CN1086740C

CN1086740C - Technology and equipment for annealing malleable iron

Info

Publication number: CN1086740C
Application number: CN99119251A
Authority: CN
Inventors: 王昌林
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-30
Filing date: 1999-08-30
Publication date: 2002-06-26
Anticipated expiration: 2019-08-30
Also published as: CN1286313A

Abstract

The present invention relates to technology for annealing malleable steel and an exclusive-use device thereof. The technology comprises the steps of generating coal gas, removing the dust of the coal gas and annealing the malleable steel. The exclusive-use device is a simple mixed coal-gas generating furnace which is used for generating the coal gas and is composed of a coal adding opening, a gasifying agent inlet, a coal gas outlet, an upper water sealing component, a lower water sealing component, a manhole, a dust hooking opening, a furnace grate, a fire resistant layer, an inner bladder, an outer shell, a level meter and a pressure gauge. Compared with the technology of combusting powder coal, because the technology uses the self-produced hot coal gas as fuel for the annealing operation, the fume emission of an annealing kiln reaches the first-stage emission standard specified by China, the kiln warm is uniform, and the quality of the annealed product is improved. In addition, the working condition is greatly improved.

Description

Malleable iron annealing process and equipment thereof

The present invention relates to a kind of malleable iron annealing process and the simple and easy mixed gas producer of specific equipment thereof.

Existing malleable iron annealing process (as a large amount of malleable iron factory of Shanxi Taigu County) is with the coal powder injection machine fine coal directly to be sprayed into the annealing furnace internal combustion to carry out annealed technology, this processing method since in the stove temperature rise inhomogeneous, seriously influenced the quality of product; Coal dust firing not exclusively makes chimney, and Dark smoke billows, and smoke dust discharge concentration is up to 5502.3mg/Nm ³, caused the serious environmental pollution.In addition, operator's labor condition is also very abominable.

The objective of the invention is to develop a kind of environment protection standard, temperature rise is even, labor condition is good malleable iron annealing process and equipment thereof.

Malleable iron annealing process of the present invention is made up of coal gas generation, coal gas dust removal and three steps of malleable iron annealing, it is characterized in that adopting simple and easy mixed gas producer generation coal gas.

1. coal gas takes place

Adopt a kind of custom-designed simple and easy mixed gas producer, this stove is taken into account tensimeter and is constituted by coal filling hole, ash output hole, gasification agent inlet, gas exit, grate, inner bag, shell, flame retardant coating, hand-hole, hook ash mouth, water seal up and down, liquid level, raw material is the lump coal of 25-80mm, vaporized chemical is steam and AIR MIXTURES, temperature of saturation is 55-60 ℃, and steam is provided by the stove chuck.

2. coal gas dust removal

450-650 ℃ the heating gas that producer produces obtains cleaner heating gas after general cyclonic separator dedusting.

3. malleable iron annealing

Utilize the annealing furnace of original burning fine coal, uniform several gas burners, the above-mentioned heating gas that burns makes the annealing kiln temperature up to 950-960 ℃, and malleable iron is annealed in kiln.

The embodiments of the invention accompanying drawings is as follows:

Fig. 1 is a malleable iron annealing process schema.

Fig. 2 is simple and easy mixed gas producer structural representation.

As shown in the figure, 1 is gas inlet, and 2 is the steam-in, and 3 is simple and easy mixed gas producer, 4 is tornado dust collector, and 5 are the combustion air inlet, and 6 is the malleable iron annealing furnace, and 7 is chimney, 8 is coal filling hole, and 9 is last water seal, and 10 is gas exit, and 11 is flame retardant coating, 12 is shell, and 13 is vapour pipe, and 14 is inner bag, and 15 is grate, 16 is gasification agent inlet, and 17 are water seal down, and 18 is ash output hole, and 19 is hook ash mouth, 20 is hand-hole, and 21 is liquid level meter, and 22 is tensimeter.

Malleable iron annealing process step is as follows:

1. air that is fed by inlet 1 and the steam that fed by inlet 2 feed in the producer 3 as vaporized chemical, and making granularities in the producer 3 is that the lump coal gasification of 25-80mm produces mixed gas;

2. mixed gas mixes with combustion air 5 after cyclonic separator 4 dedustings;

3. will light with combustion air 5 mixed coal gas, send in the malleable cast iron pipe fitting annealing furnace 6, and make kiln temperature rise to 950-960 ℃ of regulation annealing temperature;

4. waste gas after burning then enters atmosphere by several venting holes of both sides, annealing furnace 6 bottom through chimney 7.

Malleable cast iron pipe fitting annealing process condition is as follows:

Lump coal granularity 25-80mm

450-650 ℃ of gas furnace temperature out

Air vapor is mixed into 55-60 ℃ of stove temperature of saturation

The chuck water level is not less than 2/3 of liquidometer

Jacket steam pressure 0.5-10KPa

Stove is the about 200mmH of water seal height up and down ₂The O post

Combustion-supporting air quantity is regulated according to the gas-fired situation

Interior top temperature 950-960 ℃ of annealing furnace

Soaking time 10-12 hour

10-12 hour air cooling time

The result of discharging waste gas tracking monitor is as follows:

Dust concentration 58.8mg/Nm ³

SO ₂Concentration 108.7mg/Nm ³

CO concentration 6.8mg/Nm ³

CH concentration 13.4mg/Nm ³

The using method of described simple and easy mixed gas producer is as follows:

1. when driving, open hand-hole 20, put firewood in the stove and light, add lump coal in good time, intensification burns away;

Chuck, water seal is supplied water by special water pipe up and down;

3. raw material lump coal is added by furnace roof portion coal filling hole 8, and air, steam are by furnace bottom, and gasification agent inlet 16 blows in the stove, and the coal gas of generation is by stove top gas exit 10, and causing needs the place;

4. the water in the chuck is introduced in the stove and is used because the vaporization of being heated produces steam, and a small amount of excess steam is discharged by blow-down pipe;

5. coal aerogenesis intermittently, air, steam are supplied with by furnace bottom also corresponding intermittence.

The present invention compares with existing malleable iron annealing process, and its significant technological progress is as follows:

1. obtained good environmental benefit, soot emissions are from 5502.3mg/Nm³, be down to 58.8mg/Nm³Reached first discharge standard (the smoke content 100mg/Nm of national regulation³Below).

2. firing coal dust is changed into the burning heating gas, greatly improved workman's working condition.

3. uniform thermal gas burner makes kiln temperature more even, has improved the quality of annealing product.

4. use the original annealing kiln that burns fine coal, save investment, easy to utilize.

5. save the disintegrating apparatus of coal, saved investment, reduced power consumption.

6. adopt heating gas to make fuel and replace original coal dust, a Simple mixed gas producer furnace can Use for a plurality of annealing kilns, reduced energy consumption and cost.

7. oxidation obviously reduces in the kiln, can without the high chromium annealing circle of high price, prolong common fire-resistant In the service life of circle, used about 20 times by originally using to extend to about 13 times.

Claims

1. malleable iron annealing process is characterized in that described processing step and parameter are as follows:

(1) fed in the producer (3) as vaporized chemical by air of (1) feeding that enters the mouth and the steam that is fed by inlet (2), making the interior granularity of producer (3) is the lump coal gasification generation mixed gas of 25-80mm;

(2) mixed gas mixes with combustion air (5) after cyclonic separator (4) dedusting;

(3) will light with the mixed coal gas of combustion air (5), send in the malleable cast iron pipe fitting annealing furnace (6), and make kiln temperature rise to 950-960 ℃ of regulation annealing temperature;

(4) waste gas after burning then enters atmosphere by several venting holes of annealing furnace (6) both sides, bottom through chimney (7);