CN113969348B

CN113969348B - Initial section blowing method of sintering machine blowing process

Info

Publication number: CN113969348B
Application number: CN202010716675.1A
Authority: CN
Inventors: 陈思墨; 叶恒棣; 李谦; 刘前; 周浩宇; 王业峰
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2023-06-23
Anticipated expiration: 2040-07-23
Also published as: CN113969348A

Abstract

The invention discloses a method for blowing an initial section of a sintering machine blowing process, which comprises the following steps: the material enters a heat preservation section for heat preservation after being ignited by an ignition furnace device; the heat preservation is carried to a gas injection unit for injecting gas, the starting point of an injection starting section of the gas injection unit is the 4 th to 5min of sintering, and the end point of the gas injection starting section is the 5 th to 7.5min of sintering; after passing through the gas injection unit, the gas enters a gas steam coupling unit, the starting point of a steam injection starting section of the gas steam coupling injection unit is 8-9min of sintering, and the end point of the steam injection starting section is 9-11min of sintering; and the gas concentration of the gas injection initial section adopts an increasing gradient ratio, and the steam concentration of the steam injection initial section is an increasing gradient ratio. The gas injection starting section is reasonable in arrangement within the range, so that the ignition phenomenon is avoided, and the sintering effect is enhanced. In the above range, the steam blowing initiation section can improve the air permeability of the material layer and reduce the burnup, and does not easily cause the extinction of the formed burning zone.

Description

Initial section blowing method of sintering machine blowing process

Technical Field

The invention relates to the technical field of sintering, in particular to a starting section blowing method of a sintering machine blowing process.

Background

Sintering is a main raw material processing technology for steel smelting in China, and more than 75% of blast furnace raw materials are derived from sinter.

At present, the head of the sintering machine is provided with an ignition furnace, an ignition burner is arranged in the ignition furnace, a sintering machine trolley is arranged on the sintering machine in an end-to-end mode, wheels of the sintering machine trolley are arranged on a sintering machine track, and the sintering machine trolley runs along the sintering machine track. A bottom air box is arranged below the sintering machine track, the upper part of the air box corresponds to the bottom of the trolley, and the lower part of the air box is connected with a sintering large flue. The sintering of the device mainly utilizes pulverized coal combustion to generate a large amount of heat, so that the energy consumption is higher and the emission pollution is heavier.

In view of the above technical problems, gas injection and steam injection enhanced sintering technologies are proposed, and the two technologies are advanced sintering greening transformation technologies at present.

Specifically, compared with a conventional sintering machine, the gas injection enhanced sintering technology is that a gas injection cover is additionally arranged at the upper part of a sintering machine trolley behind an ignition furnace, and a gas injection pipe is arranged in the gas injection cover. The gas injection technology is to replace part of the coke powder added by sintering by injecting gas below the lower limit of the explosion concentration of the gas to the surface of the sinter bed after the ignition furnace, so that the gas enters the sinter bed from the surface of the bed and burns near the upper part of the burning zone. The technology can effectively reduce the consumption of the coke powder and the emission of pollutants in the whole production process. In addition, the technology can also effectively avoid the overhigh sintering peak temperature, prolong the sintering high-temperature holding time and improve the quality of the sintering ore.

In addition, compared with the conventional sintering machine, the steam injection sintering technology is that a steam injection pipe is arranged at the upper part of a sintering machine trolley behind an ignition furnace. The steam injection technology is to inject steam on the surface of the sinter bed, so that the steam passes through the upper sintered ore and then contacts the coke powder of the combustion zone to react, the water gas reaction is utilized to play a role in strengthening the combustion of the coke powder, the combustion is more complete, the combustion efficiency and the quality of the sinter are improved, and the use amount of the coke powder is reduced.

However, for the gas injection starting section, the better the gas injection starting point is, but before the gas injection starting point is set, the fire is easy to catch; for the steam injection starting section, the steam injection starting point is forward, so that the air permeability of the material layer can be improved, the burn-up can be reduced, but before the steam injection starting point is set, the just-formed burning zone is easy to extinguish.

Therefore, how to provide a starting section blowing method of a sintering machine blowing process, to set a reasonable blowing starting section, and to ensure sintering effect is a technical problem to be solved in the art.

Disclosure of Invention

Therefore, the invention aims to provide a starting section blowing method of a sintering machine blowing process, which is provided with a reasonable blowing starting section and ensures sintering effect.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a method of starting section blowing of a sintering machine blowing process for a gas-steam coupled sintering machine, the gas-steam coupled sintering machine comprising:

a sintering pallet running along a sintering direction and an ignition furnace device arranged above the sintering pallet;

the gas steam coupling device is arranged above the sintering trolley and positioned behind the ignition furnace device along the sintering direction;

the gas-steam coupling device sequentially comprises a gas blowing unit, a gas-steam coupling blowing unit and a steam blowing unit which are mutually isolated along the sintering direction;

the initial stage blowing method comprises the following steps:

the material enters a heat preservation section for heat preservation after being ignited by an ignition furnace device;

the gas is conveyed to the gas blowing unit for blowing gas after heat preservation, the starting point of the blowing starting section of the gas blowing unit is the 4 th to 5 th min of sintering, and the end point of the gas blowing starting section is the 5 th to 7.5 th min of sintering;

after passing through a gas injection unit, the gas enters a gas steam coupling unit, the starting point of a steam injection starting section of the gas steam coupling injection unit is 8-9min of sintering, and the end point of the steam injection starting section is 9-11min of sintering;

and the gas concentration of the gas injection initial section adopts an increasing gradient ratio, and the steam concentration of the steam injection initial section is an increasing gradient ratio.

Preferably, in the above-mentioned initial stage injection method, the gas concentration in the gas initial stage is lower than the lower limit of the gas explosion concentration,

wherein c _r ＝AKc _r0 ，c _r C is the gas concentration of the gas initial stage _r0 A is the lower limit of the explosion concentration of the fuel gas, A is the safety constant of the fuel gas injection, 60-80% is generally taken, and K is the fuel gas injectionThe uniformity coefficient is generally 50 to 90%.

Preferably, in the above-mentioned method for injecting steam in the initial stage, the steam concentration c in the initial stage of steam injection _z The method comprises the following steps:

wherein A is a steam injection safety constant, and generally 80-90% is taken; c ₀ For safe steam concentration, generally 0.15-0.18%, t _l For the material level temperature, t _z Is the steam temperature.

Preferably, in the above-mentioned method for injecting gas into the initial stage, the gas concentration in the gas injection initial stage is two, and the steam concentration in the steam injection initial stage is two.

Preferably, in the above-mentioned initial stage injection method, the gas-steam coupling device further includes: the inside of the coupling blowing cover is divided into a first cavity, a second cavity and a third cavity in sequence along the sintering direction through a partition plate; the gas injection unit is arranged in the first cavity close to the ignition furnace device, the steam injection unit is arranged in the third cavity far away from the ignition furnace device, and the gas steam coupling injection unit is arranged in the second cavity.

Preferably, in the above-mentioned initial stage injection method, the gas injection unit includes:

a gas pipeline connected with the gas main pipeline;

the automatic gas ball valve is arranged on the gas pipeline and used for controlling the opening size of the gas pipeline;

a gas flow meter disposed on the gas line for monitoring the flow of gas therethrough;

and the gas nozzle is used for spraying the gas passing through the gas automatic ball valve, and is arranged in the first cavity.

Preferably, in the above-mentioned initial stage blowing method, the steam blowing unit includes:

a steam line connected to the steam header line;

the steam automatic ball valve is arranged on the steam pipeline and used for controlling the opening size of the gas pipeline;

a steam flow meter disposed on the steam line for monitoring a flow of steam therethrough;

and a steam nozzle for ejecting steam passing through the automatic steam ball valve, the steam nozzle being installed in the third chamber.

Preferably, in the above-mentioned initial stage injection method, the gas-steam coupled injection unit includes:

a gas coupling pipeline connected with the gas main pipeline and a steam coupling pipeline connected with the steam main pipeline;

the gas coupling pipeline and the steam coupling pipeline are respectively connected with the corresponding metering proportioning device;

the mixing device is used for mixing the fuel gas and the steam passing through the metering proportioning device and inputting the fuel gas and the steam into a fuel gas steam coupling pipeline;

and the mixing nozzle is used for spraying the gas mixed by the mixing device, and is arranged in the second cavity.

the gas injection unit and the steam injection unit are mutually independent;

the height from the gas nozzle of the gas blowing unit to the sintering material surface is smaller than the height from the steam nozzle of the steam blowing unit to the sintering material surface.

According to the technical scheme, the starting section injection method of the injection process of the sintering machine is used for the gas-steam coupled sintering machine, the starting section of the gas injection is reasonably arranged within the range, the ignition phenomenon is avoided, and the sintering effect is enhanced. Specifically, the above arrangement is used for supplementing heat to the upper material area which does not obtain heat accumulated by the heat accumulation effect and is most required to supplement heat. After the material layer is integrally reduced in carbon, the gas injection starting time and the concentration are reasonable, the upper material is timely subjected to gas heat supplement, the defective rate of the upper material sinter is reduced, the integral gas injection enhanced sintering effect is obvious, sintering is facilitated, and production safety is improved.

In the above range, the steam blowing initiation section can improve the air permeability of the material layer and reduce the burnup, and does not easily cause the extinction of the formed burning zone. Specifically, the low-concentration steam blowing is carried out in the steam blowing initial section, the steam concentration is reasonable, the air permeability of the material layer is improved, the burning consumption is reduced, the influence of the fire extinguishment of the steam on the burning zone is partially avoided, the negative influence of the heat absorption of the steam is reduced, the reinforced sintering effect is more remarkable, and the production safety is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a first structure of a gas-steam coupled sintering machine disclosed in an embodiment of the present invention;

FIG. 2 is a diagram of a first gas-steam coupling circuit disclosed in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a second structure of a gas-steam coupled sintering machine according to an embodiment of the present invention;

FIG. 4 is a diagram of a second gas-steam coupling circuit disclosed in an embodiment of the present invention;

FIG. 5 is a schematic illustration of a blowing initiation section blowing method disclosed in an embodiment of the present invention;

FIG. 6 is a graph of injection concentration at the initial stage of gas injection disclosed in the example of the present invention;

fig. 7 is a graph of injection concentration at the beginning of steam injection disclosed in an embodiment of the invention.

Detailed Description

In view of the above, the core of the present invention is to provide a method for injecting the initial stage of the injection process of the sintering machine, which is provided with a reasonable injection initial stage, so as to ensure the sintering effect.

In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

As shown in fig. 1 to 7, the invention discloses a method for starting stage injection of injection process of sintering machine, which is used for a gas-steam coupled sintering machine, wherein the gas-steam coupled sintering machine comprises a sintering trolley 3 running along a sintering direction and an ignition furnace device arranged above the sintering trolley 3, and the ignition furnace device comprises an ignition furnace cover 1 and an ignition burner 2 arranged in the ignition furnace cover. The sintering machine trolley 3 is installed on the sintering machine in an end-to-end mode, wheels of the sintering machine trolley 3 are installed on the sintering machine track 6, and the sintering machine trolley 3 runs along the sintering machine track 6. An air box 4 is arranged below the sintering machine track 6, the upper part of the air box 4 corresponds to the bottom of the sintering machine trolley 3, and the lower part of the air box 4 is connected with a sintering large flue 5. On this basis, the sintering machine in this application still includes setting up in sintering trolley 3 top and being located the gas steam coupling device of ignition furnace device along the rear of sintering direction, and this gas steam coupling device includes mutual isolated gas injection unit 05, gas steam coupling injection unit 03 and steam injection unit 04 along the sintering direction in proper order.

For the sintering machine, the using method of blowing in the initial section comprises the following steps: the material enters a heat preservation section for heat preservation after being ignited by an ignition furnace device; the heat preservation is carried to a gas injection unit 05 for injecting gas, the starting point of an injection starting section of the gas injection unit 05 is the 4 th to 5min of sintering, and the end point of the gas injection starting section is the 5 th to 7.5min of sintering; the gas passes through the gas injection unit and then enters the gas steam coupling unit 03, the starting point of the steam injection starting section of the gas steam coupling injection unit 03 is 8-9min of sintering, and the end point of the steam injection starting section is 9-11min of sintering; and the gas concentration of the gas injection initial section adopts an increasing gradient ratio, and the steam concentration of the steam injection initial section is an increasing gradient ratio.

The gas injection starting section is reasonable in arrangement within the range, so that the ignition phenomenon is avoided, and the sintering effect is enhanced. Specifically, the above arrangement is used for supplementing heat to the upper material area which does not obtain heat accumulated by the heat accumulation effect and is most required to supplement heat. After the material layer is integrally reduced in carbon, the gas injection starting time and the concentration are reasonable, the upper material is timely subjected to gas heat supplement, the defective rate of the upper material sinter is reduced, the integral gas injection enhanced sintering effect is obvious, sintering is facilitated, and production safety is improved.

In addition, the gas and the steam are injected in the coupling way at the initial section, the problems of rapid cooling and heat absorption of the steam are solved by utilizing the heat supplement of the gas, the problem that the gas injection is easy to ignite by local high-temperature points is solved by utilizing the steam to extinguish the fire, the defect that the gas injection and the steam injection are used independently is overcome, the enhanced sintering effect is fully exerted, and the injection efficiency and the production safety are improved.

In a specific embodiment, the gas concentration in the gas initial stage is lower than the lower limit of the gas explosion concentration, wherein c _r ＝AKc _r0 ，c _r C is the gas concentration of the gas initial stage _r0 The lower limit of the gas explosion concentration is that A is the safety constant of gas injection, 60-80% is generally taken, K is the uniformity coefficient of gas injection, and 50-90% is generally taken. The gas concentration of the gas initial section can be adjusted according to actual needs and is within the protection range.

In a further embodiment, the steam concentration c of the initial stage of the steam injection _z The method comprises the following steps:

wherein A is a steam injection safety constant, and generally 80-90% is taken; c ₀ For safe steam concentration, generally 0.15-0.18%, t _l For the material level temperature, t _z Is the steam temperature. Generally, a backward steam injection starting point and smaller steam concentration are adopted, but the total steam injection amount is smaller, and the effect is weaker. In order to improve the total steam blowing amount and the blowing effect, different steam concentrations can be adopted according to the material surface temperature. Preferably, the steam concentration of the steam injection starting section adopts an increasing gradient proportion. In the steam injection starting section, fuel gas and steam are injected in a coupling way, and the fuel gas supplements the material layer to reduce the steam fire extinguishing effect, so that the steam injection starting point moves forward, and the injection concentration and the injection total amount of the fuel gas can be improved.

Because of the limitation of arrangement space, injection uniformity and cost of the gas and steam injection equipment, it is impossible to set an infinite number of sets of injection equipment with different concentrations, so that the injection starting section of the gas and steam can be equally divided into 2 concentration sections according to actual conditions, and can be practically divided into multiple concentration sections with 3 or more concentration sections according to requirements. The concentration of each concentration section can be set according to actual needs and is within a protection range.

Wherein the gas injection unit 05 in fig. 3 forms the gas injection pipe 8 in fig. 1 and 2; the steam blowing unit 04 forms a steam blowing pipe 10; the gas-steam coupling injection unit 03 in fig. 3 forms the coupling injection pipe 9 in fig. 2. The sintering machine disclosed in the application couples gas injection and steam injection on one sintering machine, so that the sintering machine has the advantages of gas injection and steam injection at the same time.

In addition, the upper material area which is most required to be complemented with heat is complemented with heat by gas injection. After the whole carbon of the sinter is reduced, the upper material area which needs the heat supplement is subjected to heat supplement by gas injection. The gas spraying start time is reasonable, the upper material is timely subjected to gas heat compensation, so that the quality of the upper finished product sintered ore is improved, the integral gas spraying reinforced sintering effect is obvious, and the sintering is facilitated. Namely, the gas injection can supplement heat to the temperature drop generated by the steam, and the steam can cool the local high temperature generated by the gas, so that the influence of the steam temperature drop and the local high temperature of the gas can be eliminated, and the sintering effect is ensured.

Further, since the start points of the gas injection and the steam injection are different and the durations of the two are also different, only the overlapping portions of the two are coupled.

In a specific embodiment, the gas-steam coupling device further comprises a coupling blowing cover 7. Specifically, the interior of the coupling injection cover 7 is divided into a first chamber (a in fig. 1 and 3), a second chamber (B in fig. 1 and 3), and a third chamber (C in fig. 1 and 3) in this order in the sintering direction by a partition plate 11. Wherein the gas injection unit 05 is arranged in a first cavity close to the ignition furnace device, the steam injection unit 04 is arranged in a third cavity far away from the ignition furnace device, and the gas steam coupling injection unit 03 is arranged in a second cavity. The shape, size, etc. of the coupling blowing cover 7 are not particularly limited herein.

The gas injection starting point is the sintering time of 4-5min, the steam injection starting point is the sintering time of 8-9min, and a gas injection section is arranged between the two time points, namely the section corresponds to the gas injection unit 05. In the gas injection section, a gas injection start section exists from the gas injection start point. The gas spraying duration is 8-9min, the steam spraying duration is 6-7 min, the gas spraying end point is 13-14 min of sintering, and the steam spraying end point is 15-16 min of sintering. The coupling blowing section is arranged between the steam blowing start point and the gas blowing end point, namely the section corresponds to the gas steam coupling blowing unit 03. Within the coupled blowing section, a steam blowing initiation section exists starting from a steam blowing initiation point. The gas injection end point to the steam injection end point are steam injection sections, namely, the steam injection units 05 are correspondingly used for realizing the purpose. Specifically, the gas-steam coupling injection unit 03 is used in a material surface area where gas-steam coupling injection is required, the steam injection unit 04 is used in a material surface area where only steam injection is required, and the gas injection unit 05 is used in a material surface area where only gas injection is required. This section relates to the specific requirements of the device in use.

In a specific embodiment, the gas injection unit 05 includes: gas pipeline, gas automatic ball valve 051, gas flowmeter 052 and gas nozzle 054. The gas pipeline is connected with the gas main pipeline, and the gas automatic ball valve 051 is arranged on the gas pipeline and used for controlling the opening size of the gas pipeline; the gas flowmeter 052 is arranged on the gas pipeline and used for monitoring the gas flow flowing through the gas pipeline so as to calculate whether the required gas flow requirement is met; the gas nozzle 054 is used for spraying the gas passing through the gas automatic ball valve 051, namely, realizing gas spraying, and the gas nozzle 054 is preferably arranged in the first cavity. Only one specific structure of the gas injection unit 05 is disclosed herein, and in practice, a corresponding structure may be added to the gas pipe according to different needs.

On the basis of the technical scheme, the gas guide piece used for guiding the gas distribution is arranged in the gas pipeline and between the gas nozzle 054 and the sintering material. The gas pipeline specifically comprises a first gas guide member 053 arranged in the gas pipeline and a second gas guide member 055 arranged between the gas nozzle 054 and the gas sintering material 056, and the gas guide member is arranged to ensure the blowing uniformity and accuracy of gas blowing. The structure of the gas guide piece can be set according to different requirements and is in a protection range.

The steam blowing unit 04 in the present application includes: a steam pipeline, a steam automatic ball valve 041, a steam flowmeter 042 and a steam nozzle 044. Wherein, the steam pipeline is connected with the steam main pipeline, and the steam automatic ball valve 041 is arranged on the steam pipeline for controlling the opening size of the steam pipeline; a steam flow meter 042 is provided on the steam line for monitoring the flow of steam therethrough to calculate whether the required steam flow requirement is met; the steam nozzle 044 is used for jetting out the steam passing through the steam automatic ball valve 041, i.e. realizing steam blowing, and the steam nozzle 044 is preferably arranged in the third cavity. Only one specific structure of the steam blowing unit 04 is disclosed herein, and in practice, corresponding structures may be added to the steam pipe according to different needs.

On the basis of the technical scheme, steam guide pieces for guiding steam distribution are arranged in the steam pipeline and between the steam nozzle 044 and the sintering material. The steam injection device specifically comprises a first steam guide 043 arranged in a steam pipeline and a second steam guide 045 arranged between a steam nozzle 044 and a steam sintering material 046, and the steam injection device is used for guaranteeing the injection uniformity and accuracy of steam injection. The structure of the steam guide can be set according to different requirements and is in the protection range.

The gas-steam coupling blowing unit 03 disclosed in the present application includes: steam coupling pipeline, gas steam coupling pipeline, metering proportioning device 031, mixing device 032 and mixing nozzle 034. The steam coupling pipeline is connected with the steam main pipeline and used for providing steam, and the fuel gas coupling pipeline is connected with the fuel gas main pipeline and used for providing fuel gas; the metering proportioning device 031 is connected with the gas coupling pipeline and the steam coupling pipeline to meter the gas and the steam respectively; the mixing device 032 is connected with the output end of the metering and proportioning device 031, mixes the fuel gas and steam passing through the metering and proportioning device 031 and inputs the fuel gas and steam coupling pipeline; the mixing nozzle 034 ejects the gas mixed by the mixing device 032, and the mixing nozzle 034 is installed in the second chamber. The gas and steam ratio can be accurately adjusted through the metering and proportioning device 031, so that the gas quantity and the steam quantity of the injected sintering material are more accurate, the injection efficiency is improved, and the consumption of the gas and the steam and the gas escape risk are reduced. Since the gas and steam do not react, the gas and steam can be mixed and then sprayed out through the same nozzle in this embodiment.

In order to improve the uniformity of flow in the tube after mixing, the impact on the elbow is reduced, and a mixing guide is arranged in the pipeline after the mixing device 032 and between the mixing nozzle 034 and the sintering material. In particular, the mixing baffle comprises a first baffle 033 disposed in the pipeline after the mixing device 032 and a second baffle 035 disposed between the mixing nozzle 034 and the mixing section sinter 036. The flow guiding piece has the same structure as the fuel gas flow guiding piece arranged in the fuel gas pipeline and the steam flow guiding piece arranged in the steam pipeline. In addition, the guide piece between the nozzle and the sintering material is a guide plate calculated and designed according to the uniform injection principle, so that the uniformity and the accuracy of the mixed gas injected into the material surface are improved.

The above metering and proportioning device 031 is provided with a steam ball valve 0311 at the upstream according to the steam flowing direction, a steam flowmeter 0312 at the downstream, a gas ball valve 0313 at the upstream according to the gas flowing direction, a gas flowmeter 0314 at the downstream, and the proportioned steam and gas enter the mixing device 032 for mixing.

The mixing device 032 referred to in this application is a pipe static mixer.

In practice, a gas-steam coupled injection unit 03 is also provided, in particular a steam injection unit 04 and a gas injection unit 05 arranged independently of each other in the second chamber. The specific structures of the steam blowing unit 04 and the gas blowing unit 05 in the gas-steam coupled blowing unit 03 are the same as those of the steam blowing unit 04 located in the third chamber and the gas blowing unit 05 located in the first chamber disclosed in the above embodiments. When the device works, steam flows through the steam blowing unit in the second cavity and then flows through the steam blowing unit in the third cavity; the fuel gas flows through the fuel gas injection unit in the first cavity and then flows through the fuel gas injection unit in the second cavity.

The gas-steam coupled injection unit 03 disclosed herein differs from the gas-steam coupled injection unit 03 in the above-described embodiment in that the gas and the steam are not mixed, but only the gas nozzle and the steam nozzle are provided simultaneously in the second chamber. And the gas nozzle is positioned below the steam nozzle so as to ensure that the steam with higher density sprayed from the upper part can prevent the gas with lower density from escaping and the gas is wrapped and clamped into the sintering material. The gas nozzles and the steam nozzles can be arranged according to different requirements, for example, the gas nozzles and the steam nozzles are arranged in a staggered way.

In a further embodiment, the sintering machine further comprises a gas analysis device 02, the gas analysis device 02 comprising: a gas thermometer 022 provided on the gas line for obtaining the temperature of the gas and a gas heating value analyzer 021 for obtaining heating value data; a steam thermometer 023 provided on the steam line for acquiring the temperature of the steam. The gas analysis device 02, according to the flow direction of the steam, firstly enters the steam manifold thermometer 023 and then is connected with the steam ball valve 0311 in the metering and proportioning device 031. According to the flowing direction of the fuel gas, the fuel gas from the removing device 01 passes through the fuel gas heat value analyzer 021, then passes through the fuel gas manifold thermometer and is connected with the fuel gas ball valve 0313 in the metering proportioning device 031. The arrangement can be convenient for adjusting the flow of the fuel gas and the steam.

The nozzle in the application is a high-efficiency injection nozzle which can improve the oxygen amount entering the material surface, the injection uniformity and the precision by using the air flow multiplication technology. Reference herein to gas includes, but is not limited to, coke oven gas, natural gas, and impurities in gas include, but are not limited to, coal tar, solid particulates.

In the specific use process, the gas injection concentration can be set to be 0.25% -1.6%, the steam injection concentration is set to be 0.25% -0.47%, and the coke powder ratio is 4.92% -5.02%. In particular, the gas injection concentration and the gas injection concentration can be the same or different along the running direction of the sintering machine; more preferably, different concentrations may be employed; most preferably, the combustion gas adopts an attenuation gradient proportion and the steam adopts an increasing gradient proportion along the running direction of the sintering machine. The specific values may be defined according to different needs and are within the scope of protection.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

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. A method of starting section blowing of a sintering machine blowing process, characterized by a sintering machine for gas-steam coupling, the gas-steam coupled sintering machine comprising:

a sintering trolley (3) running along a sintering direction and an ignition furnace device arranged above the sintering trolley (3);

a gas-steam coupling device arranged above the sintering pallet (3) and positioned behind the ignition furnace device in the sintering direction;

the gas-steam coupling device sequentially comprises a gas injection unit (05), a gas-steam coupling injection unit (03) and a steam injection unit (04) which are mutually isolated along the sintering direction;

the initial stage blowing method comprises the following steps:

the gas is conveyed to the gas injection unit for injecting the gas after heat preservation, the starting point of the injection starting section of the gas injection unit is the 4 th to 5 th min of sintering, and the end point of the gas injection starting section is the 5 th to 7.5 th min of sintering;

after passing through a gas injection unit, the gas enters a gas steam coupling unit, the starting point of a steam injection starting section of the gas steam coupling injection unit is 8min-9min of sintering, and the end point of the steam injection starting section is 9min-11min of sintering;

2. The method of injecting fuel gas into a fuel gas injection molding process according to claim 1, wherein the fuel gas concentration in the fuel gas injection molding process is lower than a lower limit of the fuel gas explosion concentration,

wherein c _r ＝AKc _r0 ,c _r C is the gas concentration of the gas initial stage _r0 The lower limit of the gas explosion concentration is that A is the safety constant of gas injection, 60-80% is generally taken, K is the uniformity coefficient of gas injection, and 50-90% is generally taken.

3. According to claim 2A method for blowing the initial section, characterized in that the steam concentration c of the initial section of the steam blowing _z The method comprises the following steps:

4. The method of claim 1, wherein the gas concentration in the gas injection start section is two, and the steam concentration in the steam injection start section is two.

5. The starter propagation blowing method of claim 1, wherein the gas-steam coupling device further comprises: the inside of the coupling blowing cover (7) is divided into a first cavity, a second cavity and a third cavity along the sintering direction by a partition plate (11); the gas injection unit (05) is arranged in the first cavity close to the ignition furnace device, the steam injection unit (04) is arranged in the third cavity far away from the ignition furnace device, and the gas steam coupling injection unit (03) is arranged in the second cavity.

6. The start-up section blowing method according to claim 5, the gas blowing unit (05) comprising:

a gas pipeline connected with the gas main pipeline;

a gas automatic ball valve (051) which is arranged on the gas pipeline and used for controlling the opening size of the gas pipeline;

a gas flow meter (052) disposed on the gas line for monitoring the flow of gas therethrough;

a gas nozzle (054) for ejecting gas passing through the gas automatic ball valve (051), the gas nozzle (054) being mounted in the first chamber.

7. The starter stretch blowing method according to claim 5, the steam blowing unit (04) comprising:

a steam line connected to the steam header line;

a steam automatic ball valve (041) arranged on the steam pipeline and used for controlling the opening size of the gas pipeline;

a steam flow meter (042) disposed on the steam line for monitoring the flow of steam therethrough;

a steam nozzle (044) for ejecting steam passing through the steam automatic ball valve (041), the steam nozzle (044) being mounted in the third chamber.

8. The starter stretch blowing method according to claim 5, the gas-steam coupled blowing unit (03) comprising:

a metering proportioning device (031), the gas coupling pipeline and the steam coupling pipeline are respectively connected with the corresponding metering proportioning device (031);

a mixing device (032), wherein the mixing device (032) mixes the fuel gas and the steam passing through the metering proportioning device (031) and inputs the fuel gas and the steam into a fuel gas steam coupling pipeline;

and a mixing nozzle (034) for spraying the gas mixed by the mixing device (032), wherein the mixing nozzle (034) is arranged in the second cavity.

9. The starter stretch blowing method according to claim 5, the gas-steam coupled blowing unit (03) comprising:

the gas injection unit (05) and the steam injection unit (04) are mutually independent;

the height from the gas nozzle of the gas blowing unit (05) to the sintering material surface is smaller than the height from the steam nozzle of the steam blowing unit (04) to the sintering material surface.