CN202465758U - Converter gas purifying and recycling system - Google Patents

Abstract

The utility model provides a converter gas purifying and recycling system. The converter gas purifying and recycling system comprises a wet spinning dehydrator, wherein a pipeline with a coal gas fan is connected behind the wet spinning dehydrator; a wet electrostatic dust collector is connected behind the wet spinning dehydrator; and an automatic explosion relief valve is arranged on the wet electrostatic dust collector; and when the pressure in equipment exceeds a limited pressure, the automatic explosion relief valve automatically returns after explosion is relieved. According to the utility model, as a primary wet electrostatic dust collector is additionally arranged on the original structure, the system is simple to remodel and the equipment resistance of the wet electrostatic dust collector is small; and as an automatic explosion relief device and a coal gas blow off valve are arranged on a shell, safety and reliability are obtained during working and overhauling. Through a mounted online explosion relief device, when the pressure in equipment exceeds a limited pressure, the online explosion relief device automatically returns after explosion is relieved. According to the utility model, dust in the gas can be efficiently removed, micro fine particles of less than 1 micron can be separated, and average content concentration of 10 mg/Nm3 and maximum content concentration of 15 mg/Nm3 of the gas at an outlet of the dust collector can be achieved.

Description

A kind of converter gas purification recovery system

Technical field

The utility model relates to a kind of converter gas purification recovery system of metallurgy industry process for making.

Background technology

Converter produces the high-temperature flue gas that contains a large amount of CO brown iron oxides when blowing; In order to prevent to pollute; The protection environment; In traditional converter gas purification recovery system; Usually adopt the gas cleaning dust-removal system of old OG method, as shown in Figure 1, connect successively after the converter 1 through gasification cooling flue and be connected with overflow sizing Venturi meter 3, gravity dehydration device 4, RD is adjustable 5,90 ° of elbow separators 6 of Venturi meter, water smoke separator 7, wetly revolve water trap 8, gas fan 12, by-pass valve 13, three-way switch valve 14, water seal reverse checkvalve 15, diffuse chimney 16, portfire 17, the water seal 18 of U type and gas chamber 19.Dust content after this dust collecting process is handled is still very high, and dust contained flue gas concentration is average ~ 100 mg/Nm ³Because dustiness is big, the coal gas in the gas chamber needs could satisfy customer requirements (dust content through after the efficient purifying treatment once more<15 mgNm ³).According to " Iron And Steel Industry atmosphere pollutants emission standards " exposure draft of State Environmental Protection Administration's establishment, this kind system dust emission concentration is difficult to satisfy environmental requirement.

For implementing the industry policy of national energy-saving and emission-reduction, actively carry out cleaning production, must transform the dust-removal system that does not satisfy emission standard.If existing dust-removal system is carried out comprehensive renewal and reform, replace with technologies such as new system or dry method, will certainly cause great waste, increased improvement cost.In addition, owing to receive condition restriction such as narrow, the old workshop steel structure in place is crisscross, difficulty of construction is big, transform difficulty in the transformation process.

The utility model content

The purpose of the utility model provides the little converter gas purification recovery system of a kind of dust emission concentration.

To achieve these goals; Adopt following technical scheme: a kind of converter gas purification recovery system; Comprise the wet water trap that revolves, the wet water trap that revolves is connected with the pipeline that has gas fan afterwards, it is characterized in that: the said wet water trap that revolves is connected with wet cottrell afterwards.

As further optimization, in order to guarantee the safety of wet cottrell, said wet cottrell is provided with automatic explosion venting valve, when the equipment internal pressure surpasses qualification pressure, automatically resets behind the venting of dust explosion.

The utility model has increased the one-level wet cottrell on original structure, the system reform is simple, and the wet cottrell equipment resistance is little, and usually less than 300Pa, and treatable gas vol is big, can be used for higher temperature.Its increase is (the about 25000Pa of system's total head) for existing system; Drag losses can be ignored; The wet cottrell housing has enough compressive strengths simultaneously, and the side plate internal surface scribbles proprietary conductive anti-corrosion coating, prolongs the work-ing life of equipment.Housing is provided with automatic explosion venting device and gas bleeding valve, work and the maintenance safe and reliable.Through installing online explosion venting device, when the equipment internal pressure surpasses qualification pressure, automatically reset behind the venting of dust explosion.

To sum up, the utility model can carry out high-effective dust-removing to flue gas, can separate the subparticle less than 1 μ m, can realize that fly-ash separator outlet dust contained flue gas concentration is average<10 mg/>Nm ³, maximum 15 mg/Nm ³

Description of drawings

Fig. 1 is traditional converter gas purification recovery system figure;

Fig. 2 is the structure iron of the utility model.

Among the figure; Part 1 is converter; Part 2 is a gasification cooling flue, part 3 for overflow sizing Venturi meter, part 4 for gravity water trap, part 5 for the adjustable Venturi meter of RD, part 6 be 90 ° of elbow separators, part 7 for water smoke separator, part 8 for wet revolve water trap, part 9 for wet cottrell, part 10 for automatic explosion venting valve, part 11 for water seal hydathode, part 12 for gas fan, part 13 for by-pass valve, part 14 for three-way switch valve, part 15 for water seal reverse checkvalve, part 16 for diffuse chimney, part 17 is gas chamber for portfire, part 18 for the water seal of U type, part 19.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further:

Wet cottrell is existing matured product; Its principle of work forms closed electric field for to apply high voltage electric through the anticathode line between cathode frame and the positive plate, form electric current through static induction; To impact through the dust granules in the electric field air-flow; Make dust wherein have positive charge and negative charge respectively, utilize electrostatic force (Coulomb's force) that dust in the gas or drop separation are come out, be adsorbed on respectively on cathode rays and the positive plate.The dust that dust collector pole is trapped adopts water spray overflow or appropriate means to form water membrane on the dust collector pole surface, the bottom discharge that makes the dust that is deposited on the fly-ash separator and water flow to fly-ash separator together.

As shown in Figure 2, a kind of converter gas purification recovery system, converter 1 produces the high temperature dust flue gas when oxygen blast is smelted; Be cooled to about 900 ℃ through gasification cooling flue 2, after entering overflow sizing Venturi meter 3, the thick dedusting of gravity dehydration device 4 coolings, carry out smart dedusting through the adjustable Venturi meter 5 of RD again; Slightly dewater through 90 ° of elbow separators 6 then; Water smoke separator 7, wet water trap 8 essences of revolving are dewatered, and most of dust and water smoke are removed, and gas temperature is reduced to about 60 ℃ simultaneously.Coal gas inserts wet cottrell 9 through wet revolving after water trap 8 carries out processed outside the workshop, flue gas is carried out high-effective dust-removing, and outlet dust contained flue gas concentration is average<10 mg/>Nm ³, maximum<15 mgNm ³Behind gas fan 12, when CO content reached set(ting)value, T-valve 14 switched to the recovery state, passed through water seal reverse checkvalve 15, U type water seal 18, gas chamber 19 successively; Otherwise T-valve 14 switches to the state of diffusing, and flue gas is through diffusing the portfire 17 altitude combustions discharging at chimney 16 tops.

The mud that wet cottrell is collected; Send into the turbid circulating water water treatment system through steam piano; The entering tilted plate separator carries out the water of post precipitation from flowing into the turbid circulating water hot tub; After the pressurization of pump group, send cooling tower to cool off, cooled water gets into the turbid circulating water water cooling pond, pumps up to supply dust-removal system to recycle again.The coarse particles that the coarse particles separating machine is removed is transported with automobile, and the mud that tilted plate separator precipitates flows into suction pit, adds the force feed sludge treating system through pump and handles.Certainly, also can be at the other independently settling tank processing mud that is provided with of wet cottrell.

Claims (2)

1. a converter gas purification recovery system comprises the wet water trap that revolves, and the wet water trap that revolves is connected with the pipeline that has gas fan afterwards, it is characterized in that: the said wet water trap that revolves is connected with wet cottrell afterwards.

2. converter gas purification recovery system as claimed in claim 1 is characterized in that: said wet cottrell is provided with automatic explosion venting valve, when the equipment internal pressure surpasses qualification pressure, automatically resets behind the venting of dust explosion.

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