2 is to schematic diagram.

(5) specific embodiment

See Fig. 1, Fig. 2, Fig. 3, metallurgical furnace flue gas negative energy dust removing waste heat recovery special equipment comprises high temperature resistant stainless steel Nomex filtrate sack cleaner 4, finned tube exchanger 5, combustion settling chamber 3 among the present invention, combustion settling chamber 3 is by insulation flue be linked in sequence high temperature resistant stainless steel Nomex filtrate sack cleaner 4, finned tube exchanger 5, the flue gas discharge opening of heat exchanger 5 connects aiutage 9 by main air blower 8, the media outlet of heat exchanger 5 connects steam collector 6, and collector 6 connects storage heater 7.

Below in conjunction with accompanying drawing metallurgical furnace flue gas negative energy dust removing waste heat recovery process is described, discharged flue gas is discharged by the 4th hole in the electric furnace 1, sneak into cold wind through water-cooled sliding sleeve 2, enter combustion settling chamber 3 behind the burning CO gas, the effect of combustion settling chamber 3 is the flow velocitys that reduce flue gas, makes the big dust particle sedimentation of carrying in the flue gas, and suitably sneak into cold wind, final after-flame carbon monoxide, the flue gas that is come out by combustion settling chamber 3 enters sack cleaner 4, and dust concentration is less than 20mg/Nm after dedusting ³Enter finned tube exchanger 5 then and finish heat exchange with feedwater, temperature is reduced to about 120 degrees centigrade, is pressed into aiutage 9 by main air blower 8 and enters atmosphere.Simultaneously, main feedwater produces steam after finned heat exchanger 5 absorbs fume afterheat, enter flue gas collector 6, enter steam accumulator 7 by main steam line, supply steam stable, continuous, that parameter meets customer requirements to dare to producing, live or the supply steam turbine power generation outside after regulating, drag blower fan, finish waste heat recovery, realize negative energy dust removing, among Fig. 2, Fig. 3,10 is that gas approach, 11 is that exhanst gas outlet, 12 is that heat exchanging part, 13 is that middle connection, 14 is that vapor uptake interface, 15 is a steam down-comer interface.

Claims

1, metallurgical furnace flue gas negative energy dust removing exhaust heat recovering method, it is characterized in that: the metallurgical furnace high-temperature flue gas enters finned tube exchanger by the insulation flue after sack cleaner purifies, finish heat exchange, finned tube exchanger produces the steam that reaches the customer requirements parameter, be used for producing, living, or supply with steam turbine power generation, drag blower fan, finish waste heat recovery, realize negative energy dust removing, the flue gas by finned tube exchanger comes out finally enters atmosphere through aiutage;

2, metallurgical furnace flue gas negative energy dust removing waste heat recovery special equipment, it comprises deduster, combustion settling chamber, finned tube exchanger, it is characterized in that: described combustion settling chamber is by insulation flue be linked in sequence deduster, finned tube exchanger, the flue gas discharge opening of described heat exchanger connects aiutage by main air blower, the media outlet of described heat exchanger connects the steam collector, and described collector connects storage heater.

3, according to the described metallurgical furnace flue gas negative energy dust removing waste heat recovery of claim 2 special equipment, it is characterized in that: described deduster is a high temperature resistant stainless steel Nomex filtrate sack cleaner.