CN2305405Y

CN2305405Y - Bubbling bed powder coal gas generating furnace

Info

Publication number: CN2305405Y
Application number: CN 97202018
Authority: CN
Inventors: 洪敦焕
Original assignee: Fushun Ende Machinery Co ltd
Current assignee: Fushun Ende Machinery Co ltd
Priority date: 1997-03-12
Filing date: 1997-03-12
Publication date: 1999-01-27
Anticipated expiration: 2007-03-12

Abstract

The utility model relates to a pulverized coal gas generating furnace of a bubbling bed, which is provided with furnace body (3) and a heat resistance layer (4). A coal gas outlet (1) is provided with a cone cylinder (7) with a cone angle alfa, which is arranged at the lower part of the furnace body (3), and a heat preservation layer (9) is arranged in the cone cylinder. The lower part of the cone cylinder is provided with a coal ash outlet (10), and the middle part of the cone cylinder (7) is provided with a coal inlet (6). A lower nozzle (8) is arranged below the coal inlet, and an upper nozzle (5) is arranged above the coal inlet. The proper cone angle of the cone cylinder ensures that coal ash moves downwards, and thus, the generating furnace is not provided with a furnace grate. The bubbling bed can completely react, and has a two-time gasification function. Thus, the gasification intensity is increased, and the utility model has the advantages of simple structure, convenient operation, convenient ash discharge and high use effect of the furnace.

Description

Ebullated bed fine coal gas producer

The utility model relates to by solid carbon-contg material production producer gas, water-gas, synthetic gas or produce the mixture of these gases; The carburetting of air or other gases is particularly contained the inflammable gas of carbon monoxide, its unit by the solid carbon-containing fuel manufacturing.

The industrial now device that is used for gasification has many kinds, wherein higher a kind of of efficient is the ebullated bed producer gas generator, the structure (grate) of particulate exchange velocity and its air supply device has much relations in this producer fluidized bed, air supply device generally can be divided into spraying type, eddy current type, combined type fire grate etc.

In aerosol fire grate, the air feed mouth is vertical with the fire grate plane, flows the motion of only going forward side by side according to fire grate distribution coal gas, and the shortcoming of this fire grate is the dead band that forms the accumulation solid phase particles that can not move between the air feed mouth.

In the eddy current type fire grate, the air feed mouth is arranged with different angle, and at this moment the coal gas in the device flows the motion of not only going forward side by side, and rotates.

The combined type fire grate is the combination of above-mentioned two kinds of fire grates.

But, have the producer gas generator of fire grate, have the common shortcoming:

1, gasification intensity can not improve, and as mentioned above, fire grate has barrier, reduces pneumatization, produces the dead band, and the boiling condition is restricted.

2, no matter the rake formula still is the chain type ash disposal, and ash discharge is all difficult, also suffers a loss in the coal seam.

3, complex structure, the structure of fire grate and ash disposal mechanism is all very complicated, needs often maintenance.

The purpose of this utility model is for overcoming above-mentioned shortcoming, a kind of no fire grate being provided, and is simple in structure, is convenient to ash discharge, can improve the ebullated bed fine coal gas producer of gasification intensity.

The purpose of this utility model realizes by following technical scheme, ebullated bed fine coal gas producer has an axial round shape shaft, has heat-resistant layer in the shaft, gas exit and manhole are arranged at the top, its feature is in cone angle alpha=30-70 ° the conic tube that also has at restoration of lower stack, heat-resistant layer in the conic tube, the ash output hole of conic tube bottom, coal inlet on the conic tube, bottom nozzle below coal inlet, the input of fine coal self-coal-inlet, vaporized chemical is sprayed into by the bottom nozzle that is located at the coal inlet below, coal dust is dispersed and most of gasification, formation carbon monoxide realized in fluidized bed rapidly, reacted coal ash freely glides and drops out from ash output hole by the suitable angle of cone in the conic tube that falls to stove below.And be transported away by handling machinery.So finish production coal gas craft process.

Can also have the top nozzle above coal inlet, not vaporized coal dust vaporized chemical upwards unsteady and that sprayed into by the top nozzle gasifies, and has improved gasification intensity.

In the coal gas that the air outlet is sent, contain dust, can be through dust removal process, the recovery coal inlet that the coal dust of gained can be located on the conic tube at coal inlet place certainly inputs to burner hearth.

The centerline direction of bottom nozzle and top nozzle also can be the drift angle that has certain angle with the radial direction of shaft, forms eddy current in order to coal dust in stove, can improve gasification intensity.

Ebullated bed fine coal gas producer of the present utility model, fire grate is not established in the bottom, improved the gasification condition of fine coal in stove greatly, according to the preliminary statistics, can make the producer ability of same diameter improve 2-3 doubly, and can to utilize low grade coal (as brown coal) be raw material, ash accumulates the back natural downslide in conic tube, control the surface elevation of ash by the handling machinery of ash output hole bottom, help boiling and gasification reaction, and do not need the ash discharge operation and saved ash discharge mechanism, simplified mechanical means and operation sequence greatly.

According to stove footpath and product requirement, but the appropriate change vaporized chemical spray into angle, make to produce eddy current in the stove, help the improvement of the state of fluidized bed, thereby also can improve gasification intensity.

Below, in conjunction with the accompanying drawings and embodiments ebullated bed fine coal gas producer of the present utility model is explained in detail.

Fig. 1 is the sectional view of the utility model ebullated bed fine coal gas producer.

As Fig. 1, this ebullated bed fine coal gas producer has an axial round shape shaft 3, has heat-resistant layer (for example fire brick layer) 4 in the shaft, shaft 3 tops have gas exit 1, also has manhole 2 on the shaft 3, gas exit 1 can be taken over line and will contain particulate coal gas and draw, the bottom of shaft 3 has conic tube 7, heat-resistant layer 9 is also arranged in the conic tube 7, has ash output hole 10 in the bottom of conic tube 7, have some coal inlets 6 on the conic tube, coal dust can be used spiral conveyer, and equipment such as quantitative rotory feeder are delivered into burner hearth in hopper, below coal inlet, conic tube is provided with the bottom nozzle 8 that is uniformly distributed along the circumference, and also has fire hole 12, ash penetration hole 13.

(general moisture content is below 20% for the following fine coal of 10mm after drying is handled, calorific value is not less than 4000 kilocalories/kilogram and can uses) self-coal-inlet 6 (the being generally 1-6) coal of constantly in stove, supplying raw materials, vaporized chemical (for example gas mixture of the gas mixture of oxygen and steam or air and steam) is sprayed into by several (for example 2-8) uniform nozzles 8 that are located at coal inlet 6 belows, pulverized coal particle is dispersed rapidly, tomography is formed on the bottom of stove, the coal dust that is blown to is at least 80% realization gasification in fluidized bed, fluidized bed in stove, coal dust is heated to 900-950 ℃ very soon, resolve into volatile matter through coking and carbonization process, decompose once more.Promptly mainly be that the oxidising process of carbon and carbon combine with water or carbonic acid gas and produces the process of carbon monoxide, reacted coal ash drops down onto by deadweight in the conic tube 7 of bottom of stove, the angle [alpha] of conic tube should be 30-70 °, so that ash glides smoothly and can not stop up, ash output hole can have valve for 10 times or worm conveyor is constantly removed coal ash, and makes the red dog in the conic tube remain on certain altitude.

Above coal inlet 6, also can have top nozzle 5, not vaporized coal dust upwards floats and is gasified by the vaporized chemical that sprays in the top nozzle 5 (for example 6-14), therefore can improve the gasification intensity of stove.

On conic tube 7, also can have the coal of recovery inlet 11, can be by the coal gas that gas exit 1 is drawn through wherein contained pulverized coal particles of removing such as whirlwind cleaners, again through the used heat utilization, dedusting, processes such as cleaning etc. and with fuel gas output, the pulverized coal particle of clearing out of then can reclaim coal inlet 11 certainly and transport in the stove once more and gasify.

Said

nozzle

8 and 5 preferably has certain angle in the same way by the radial direction of the cross section of stove and is provided with, and can make the raw material coal dust form eddy current to improve gasification intensity in stove like this.How much relevant this angle is with furnace diameter and nozzle.

Ebullated bed fine coal gas producer of the present utility model bottom is provided with conic tube and does not establish fire grate, do not produce the dead band, vaporized chemical sprays into from the conic tube place, form fluidized bed, flow in the fluidized bed fully, therefore gasification fully, also can have the top nozzle and carry out second gasification, therefore improve gasification degree, reacted coal ash drops down onto in the conic tube by deadweight, conic tube has suitable cone angle, coal ash can be glided voluntarily and discharge, removed the work of scratching in the ashes from, also the coal in coal seam can not clawed by ash output hole, make mechanism simplifying and simplified working routine, ensured stove long-time running and reliability.

Claims

1, a kind of ebullated bed fine coal gas producer, has shaft (3), heat-resistant layer (4), gas exit (1), manhole (2), fire hole (12), it is characterized in that also having cone angle alpha=30-70 ° conic tube (7), the heat-resistant layer (9) in the conic tube, the ash output hole of conic tube bottom (10) in shaft (3) bottom, coal inlet on the conic tube (6), the bottom nozzle (8) in coal inlet (6) below.

2,, it is characterized in that also having top nozzle (5) in coal inlet (6) top by the described ebullated bed fine coal of claim 1 gas producer.

3,, it is characterized in that on the conic tube (7) that coal inlet (6) is located, also having recovery coal inlet (11) by claim 1 or 2 described ebullated bed fine coal gas producers.

4,, it is characterized in that the radial direction of the medullary ray of said nozzle (5) and nozzle (8) and stove has the drift angle of certain angle by claim 1 or 2 described ebullated bed fine coal gas producers.