CN113773866A

CN113773866A - Air inlet closed-circuit system of dry quenching furnace

Info

Publication number: CN113773866A
Application number: CN202010516909.8A
Authority: CN
Inventors: 陈秀林; 何小楷; 李梦年; 刘元杰; 孙迎辉; 周宾; 陈皓瑞; 张茂志
Original assignee: RUIAN FIRST VALVE FACTORY
Current assignee: RUIAN FIRST VALVE FACTORY
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-12-10

Abstract

The invention provides an air inlet closed-circuit system of a dry quenching furnace, wherein a furnace body is divided into a pre-storage section and a cooling section from top to bottom, an upper annular air channel is formed in the position of the furnace body corresponding to the pre-storage section and the cooling section, a coke discharge system and a circulating air inlet system are arranged at the bottom of the dry quenching furnace, an upper air chamber and a lower air chamber of the circulating air inlet system are communicated with the furnace body, a flap valve is arranged at the outlet of a circulating fan, the flap valve is respectively connected with the upper air chamber and the lower air chamber through an upper air chamber connecting pipe and a lower air chamber connecting pipe, and circulating air flow in the furnace body enters the cooling section through the upper air chamber and the lower air chamber and flows back to the circulating fan through the upper annular air channel, a primary dust removal unit and a boiler; the coke discharging system is provided with a flat gate, and the circulating air inlet system is provided with a circulating air cut-off valve between a circulating fan and a flap valve; a discharge cut-off valve is arranged below the flat gate. The dry quenching furnace is provided with an air inlet closed-circuit system to form a sealed air path circulating system, so that the coke powder can be effectively prevented from leaking, and meanwhile, the high-heat coke powder is prevented from leaking and burning workers, and the safety is high.

Description

Air inlet closed-circuit system of dry quenching furnace

Technical Field

The invention relates to the technical field of coking dry quenching production technology and equipment manufacturing, in particular to a closed system for air intake in a dry quenching furnace together with a dry quenching furnace circulating air intake system and a coke discharge system.

Background

The coke tank filled with 1000 ℃ red coke enters a dry quenching furnace through a hoist, the coke flows downwards in a cooling section of the dry quenching furnace, inert circulating gas is sent into an upper air chamber, a lower air chamber and a central air duct in a cross air cap through a circulating fan, the inert gas flows upwards and flows downwards on the coke, the coke is cooled through heat exchange with the circulating gas, the coke discharged from the dry quenching furnace can be cooled to be below 200 ℃, the inert circulating gas performs countercurrent heat exchange with the coke in the cooling section of the dry quenching furnace, and the coke enters a dry quenching boiler after being heated to 900-960 ℃. As a small amount of air leaks into the negative pressure section of the gas circulation system, O2 passes through the red coke layer and reacts with the coke to generate CO2, CO2 is reduced into CO in the high-temperature area of the coke layer, and the concentration of CO in the circulating gas is higher and higher along with the increase of the circulation times. In addition, residual volatile matters in the coke are always precipitated, H2, CO, CH4 and the like generated by pyrolysis of the coke are all inflammable and explosive components, and therefore, the concentration of the inflammable components in the circulating gas is controlled to be below the explosion limit in the dry quenching operation. Generally, two measures can be taken for control, one is that a proper amount of industrial N2 is continuously supplemented into a gas circulation system, combustible components in the circulating gas are diluted, and then the corresponding amount of circulating gas is dispersed; secondly, a proper amount of air is continuously introduced into the circulating gas led out when the temperature is increased to 900-960 ℃ to burn the growing combustible components, and the circulating gas with a corresponding amount is discharged after the circulating gas is cooled by a boiler. Both methods can be feedback regulated by the concentration of H2, CO in the cycle gas as measured by an automatic on-line gas analyzer installed on the cycle gas pipeline.

As shown in fig. 1 to 5, currently, all dry quenching furnace circulating gas directly enters a flap valve through a circulating fan, two groups of adjusting flaps are arranged in the flap valve and respectively enter an upper air chamber and a lower air chamber of a blast device, the upper air chamber enters a dry quenching furnace through a seam between double-layer conical buckets, one path of the upper air chamber enters the lower air chamber and enters a central air chamber, a discharge port dry quenching furnace outlet is arranged below the blast device, and a coke discharge system comprises a flat gate, a transition chute, a vibrating feeder, a rotary sealing valve, a double-fork chute and a belt which are arranged at the dry quenching furnace outlet;

the flap valve is used for adjusting air volume at ordinary times and can not be used for cutting off, the flat gate only cuts off coke at the outlet of the dry quenching furnace, the coke discharging system is directly connected with the outside, the coke discharging purpose is prevented when the coke discharging needs to be stopped, and the flat gate cuts off coke particles, so the gate can not cut off air effect.

Equipment damages need not the stove maintenance in the dry quenching system, like boiler explosion etc. need to stop on-line repair one day or several days after the circulating fan, only need stifled stove maintenance, can only close the flap valve behind the circulating fan and the flat gate of dry quenching grate exit at present, because the flap valve and flat gate close the back leak out very seriously, one: air enters the upper air chamber and the lower air chamber into the dry quenching furnace through the circulating fan, and secondly: the air directly gets into the dry quenching stove from the blast air device with the air from the flat gate through coke discharge system in, will lead to the coke in the dry quenching stove to reburn again for a long time, seriously then burns out the cross hood and collapses and cross passageway burns out, makes whole dry quenching stove unable use must shut down the stove and overhaul.

In addition, when the rotary sealing valve of the coke discharging system of the dry quenching furnace is blocked, emergency repair is needed, and at the moment, the online emergency repair is only carried out after the air volume and the air pressure of the fan are reduced, because the flat gate cannot be closed and cut off, the overhaul personnel are very dangerous during operation (the biggest 2-person death accident happens when domestic iron and steel enterprises overhaul the density), the discharge cut-off valve in the coke discharging system is closed, the inert gas in the dry quenching furnace is prevented from being discharged downwards, and the purpose of safe overhaul is started.

Aiming at the defects of the prior art, the closed-circuit system of the air inlet system and the coke discharge system of the dry quenching furnace is improved, the operation safety and reliability during maintenance are improved, and the equipment safety and reliability during major safety accidents and maintenance are prevented.

Disclosure of Invention

In view of the above, the present invention provides an air intake closed-circuit system of a dry quenching furnace:

an air inlet closed loop system of a dry quenching furnace comprises a primary dust removal unit and a boiler, wherein the boiler body is communicated with the boiler body, the boiler body is divided into a pre-storage section and a cooling section from top to bottom, an upper annular air channel is formed in the position, between the pre-storage section and the cooling section, of the boiler body, a coke discharge system and a circulating air inlet system are arranged at the bottom of the dry quenching furnace, the circulating air inlet system comprises a circulating fan, an upper air chamber connecting pipe, a lower air chamber connecting pipe, an upper air chamber and a lower air chamber, the upper air chamber and the lower air chamber are communicated with the boiler body, a flap valve is arranged at the outlet of the circulating fan, the flap valve is respectively connected with the upper air chamber and the lower air chamber through the upper air chamber connecting pipe and the lower air chamber connecting pipe, and circulating air flow in the boiler body enters the cooling section through the upper annular air channel and flows back to the circulating fan through the primary dust removal unit and the boiler; the coke discharging system is provided with a flat gate, and the circulating air inlet system is provided with a circulating air stop valve at an outlet between the circulating fan and the flap valve; and a discharge cut-off valve is arranged below the flat gate.

Preferably, the circulating air stop valve is arranged between the circulating fan and the flap valve and is a totally-enclosed type flap valve.

The preferred, the discharge trip valve includes chute body, blind flange, maintenance blind plate, the chute body include chute, guide slot, lower chute, the guide slot is connected at last chute under and between the chute, establish the water conservancy diversion frame in the guide slot or the maintenance blind plate, the guide slot both sides are equipped with the guide slot flange, and shown guide slot flange outside is equipped with blind flange.

Preferably, the maintenance blind plate is provided with a sealing groove, a sealing strip is arranged in the sealing groove, the guide groove is provided with a sealing surface, and the sealing strip is connected with the maintenance blind plate and the sealing surface in a sealing manner.

Preferably, a locking bolt is installed on the guide groove, the locking bolt presses the maintenance blind plate to enable the sealing strip to be in close contact with the sealing surface, and the maintenance blind plate cuts off a channel between the upper chute and the lower chute.

Preferably, the coke discharging system is further provided with a vibrating feeder, a rotary sealing valve, a chute and a coke conveying belt, and the discharging cut-off valve is installed at a position between the lower part of the flat plate gate and the upper part of the vibrating feeder.

Preferably, a channel is arranged in the flow guide frame and is communicated with the upper chute and the lower chute.

Preferably, the upper taper of the lower chute is larger than the lower taper of the upper chute.

The invention has the beneficial effects that: the dry quenching furnace is provided with an air inlet closed-circuit system to form a sealed air path circulating system, so that coke powder can be effectively prevented from leaking, meanwhile, the closed-circuit system can be formed during maintenance, workers with high heat can be prevented from leaking and burning the coke powder, and the safety is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a prior art circulating air intake system and coke discharge system of a dry quenching furnace;

FIG. 2 is a schematic diagram of a coke discharge system of a prior art dry quenching furnace;

FIG. 3 is a schematic view of the arrangement of the flat gate, chute and shaker feeder in the coke discharge system of a prior art dry quenching furnace with the discharge of coke stopped;

FIG. 4 is a schematic illustration of the arrangement of the flat gate, chute and shaker feeder in the coke discharge system of the prior art dry quenching furnace during normal coke discharge in the discharge system;

FIG. 5 is a three-dimensional schematic illustration of a flat gate and chute in a coke discharge system of a prior art dry quench furnace;

FIG. 6 is a schematic view of the air intake closed-circuit system of the dry quenching furnace of the present invention;

FIG. 7 is a schematic layout diagram of a flat plate gate, a discharge cut-off valve and a vibrating feeder in a discharge system when coke discharge is stopped in an air inlet closed-circuit system of a dry quenching furnace according to the invention;

FIG. 8 is a schematic layout diagram of a flat plate gate, a discharge cut-off valve and a vibrating feeder in a discharge system during normal coke discharge in the air inlet closed-circuit system of the dry quenching furnace of the invention;

FIG. 9 is a three-dimensional schematic view of the plate gate and the discharge cutoff valve in the air intake closed-loop system of the dry quenching furnace according to the present invention;

FIG. 10 is a three-dimensional schematic view of the plate gate and the exhaust cut-off valve in the inlet air closed-circuit system of the dry quenching furnace according to the present invention when they are opened;

FIG. 11 is a side view of the discharge shutoff valve open;

FIG. 12 is a cross-sectional view A-A of the discharge shutoff valve of FIG. 11;

fig. 13 is a sectional view a-a of fig. 11 with the discharge cut-off valve open;

fig. 14 is a three-dimensional view of the circulating air cut-off valve.

Description of reference numerals:

1. a circulating air outlet pipe, 2, a circulating air stop valve, 3, a flap valve, 4, an upper air chamber connecting pipe, 5, a lower air chamber connecting pipe, 6, a circulating air inlet system, 7, a coke discharging system, 8, a flat gate, 9, a discharging stop valve, 10, a vibrating feeder, 11, a rotary sealing valve, 12, a double-fork chute, 13, a coke conveying belt, 14, a transition chute, 15, a dry quenching furnace outlet, 16, a cross beam, 17, a lower air chamber, 18, a lower cone hopper, 19, an upper air chamber, 20, a lower annular air duct, 21, an upper cone hopper, 22, a blast cap, 23, a cooling section, 24, an upper annular air duct, 25, a prestoring chamber, 26, a dry quenching furnace port, 27, red coke, 28, primary dedusting, 29, a boiler, 30, a connecting pipe, 31, a circulating fan, 901, a chute body, 902, a blind flange, 903, an upper chute, 904, a guide groove, 905, a lower chute, 906 and a locking bolt, 907. the inspection blind plate comprises an inspection blind plate 908, a sealing groove 909, a sealing strip 910, a sealing surface 911, a flow guide frame 912, an inner channel 913, a guide groove flange 914, a lower cone opening 915 and an upper cone opening

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention will be further described with reference to the accompanying drawings.

The invention provides the following technical scheme:

as shown in fig. 6-14, which is a preferred embodiment of the air inlet closed-loop system of the dry quenching furnace of the present invention, the air inlet closed-loop system of the dry quenching furnace comprises a primary dust removal unit 28, a boiler 30, a circulating air inlet system 6, and a coke discharge system 7, wherein the furnace body is divided into a pre-storage section 25 and a cooling section 23 from top to bottom, the furnace body forms an upper annular air duct 24 at a position corresponding to the pre-storage section 25 and the cooling section 23, the coke discharge system 7 and the circulating air inlet system 6 are disposed at the bottom of the dry quenching furnace, the circulating air inlet system 6 comprises a circulating fan 31, an upper air chamber connecting pipe 4, a lower air chamber connecting pipe 5, an upper air chamber 19 and a lower air chamber 17, the upper air chamber 19 and the lower air chamber 17 are communicated with the furnace body, a flap valve 3 is disposed at an outlet of the circulating fan 31 to adjust air volumes of the upper air chamber 19 and the lower air chamber 17, the flap valve 3 is respectively connected with the upper air chamber 19 and the lower air chamber 17 through the upper air chamber connecting pipe 4 and the lower air chamber connecting pipe 5, circulating airflow in the furnace body enters the cooling section 23 through the upper air chamber 19 and the lower air chamber 17 for heat exchange, and then high-temperature gas flows back to the circulating fan 31 through the upper annular air duct 24 and the primary dust removal unit 28 after heat exchange through the boiler 30; the coke discharging system 7 is provided with a flat gate 8, a vibrating feeder 10, a rotary sealing valve 11 and a double-fork chute 12, and is further characterized in that the coke discharging system is provided with a coke conveying belt 13: in the circulating air inlet system 7, a circulating air cut-off valve 2 is arranged at the outlet of the circulating fan 31; and a discharge cut-off valve 9 is arranged below the flat gate 8.

Specifically, circulating air trip valve 2 sets up between circulating fan 31 and flap valve 3, circulating air trip valve 2 be totally enclosed push-pull valve, also can adopt flap check valve structural style, also can adopt flue push-pull valve structural style, only need when closing tightly can.

As shown in fig. 12 to 14, the discharge cutoff valve 9 includes a chute body 901, a blind flange 902, and an inspection blind plate 907, the chute body 901 includes an upper chute 903, a guide groove 904, and a lower chute 905, the guide groove 904 is connected between the upper chute 903 and the lower chute 905, a guide frame 911 or the inspection blind plate 907 is disposed in the guide groove 904, guide groove flanges 13 are disposed on two sides of the guide groove 904, and the blind flange 902 is disposed outside the guide groove flange 913.

When the maintenance is needed, the blind flange 902 is detached, the maintenance blind plate 907 is inserted into the guide groove 904, and then the blind flange 902 is installed outside the guide groove flange 913; when the maintenance is finished and the maintenance needs to be normal, the blind flange 902 is removed, the maintenance blind plate 907 is taken out, the guide frame 911 is replaced to be inserted into the guide groove 904, and then the blind flange 902 is installed outside the guide groove flange 913; the chute 904 may not have the chute 911 installed, but the purpose of installing the chute 911 is to prevent coke from staying in the chute 904 for the next replacement.

Specifically, as shown in fig. 13 and 14, the access blind 907 is provided with a sealing groove 908, a sealing strip 909 is arranged in the sealing groove 908, the guide groove 904 is provided with a sealing surface 910, and the sealing strip 909 is connected with the access blind 907 and the sealing surface 910 in a sealing manner. The sealing surface 910 is the top inside wall of the finger channel 904 in this embodiment. Specifically, the sealing groove 908 is disposed around the upper portion of the access blind 907. In the drawing of the present embodiment, the sealing groove is formed on the top surface of the access blind 907. Guide channel 904 is fitted with a lock bolt 906, and lock bolt 906 presses against the bottom surface of access blind 907, so that sealing strip 909 is in snug contact with sealing surface 910.

The guide groove 904 is provided with a locking bolt 906, when in maintenance, a maintenance blind plate 907 is inserted into the guide groove 904, and the locking bolt 906 is pulled by a spanner. The lock bolt 906 presses the access blind plate 907 to enable the sealing strip 909 to be in close contact with the sealing surface 910, and the access blind plate 907 cuts off a channel between the upper chute 903 and the lower chute 905.

Set up flat-plate gate 8 between coke discharge system 7 and the dry quenching stove export 15, coke discharge system still sets up vibrating feeder 10, rotary seal valve 11, chute 12 and fortune burnt belt 13, prior art, flat-plate gate 8 below originally be equipped with transition chute 14, in this embodiment, cancel transition chute 14 and replace with discharge trip valve 9, discharge trip valve 9 installs the position department between flat-plate gate 8 below and vibrating feeder 10 top. The invention forms an air inlet closed circuit system in the dry quenching furnace by arranging the discharge cut-off valve 9 and the circulating air cut-off valve 2.

A channel 912 is arranged in the guide frame 911 and is communicated with the upper chute 903 and the lower chute 905, and a wear-resistant lining plate can be additionally arranged on the inner wall of the guide frame 911.

As shown in FIG. 14, the upper taper 915 of the lower chute 905 is larger than the lower taper 914 of the upper chute 903, so that coke can be effectively prevented from entering the guide groove 904, and the abrasion of the coke on the lower chute 905 is reduced.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air inlet closed circuit system of a dry quenching furnace comprises a primary dedusting unit (28) and a boiler (30), wherein the boiler body is communicated with the boiler body, the boiler body is divided into a pre-storage section (25) and a cooling section (23) from top to bottom, an upper annular air duct (24) is formed by the boiler body at a position between the pre-storage section (25) and the cooling section (23) correspondingly, a coke discharge system (7) and a circulating air inlet system (6) are arranged at the bottom of the dry quenching furnace, the circulating air inlet system (6) comprises a circulating fan (31), an upper air chamber connecting pipe (4), a lower air chamber connecting pipe (5), an upper air chamber (19) and a lower air chamber (17), the upper air chamber (19) and the lower air chamber (17) are communicated with the boiler body, a flap valve (3) is arranged at the outlet of the circulating fan (31), and the flap valve (3) is respectively connected with the upper air chamber (19) and the lower air chamber (17) through the upper air chamber connecting pipe (4) and the lower air chamber connecting pipe (5), circulating air flow in the furnace body enters a cooling section (23) through an upper air chamber (19) and a lower air chamber (17) and returns to a circulating fan (31) through an upper annular air duct (24), a primary dust removal unit (28) and a boiler (30); the coke discharging system (7) is provided with a flat gate (8), and is characterized in that: the circulating air inlet system (7) is provided with a circulating air cut-off valve (2) at the outlet of the circulating fan (31); and a discharge cut-off valve (9) is arranged below the flat gate (8).

2. The air intake closed-circuit system of the dry quenching furnace of claim 1, wherein: the circulating air cut-off valve (2) is arranged between the circulating fan (31) and the flap valve (3), and the circulating air cut-off valve (2) is a totally-enclosed type flap valve.

3. The air intake closed-circuit system of the dry quenching furnace of claim 1, wherein: the discharge cutoff valve (9) comprises a chute body (901), a blind flange (902) and an overhaul blind plate (907), wherein the chute body (901) comprises an upper chute (903), a guide groove (904) and a lower chute (905), the guide groove (904) is connected between the upper chute (903) and the lower chute (905), a guide frame (911) or the overhaul blind plate (907) is arranged in the guide groove (904), guide groove flanges (13) are arranged on two sides of the guide groove (904), and the blind flange (902) is arranged outside the guide groove flanges (913).

4. The air intake closed-circuit system of the dry quenching furnace as claimed in claim 3, wherein: the maintenance blind plate (907) is provided with a sealing groove (908), a sealing strip (909) is arranged in the sealing groove (908), the guide groove (904) is provided with a sealing surface (910), and the sealing strip (909) is connected with the maintenance blind plate (907) and the sealing surface (910) in a sealing mode.

5. The air intake closed-circuit system of the dry quenching furnace as claimed in claim 4, wherein: and a locking bolt (906) is arranged on the guide groove (904), the locking bolt (906) presses an inspection blind plate (907) to enable a sealing strip (909) to be in tight contact with a sealing surface (910), and the inspection blind plate (907) cuts off a channel between the upper chute (903) and the lower chute (905).

6. The air intake closed-circuit system of the dry quenching furnace of claim 1, wherein: the coke discharging system (7) is further provided with a vibrating feeder (10), a rotary sealing valve (11), a chute (12) and a coke conveying belt (13), and the discharging cut-off valve (9) is installed at a position between the lower portion of the flat gate (8) and the upper portion of the vibrating feeder (10).

7. The air intake closed-circuit system of the dry quenching furnace as claimed in claim 3, wherein: a channel (912) is arranged in the guide frame (911) and is communicated with the upper chute (903) and the lower chute (905).

8. The air intake closed-circuit system of the dry quenching furnace as claimed in claim 3, wherein: the upper taper (915) of the lower chute (905) is larger than the lower taper (914) of the upper chute (903).