CN113493703B

CN113493703B - Preparation device and preparation method for special steel reducing gas

Info

Publication number: CN113493703B
Application number: CN202110616191.4A
Authority: CN
Inventors: 李亚斌
Original assignee: Bicheng Shanghai New Energy Technology Co ltd
Current assignee: Bicheng Shanghai New Energy Technology Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-03-01
Anticipated expiration: 2041-06-02
Also published as: CN113493703A

Abstract

The invention provides a preparation device and a preparation method for special steel reducing gas, wherein the preparation device is improved on the basis of the existing gas generating furnace, a fuel layer is accumulated in an upper ash tray fixedly arranged in a furnace body, a plurality of waist holes are arranged on the upper ash tray, a plurality of discharge holes are arranged in a lower ash tray and correspond to the waist holes one by one, and the lower ash tray is rotatably supported in the furnace body; the driving device drives the second driving shaft to rotate, the second driving shaft drives the lower ash tray to rotate, meanwhile, the diameter-variable blocks on the peripheral side of the second driving shaft trigger the shifting blocks on the second driving shaft to retract, the third spring drives the lower ash tray to rotate in a reverse direction, so that the lower ash tray is driven by the third spring and the second driving shaft to rotate in a reciprocating manner, ash sweeping columns arranged on the lower ash tray continuously sweep ash residues in waist holes of the upper ash tray, the ash residues fall into an ash collecting bin below the lower ash collecting bin, ash removal is convenient, and the blockage of the upper ash tray can be avoided; the ash and slag can be removed simultaneously in the process of adding fuel into the furnace, and the labor intensity of operators is reduced.

Description

Preparation device and preparation method for special steel reducing gas

Technical Field

The invention relates to the field of reducing gas preparation, in particular to a preparation device and a preparation method for special steel reducing gas.

Background

In the production process of steel (especially special steel), the requirement on oxides in iron is extremely strict, and the iron oxide and the ferrous oxide in the iron need to be removed; generally, introducing reducing gases such as carbon monoxide and hydrogen into molten iron to deoxidize the molten iron is an effective operation means, and the generated deoxidized products are carbon dioxide and water without introducing new impurities into the molten iron; for example, patent publication No. CN101684507B discloses a method for improving quality of molten iron by introducing a reducing gas into high-temperature molten iron to reduce ferrous oxide, which is widely used by iron and steel companies.

Aiming at two reducing gases of carbon monoxide and hydrogen, a coal gas producer is usually adopted as preparation equipment in industry, carbon fuel is placed in the furnace, water vapor is blown into the carbon fuel from bottom to top, so that the water and the carbon react to generate the carbon monoxide and the hydrogen in a high-temperature environment, oxygen blown into the air firstly reacts with the carbon to generate carbon dioxide, the carbon dioxide then reacts with the carbon on the upper layer to generate the carbon monoxide, and finally carbon monoxide and hydrogen with reducibility flow out of the upper part of the carbon fuel; the carbon fuel has layering property in the combustion process, and sequentially comprises a hollow layer, a drying layer, a dry distillation layer, a reduction layer, a combustion layer and an ash layer from top to bottom, wherein the temperature of the combustion layer and the reduction layer is 700-1200 ℃, and the temperature of each layer at the upper side and the lower side of the combustion layer is sequentially reduced; meanwhile, in order to reduce the temperature of a non-reaction zone in the furnace, a water jacket is generally designed on the furnace body; the temperature in the cavity at the upper side and the lower side of the fuel layer is greatly different from that of the inner fuel layer, generally, the temperature in the cavity above the fuel layer is about 400-500 ℃, and meanwhile, due to the rising of hot air flow and the blowing of cold air flow, the temperature of the ash layer and the temperature below the ash layer are about 300-450 ℃. When the coal gas producer is used, a large amount of ash and slag can be accumulated on an ash tray at the bottom of a producer body, so that the subsequent blowing-in of water vapor is influenced, and oxygen is not available in the producer and the producer cannot burn to generate high temperature; generally, in order to remove ash, a group of rotatable ash trays is arranged below a furnace body, the ash falling from the bottom of a fuel layer falls on the ash trays, the ash trays rotate, and furnace ash on the ash trays is scraped by a scraper fixedly arranged in the furnace and falls into an ash collecting bin on the peripheral side; the ash discharging structure can only avoid the accumulation of ash in the furnace, but can not automatically remove the ash at the bottom of the fuel layer, and the problems need to be solved.

Disclosure of Invention

The invention aims to overcome the defects of the background art and provide a device and a method for preparing reducing gas, wherein the device and the method can automatically remove ash and slag below a fuel bed.

The embodiment of the invention is realized by the following technical scheme:

the device for preparing the special steel reducing gas comprises a generating furnace, a slag discharging device and a gas supplying device, wherein the generating furnace is divided into an upper cavity and a lower cavity by a fuel layer;

the slag discharging device comprises an upper ash tray and a lower ash tray which are stacked, and the upper ash tray is fixedly arranged on the inner wall of the generating furnace to bear the fuel layer; the upper ash tray is provided with a plurality of waist holes, and the lower ash tray is provided with a plurality of discharge holes communicated with the waist holes in a one-to-one correspondence manner and a plurality of ash sweeping columns inserted into the waist holes in a one-to-one correspondence manner; the lower end part of the lower ash tray is connected with a second driving shaft, the second driving shaft is rotatably arranged in the lower cavity, and the second driving shaft is connected with a power device so as to drive the lower ash tray to rotate;

the lower end part of the lower ash tray is provided with an annular cavity; a shaft sleeve fixedly connected with the lower cavity is sleeved on the second driving shaft, and a connecting block extending into the annular cavity is arranged on the shaft sleeve; the connecting block is connected with the ash discharging disc through at least one group of third springs laid in the annular cavity; the side wall of the second driving shaft is provided with a telescopic shifting block, the inner side wall of the shaft sleeve is provided with a reducing block, the lower end part of the lower ash tray is provided with a connecting column, and the connecting column and the reducing block are respectively arranged in two groups of different planes vertical to the second driving shaft; the shifting block is abutted against the diameter-changing block and the connecting column so as to drive the shifting block and the lower ash disc to rotate through the rotation of the second driving shaft; when the shifting block is extruded and contracted to the shortest length due to the diameter-variable block, the shifting block is separated from the connecting column, so that the lower ash tray is reset under the elastic force of the third spring; the continuous rotation of the second driving shaft drives the lower ash tray to reciprocate so as to discharge ash at the lower part of the fuel bed.

Preferably, the device also comprises a paddle used for paving the fuel bed, and the paddle is connected with the power device through a first driving shaft vertically arranged in the upper cavity; the second driving shaft is connected with the second transmission shaft through a bevel gear reversing mechanism, the first driving shaft is connected with the first transmission shaft through the bevel gear reversing mechanism, the first transmission shaft and the second transmission shaft are rotatably arranged on the side wall of the producer furnace in a penetrating mode, and the first transmission shaft and the second transmission shaft are connected through a belt wheel transmission mechanism in a transmission mode.

Preferably, the system also comprises a closed hopper arranged above the producer, wherein an openable feeding hole is arranged on the hopper; the lower part of the hopper is communicated with a crushing bin, the crushing bin is communicated with the top of the furnace, a crushing hammer is arranged in the crushing bin, and the crushing hammer is arranged on the first driving shaft.

Preferably, the sieve plate is arranged above the blades and provided with a plurality of material leaking holes; the sieve tray is supported on the first driving shaft in a manner of shaking up and down through a second spring sleeved on the first driving shaft; the inner top of the producer is provided with a vibration generating ring, the lower end part of the vibration generating ring is provided with a plurality of downward convex wave crest parts and a plurality of upward concave wave trough parts, the wave crest parts and the wave trough parts are alternately arranged, and the adjacent wave crest parts and the wave trough parts are smoothly connected; the sieve tray is evenly provided with a plurality of stand columns at intervals around the first driving shaft to abut against the lower end part of the vibration generation ring so as to drive the sieve tray to vibrate up and down through the rotation of the sieve tray.

Preferably, a rack is arranged on the outer wall of the generator, and the power device and the hopper are both arranged on the rack.

Preferably, the air supply device comprises a steam cavity arranged in the lower cavity body, the steam cavity surrounds the second driving shaft, a plurality of air holes for discharging water vapor are formed in the steam cavity, and the shaft sleeve is fixedly supported on the steam cavity.

Preferably, the lower end of the steam cavity is communicated with a plurality of air guide pipes, and the air guide pipes are connected with a steam source outside the generator through a group of main pipelines; the second transmission shaft penetrates through gaps of the plurality of air guide tubes to be connected with the second driving shaft.

The preparation method for the special steel reducing gas adopts the preparation device, and comprises a gas making step S1 and a slag and material laying step S2; the slag discharging and material spreading step comprises the following steps:

s2.1, paving: the driving device drives the first driving shaft to rotate, and the first driving shaft drives the blades to rotate so as to flatten the fuel added on the fuel bed;

s2.2, deslagging: when the materials are paved, the first driving shaft is connected with the second driving shaft through two groups of bevel gear reversing mechanisms and belt wheel transmission mechanisms; the second driving shaft stirs the connecting column through the telescopic shifting block to drive the lower ash tray to rotate, and ash sweeping columns on the ash tray sweep ash on the upper ash tray; the shifting block contacts the reducing block to contract, so that the connecting column is separated from the shifting block, the lower ash tray is reset under the driving of the third spring, the ash sweeping column sweeps ash in the reverse direction, the reciprocating rotation of the lower ash tray is driven through the rotation of the second driving shaft, and the ash is discharged.

Preferably, the method further comprises a ventilation step S1.2 of switching the water vapor source to a dry air source by the air supply device after the gas making step S1 and before the slag discharging and material paving step S2 so as to reduce the generation of the reducing gas.

Preferably, the slag discharging and material paving step S2 further includes a blanking step: s2.3, the fuel that is sent into through the feed inlet falls into the sieve tray of below after the quartering hammer of first drive shaft driven, and first drive shaft drives the rotation of sieve tray, and the wave peak portion and the trough portion that the top vibrations took place the ring are drawn in proper order to a plurality of stands that encircle first drive shaft evenly set up on the sieve tray for the second spring of sieve tray below compresses successively and recovers, drives the vibrations of sieve tray, and kibbling fuel disperses on the fuel layer of below evenly behind the hourglass material hole.

The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:

the invention relates to a device for preparing reducing gas for special steel, which is improved on the basis of the existing gas generator, wherein a fuel layer is accumulated in an upper ash tray fixedly arranged in a furnace body, a plurality of waist holes are arranged on the upper ash tray, a plurality of discharge holes are arranged in a lower ash tray and are in one-to-one correspondence with the waist holes, the lower ash tray is rotatably supported in the furnace body, a driving device drives a second driving shaft to rotate, the second driving shaft drives the lower ash tray to rotate, meanwhile, a diameter-changing block triggers a shifting block on the second driving shaft to retract, so that the lower ash tray is driven by a third spring and the second driving shaft to rotate in a reciprocating manner, and ash sweeping columns arranged on the lower ash tray continuously sweep ash in the waist holes of the upper ash tray so as to enable the ash to fall into an ash collecting bin below; the ash removal is convenient, and the blockage of the ash feeding disc can be avoided; the method for preparing the reducing gas can simultaneously realize the removal of ash and slag in the process of adding fuel into the furnace and reduce the labor intensity of operators.

Drawings

FIG. 1 is a schematic view showing the construction of a reducing gas producing apparatus according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is a schematic view of the structure of the ash pan of the present invention;

FIG. 5 is a schematic view of the structure of the lower gray plate of the present invention;

FIG. 6 is a schematic view of the inner structure of the bottom ash tray of the present invention;

FIG. 7 is a schematic diagram of the transmission between the lower plate and the second shaft in a bottom view;

FIG. 8 is a schematic view of the lower gray disc of the present invention in section in transmission with a second drive shaft;

10-producer, 100-hopper, 100 a-top cover, 100 b-feed inlet, 100 c-sealing cover, 110-crushing bin, 110 a-crushing hammer, 120-vibration generating ring, 120 a-crest part, 120 b-trough part, 130-reducing gas outlet, 140-dust collecting bin, 20-first driving shaft, 200-power device, 200 a-gearbox, 21-first driving shaft, 210-belt wheel transmission mechanism, 22-second driving shaft, 23 a-chassis, 23 b-shifting block, 23 c-first spring, 24-shaft sleeve, 24 a-connecting block, 24 b-reducing block, 30-sieve tray, 30 a-material leakage hole, 30 b-second spring and 30 c-upright column, 40-paddle, 50-fuel layer, 60-ash tray, 60 a-cone part, 60 b-waist hole, 70-ash tray, 70 a-discharge hole, 70 b-ash-sweeping column, 70 c-annular cavity, 70 d-third spring, 70 e-connecting column, 70 f-key block, 80-steam cavity, 80 a-air duct, 80 b-blocking cap, 90-air feeder, 90 a-main duct.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Referring to fig. 1 to 7, the present invention provides a reducing gas preparation apparatus and a reducing gas preparation method for use in a special steel production process; the reducing gas refers to carbon monoxide and hydrogen, the preparation device is improved on the existing gas producer, the preparation principle is that water vapor containing water and oxygen reacts with carbon at high temperature to generate carbon monoxide and hydrogen, and the principle is the prior art and is not described again.

The first embodiment is as follows:

referring to fig. 1, the preparation device of the present invention includes a producer 10 and a frame disposed on the producer 10, a power device 200 is disposed on the top of the frame, the power device 200 includes a motor, a transmission shaft, a gearbox 200a, and the like, and finally the output rotation speed of the power device 200 meets the design requirement of the present scheme.

The generating furnace 10 is divided into an upper cavity and a lower cavity by a fuel layer 50 in the furnace body, an air supply device 90 for blowing water vapor to the fuel layer 50 is communicated in the lower cavity, a reducing gas outlet 130 is arranged on the side wall of the upper cavity, and a slag discharge device is arranged below the fuel layer 50.

Referring to fig. 1, the slag discharging device includes an upper tray 60 and a lower tray 70 which are overlapped with each other, the upper tray 60 and the lower tray 70 have the same diameter and size, and the upper tray 60 is fixedly installed on the inner wall of the producer 10 to support the fuel bed 50.

Referring to the upper tray 60 of fig. 4 and the lower tray 70 of fig. 5, a plurality of waist holes 60b are formed in the upper tray 60, a plurality of discharge holes 70a communicated with the plurality of waist holes 60b in a one-to-one correspondence manner and a plurality of ash-sweeping columns 70b inserted into the plurality of waist holes 60b in a one-to-one correspondence manner are formed in the lower tray 70; the discharge holes 70a may be circular holes, square holes or other hole patterns, and in this embodiment, the hole patterns are selected to be identical to the waist holes 60 b.

The lower end of the lower ash tray 70 is connected with a second driving shaft 23, the second driving shaft 23 is rotatably arranged in the lower cavity, specifically, in this embodiment, the bottom of the lower cavity is provided with a chassis 23a, and the second driving shaft 23 is rotatably arranged on the chassis 23 a; the second driving shaft 23 is connected to the power unit 200 to rotate the lower ash tray 70.

It should be noted that, since the lower end of the lower ash tray 70 is connected with the second driving shaft 23, the middle of the lower ash tray 70 cannot be provided with the slag discharge port 70a, and accordingly, the middle of the upper ash tray 60 has no meaning of designing the waist hole 60b, so that in order to discharge the ash slag at the middle of the upper end of the upper ash tray 60, the middle of the upper ash tray 60 is provided with the cone portion 60a, the plurality of waist holes 60b are arranged around the cone portion 60a, and during slag discharge, the cone portion 60a can enable the ash slag at the lower layer of the fuel layer 50 to move towards the circumferential side along the surface of the cone portion 60a and then enter the waist hole 60b at the circumferential side.

Referring to fig. 6 and 7, an annular cavity 70c is formed in the lower end of the lower ash tray 70, a shaft sleeve 24 fixedly connected with the lower cavity is sleeved on the second driving shaft 23, a connecting block 24a extending into the annular cavity 70c is arranged at the upper end of the shaft sleeve 24, and the connecting block 24a is connected with the lower ash tray 70 through at least one set of third springs 70d laid in the annular cavity 70 c; specifically, a key block 70f is protrudingly provided at the lower end portion of the lower dust pan 70 in the annular cavity 70c, and one end of a third spring 70d is connected to the key block 70f, and the other end is connected to the connecting block 24 a.

Because the shaft sleeve 24 is fixedly arranged in the lower cavity, the connecting block 24a can slide in the annular cavity 70c, and the lower ash disc 70 can be regarded as being rotatably arranged on the shaft sleeve 24, so that the design of the third spring 70d can be regarded as: after the lower ash tray 70 is rotated in the positive direction of the acting force of the third spring 70d, the reverse elastic force of the third spring 70d can urge the lower ash tray 70 to rotate reversely and reset (the positive direction refers to clockwise or counterclockwise); it should be noted that the elastic force of the third spring 70d may be a compressed elastic force or a contracted and restored elastic force after being stretched.

Referring to fig. 7 and 8, a retractable shifting block 23b is arranged on the side wall of the second driving shaft 23, that is, the shifting block 23b is telescopically mounted on the side wall of the second driving shaft 23 through a spring, and the shifting block 23b can be retracted along the radial direction of the second driving shaft 23; in addition, a diameter-changing block 24b is arranged on the inner side wall of the shaft sleeve 24; the lower end of the lower ash tray 70 is further provided with a connecting column 70e located in a circle surrounded by the annular cavity 70c, the connecting column 70e and the diameter-changing blocks 24b are respectively located in two groups of different planes perpendicular to the second driving shaft 23, that is, in a direction perpendicular to the view of fig. 7, the connecting column 70e and the diameter-changing blocks 24b are located in mutually noninterfering height planes.

For illustration: referring to fig. 7, the shifting block 23b abuts against the diameter-changing block 24b and the connecting column 70e, and at this time, the second driving shaft 23 rotates counterclockwise to drive the shifting block 23b and the lower dust pan 70 to rotate counterclockwise; in the process, the reducing block 24b contacts the shifting block 23b, so that the rotating radius of the shifting block 23b is gradually reduced, when the shifting block 23b is extruded and contracted to the shortest extent due to the reducing block 24b, the shifting block 23b is separated from the connecting column 70e, the lower ash tray 70 is reset under the elastic force of the third spring 70d, and the lower ash tray 70 swings clockwise to the initial position.

In practice, according to the required elastic force, the third springs 70d may be provided in multiple sets, referring to fig. 6, in this embodiment, two sets.

The continuous rotation of the second driving shaft 23 drives the lower ash tray 70 to swing in a reciprocating manner, the ash sweeping column 70b continuously stirs the ash in the waist hole 60b in a reciprocating manner, and ash leaks out along the discharge hole 70c and falls into the ash collecting bin 140 below.

Further, referring to fig. 1 and 2, in some preferred embodiments, the preparation apparatus further includes a paddle 40 for flattening the fuel bed 50, the paddle 40 being connected to an output end of a transmission case 200a of the power unit 200 through a first driving shaft 20 vertically provided in the upper cavity; the second driving shaft 23 is connected with a second transmission shaft 22 through a bevel gear reversing mechanism, the first driving shaft 20 is connected with a first transmission shaft 21 through the bevel gear reversing mechanism, the first transmission shaft 21 and the second transmission shaft 22 are rotatably arranged on the side wall of the producer 10 in a penetrating way, and the first transmission shaft 21 and the second transmission shaft 22 are connected through a belt wheel transmission mechanism 210 in a transmission way; for new fuel to be fed into the producer 10, the paddles 40 can evenly lay it flat on the fuel bed 50, avoiding the accumulation on the fuel bed 50, which can cause the thickness of the fuel bed 50 to be inconsistent throughout.

In addition, in some preferred embodiments, the system further comprises a closed hopper 100 arranged above the producer 10, the hopper 100 is arranged on the frame, the upper end of the hopper 100 is provided with an openable and closable feeding hole 100b, and the feeding hole 100b is provided with a sealing cover 100c so as to be opened; the lower part of the hopper 100 is communicated with a crushing bin 110, the crushing bin 110 is communicated with the top of the producer 10, a crushing hammer 110a is arranged in the crushing bin 110, the crushing hammer 110a adopts the design of the prior art, and the crushing hammer 110a is arranged on the first driving shaft 20; the fuel is pulverized into particles with uniform size by a conveyer belt or manually feeding the fuel into the feed inlet 100b and the breaking hammer 110, and in actual production, the required particle size is about 20mm in diameter, and the air permeability after the fuel layer 50 is formed by stacking is reasonable.

In addition, in some preferred implementations, considering that the fuel particles after actual pulverization are excessively pulverized to generate smaller particles, the small particles are prevented from being piled on the fuel layer 500, a sieve tray 30 is further arranged above the paddles 40, a plurality of material leaking holes 30a are formed in the sieve tray 30, the excessively pulverized particles including about 20mm and below can be mixed and uniformly sprinkled below through the vibration of the sieve tray 30, and the vibration is realized by the following structure:

the sieve tray 30 is supported on the first driving shaft 20 to be capable of shaking up and down by a second spring 30b sleeved on the first driving shaft 20; a vibration generating ring 120 is arranged at the inner top of the generator 10, a plurality of downward convex wave crest portions 120a and a plurality of upward concave wave trough portions 120b are arranged at the lower end of the vibration generating ring 120, the plurality of wave crest portions 120a and the plurality of wave trough portions 120b are alternately arranged, and the adjacent wave crest portions 120a and the adjacent wave trough portions 120b are smoothly connected; a plurality of vertical posts 30c are uniformly spaced around the first driving shaft 20 on the sieve tray 30 to abut against the lower end of the vibration generation ring 120, so that the sieve tray 30 is driven to vibrate up and down by the rotation of the sieve tray 30.

In addition, referring to fig. 1 and 3, in the present invention, the air supply device 90 includes a steam chamber 80 disposed in the lower chamber, an air hole for discharging steam is disposed at an upper end portion of the steam chamber 80, the steam chamber 80 is disposed around the shaft sleeve 24 outside the second driving shaft 23, and a shielding cap 80b is further disposed on the shaft sleeve 24, and the shielding cap 80b mainly shields ash from falling into the steam chamber 80.

The shaft sleeve 24 is fixedly supported on the steam cavity 80, the lower end of the steam cavity 80 is communicated with a plurality of air ducts 80a, the air ducts 80a are connected with a steam source outside the generator 10 through a group of main pipelines, and the air ducts 80a are used for supporting the steam cavity 80 while steam is blown into the steam cavity 80; a plurality of air ducts 80a below connect blower unit through a set of trunk line 90a that extends to outside the stove body, with the reason that switches on through a plurality of air ducts 80a dispersion between steam chamber 80 and trunk line 90 a: the second transmission shaft 22 is inserted into the gaps between the plurality of air ducts 80a to be connected with the second driving shaft 23.

Furthermore, to avoid the high temperature of the fuel bed 50 from having a high temperature impact on the third spring 70d in the lower end of the lower ash tray 70, resulting in high temperature failure of the third spring 70d, first, optionally: the first spring 23c, the third spring 70d and the third spring 70d can all adopt industrial high-temperature-resistant springs, such as high-temperature-resistant springs produced by Yongjia III and spring Limited company, and can resist the high temperature of 500-650 ℃; alternatively, a set of ceramic platforms may extend from the lower end of the lower ash tray 70, the heat conduction efficiency of which is lower than that of the lower ash tray 70 itself, and an annular chamber 70c is formed in the ceramic platforms, and the temperature of which is about 100 to 200 ℃, so as to satisfy the tolerance condition of a common spring.

Example two:

the method for preparing the special steel reducing gas is provided, and the preparation device comprises a gas making step S1 and a slag and material discharging and paving step S2.

The gas making step S1 is a prior art, i.e. the blown-in steam reacts with the fuel bed 50 at high temperature, and the generated reducing gas is discharged to the post-treatment equipment through the outlet of the reducing gas 130.

The slag discharging and material spreading step S2 includes:

s2.1, paving: the driving device drives the first driving shaft 20 to rotate, and the first driving shaft 20 drives the blades 40 to rotate so as to flatten the fuel added on the fuel layer 50;

s2.2, deslagging: while spreading, the first driving shaft 20 is connected with the second driving shaft 23 through two groups of bevel gear reversing mechanisms and belt wheel transmission mechanisms 210; the second driving shaft 23 drives the connecting column 70e through the telescopic shifting block 23b to drive the lower ash tray 70 to rotate, and the ash sweeping column 70b on the ash tray sweeps ash on the upper ash tray 60; the shifting block 23b contacts the variable diameter block 24b to contract, so that the connecting column 70e is separated from the shifting block 23b, the lower ash tray 70 is reset under the driving of the third spring 70d, and the ash sweeping column 70b sweeps ash in the reverse direction to drive the reciprocating rotation of the lower ash tray 70 through the rotation of the second driving shaft 23, so that the ash is discharged.

S2.3, the fuel fed through the feed inlet 100b falls into the sieve tray 30 below after being crushed by the crushing hammer 110a driven by the first driving shaft 20, the first driving shaft 20 drives the sieve tray 30 to rotate, a plurality of upright columns 30c uniformly arranged on the sieve tray 30 around the first driving shaft 20 sequentially pass through the wave crest part 120a and the wave trough part 120b of the upper vibration generation ring 120, so that the second springs 30b below the sieve tray 30 are compressed and restored sequentially to drive the sieve tray 30 to vibrate, and the crushed fuel is uniformly dispersed on the fuel layer 50 below after passing through the material leakage holes 30 a.

The steps S2.1, S2.2 and S2.3 are performed simultaneously.

In some preferred embodiments, it is contemplated that the feed into the feed inlet 100b may take the form of manual feed or conveyor feed; when the manual feeding is selected, the method also comprises a ventilation step S1.2 of switching a water vapor source to a dry air source by the air supply device 90 and closing the reducing gas outlet 130 after the gas making step S1 and before the slag discharging and material paving step S2; namely, before manual feeding, dry air is introduced, and moisture is not contained, at the moment, under the condition that fuel in the fuel layer 50 is not supplemented, oxygen in the air reacts with carbon to generate carbon dioxide, generated reducing gas is extremely little, under the condition of keeping environmental ventilation, and when manual overhead operation is carried out, the concentration of the reducing gas in the air is in a controllable range, and discomfort of operators is avoided.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation facilities for special steel reducing gas, including in the stove be separated by fuel blanket (50) for go up cavity and lower cavity generating furnace (10), lower cavity intercommunication to fuel blanket (50) the air supply device (90) of drum into vapor, be equipped with reducing gas outlet (130) on the last cavity, characterized by: also comprises a slag discharging device arranged below the fuel layer (50);

the slag discharging device comprises an upper ash tray (60) and a lower ash tray (70) which are stacked, wherein the upper ash tray (60) is fixedly arranged on the inner wall of the producer (10) to bear the fuel layer (50); a plurality of waist holes (60b) are arranged on the upper ash tray (60), a plurality of discharge holes (70a) which are communicated with the waist holes (60b) in a one-to-one correspondence manner and a plurality of ash sweeping columns (70b) which are inserted into the waist holes (60b) in a one-to-one correspondence manner are arranged on the lower ash tray (70); the lower end part of the lower ash tray (70) is connected with a second driving shaft (23), the second driving shaft (23) is rotatably arranged in the lower cavity, and the second driving shaft (23) is connected with a power device (200) to drive the lower ash tray (70) to rotate;

the lower end part of the lower ash tray (70) is provided with an annular cavity (70 c); a shaft sleeve (24) fixedly connected with the lower cavity is sleeved on the second driving shaft (23), and a connecting block (24a) extending into the annular cavity (70c) is arranged on the shaft sleeve (24); the connecting block (24a) is connected with the lower ash tray (70) through at least one group of third springs (70d) laid in the annular cavity (70 c); the side wall of the second driving shaft (23) is provided with a telescopic shifting block (23b), the inner side wall of the shaft sleeve (24) is provided with a reducing block (24b), the lower end part of the lower ash tray (70) is provided with a connecting column (70e), and the connecting column (70e) and the reducing block (24b) are respectively arranged in two groups of different planes vertical to the second driving shaft (23); the shifting block (23b) is abutted against the diameter-changing block (24b) and the connecting column (70e) so as to drive the shifting block (23b) and the lower ash tray (70) to rotate through the rotation of the second driving shaft (23); when the shifting block (23b) is extruded and contracted to the shortest extent by the variable diameter block (24b), the shifting block (23b) is separated from the connecting column (70e), so that the lower ash tray (70) is reset under the elastic force of the third spring (70 d); the continuous rotation of the second driving shaft (23) drives the lower ash tray (70) to reciprocate so as to discharge ash at the lower part of the fuel layer (50);

the device also comprises a paddle (40) used for paving the fuel layer (50), wherein the paddle (40) is connected with the power device (200) through a first driving shaft (20) vertically arranged in the upper cavity;

the second driving shaft (23) is connected with the second transmission shaft (22) through a bevel gear reversing mechanism, the first driving shaft (20) is connected with the first transmission shaft (21) through the bevel gear reversing mechanism, the first transmission shaft (21) and the second transmission shaft (22) are rotatably arranged on the side wall of the producer (10) in a penetrating mode, and the first transmission shaft (21) is connected with the second transmission shaft (22) through a belt wheel transmission mechanism (210) in a transmission mode;

the device also comprises a closed hopper (100) arranged above the producer (10), wherein the hopper (100) is provided with a feed inlet (100b) which can be opened and closed;

the lower part of the hopper (100) is communicated with a crushing bin (110), the crushing bin (110) is communicated with the top of the producer (10), a crushing hammer (110a) is arranged in the crushing bin (110), and the crushing hammer (110a) is arranged on the first driving shaft (20);

the sieve tray (30) is arranged above the blades (40), and a plurality of material leaking holes (30a) are formed in the sieve tray (30); the sieve tray (30) is supported on the first driving shaft (20) in a way that the sieve tray can shake up and down through a second spring (30b) sleeved on the first driving shaft (20);

the inner top of the producer (10) is provided with a vibration generating ring (120), the lower end of the vibration generating ring (120) is provided with a plurality of downward convex wave crest parts (120a) and a plurality of upward concave wave trough parts (120b), the wave crest parts (120a) and the wave trough parts (120b) are alternately arranged, and the adjacent wave crest parts (120a) and the wave trough parts (120b) are smoothly connected;

a plurality of upright posts (30c) are uniformly arranged on the sieve tray (30) at intervals around the first driving shaft (20) to abut against the lower end part of the vibration generation ring (120) so as to drive the sieve tray (30) to vibrate up and down through the rotation of the sieve tray (30).

2. The apparatus for producing a special steel reducing gas according to claim 1, wherein: the outer wall of the producer (10) is provided with a rack, and the power device (200) and the hopper (100) are both arranged on the rack.

3. The apparatus for producing a special steel reducing gas according to claim 1, wherein: the air supply device (90) comprises a steam cavity (80) arranged in the lower cavity, the steam cavity (80) surrounds the second driving shaft (23), a plurality of air holes for discharging steam are formed in the steam cavity (80), and the shaft sleeve (24) is fixedly supported on the steam cavity (80).

4. The apparatus for producing a special steel reducing gas according to claim 3, wherein: the lower end of the steam cavity (80) is communicated with a plurality of air ducts (80a), and the air ducts (80a) are connected with a steam source outside the producer (10) through a group of main pipelines;

the second transmission shaft (22) penetrates through gaps of the plurality of air guide pipes (80a) to be connected with the second driving shaft (23).

5. A method for producing a reducing gas for special steel, characterized in that the production apparatus of any one of claims 1 to 4 is used, and comprises a gas production step S1 and a slag and material laying step S2; the slag discharging and material spreading step comprises the following steps:

s2.1, paving: the driving device drives the first driving shaft (20) to rotate, and the first driving shaft (20) drives the blades (40) to rotate so as to flatten the fuel added on the fuel layer (50);

s2.2, deslagging: when the material is paved, the first driving shaft (20) is connected with the second driving shaft (23) through two groups of bevel gear reversing mechanisms and belt wheel transmission mechanisms (210); the second driving shaft (23) drives the connecting column (70e) through the telescopic shifting block (23b) to drive the lower ash tray (70) to rotate, and ash sweeping columns (70b) on the ash tray sweep ash on the upper ash tray (60); the shifting block (23b) is in contact with the reducing block (24b) to contract, so that the connecting column (70e) is separated from the shifting block (23b), the lower ash tray (70) is reset under the driving of the third spring (70d), and the ash sweeping column (70b) sweeps ash in a reverse direction, so that the rotation of the second driving shaft (23) drives the reciprocating rotation of the lower ash tray (70) to discharge the ash.

6. The method for preparing special steel reducing gas according to claim 5, which is characterized in that: also comprises an air exchange step which is arranged after the gas making step S1 and before the slag discharging and material paving step S2:

s1.2, the air supply device (90) switches a water vapor source to be a dry air source so as to reduce the generation of reducing gas.

7. The method for preparing special steel reducing gas according to claim 5 or 6, characterized in that: the slag discharging and material paving step S2 further comprises a blanking step:

s2.3, the fuel fed through the feed inlet (100b) falls into a lower sieve tray (30) after being crushed by a crushing hammer (110a) driven by a first driving shaft (20), the first driving shaft (20) drives the sieve tray (30) to rotate, a plurality of upright columns (30c) uniformly arranged on the sieve tray (30) around the first driving shaft (20) sequentially pass through a crest portion (120a) and a trough portion (120b) of an upper vibration generation ring (120), so that a second spring (30b) below the sieve tray (30) is compressed and restored sequentially to drive the sieve tray (30) to vibrate, and the crushed fuel is uniformly dispersed on a fuel layer (50) below after passing through a material leakage hole (30 a).