CN112048617B

CN112048617B - Liquid-gas two-phase medium coupling partition blowing sintering method and blowing device

Info

Publication number: CN112048617B
Application number: CN202010935161.5A
Authority: CN
Inventors: 周浩宇; 范晓慧; 甘敏
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-08-31
Anticipated expiration: 2040-09-08
Also published as: CN112048617A

Abstract

A liquid-gas two-phase medium coupling partition blowing sintering method and a blowing device comprise the following steps: 1) obtaining the particle size D of the mixture to be sintered; 2) conveying the mixture to be sintered into a sintering machine through a trolley for sintering, and blowing gaseous fuel and liquid fuel to the material surface of the trolley in a partition mode; 3) monitoring the volume concentration C of water vapor on the sintering charge surface in each partition when the mixture to be sintered is sintered on the trolley in real time_{Water (W)}And CO volume concentration C_CO(ii) a 4) Data D, C from step 1) and step 3)_{Water (W)}、C_COSelecting one of the injection sintering modes of pure gas fuel sintering, pure liquid fuel sintering and mixed sintering, and adjusting the injection sintering mode in the step 2). The technical scheme of this application, the liquid fuel after utilizing the atomizing mixes with gaseous fuel, improves the combustion value of jetting sintering technique, widens the scope of the jetting volume of jetting sintering technique, satisfies the demand of extreme burning jetting volume.

Description

Liquid-gas two-phase medium coupling partition blowing sintering method and blowing device

Technical Field

The invention relates to a blowing sintering method, in particular to a liquid-gas two-phase medium coupling partition blowing sintering method, belonging to the technical field of mineral aggregate sintering; the invention also relates to a liquid-gas two-phase medium coupling partition blowing device.

Background

The sintering process is a key link in the iron-smelting process, and the principle is that various powdery iron-containing raw materials are mixed with proper amount of liquid fuel and flux, proper amount of water is added, after mixing and pelletizing, the materials are subjected to a series of physical and chemical changes on sintering equipment, and are sintered into blocks, so that the blocks are sent to a blast furnace for the next working procedure. Sintering is a main raw material processing technology for iron and steel smelting in China, and more than 75% of blast furnace raw materials come from sintered ores. But sintering is a typical high energy consumption and high pollution industry, the energy consumption is the second place in the steel industry, and the pollution load is 40 percent of the steel industry and is the top place. With the increasingly strict environmental requirements, research and development of high-energy-efficiency low-emission sintering clean production technology and equipment thereof have great significance for supporting the upgrade of the steel industry in China and realizing green sustainable development.

The gas fuel injection reinforced sintering technology is a relatively advanced green sintering modification technology at the present stage. It is used to replace part of the added coke powder by spraying gaseous fuel diluted to below combustion concentration to the surface of the sintering material layer after the ignition section, so that part of the liquid fuel enters the sintering material layer from the top and is combusted near the upper part of the combustion zone. The technology can effectively avoid overhigh sintering peak temperature and prolong the duration of the beneficial sintering temperature, thereby improving the strength and the reduction degree of the sintered ore, reducing the coke ratio during the production of a blast furnace and effectively reducing CO in the whole production process₂The amount of discharge of (c).

However, the gaseous fuel injection sintering technology in the prior art faces the problem of insufficient combustion energy, and the gaseous fuel combustion cannot provide sufficient combustion energy for the sintering charge surface, so that a large amount of coal has to be doped into the pellets in the process of preparing the sintering mixture, and the production cost is high.

Therefore, it is a technical problem to be urgently needed by those skilled in the art to provide a liquid-gas two-phase medium coupling partition injection sintering method, which utilizes the mixture of atomized liquid fuel and gaseous fuel to increase the combustion value of the injection sintering technology, widen the injection amount range of the injection sintering technology, and meet the requirement of extreme combustion injection amount.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, the present invention aims to improve the combustion value of the injection sintering technique, widen the range of the injection amount of the injection sintering technique, and meet the requirement of the extreme combustion injection amount by mixing the atomized liquid fuel and the gaseous fuel. The invention provides a liquid-gas two-phase medium coupling partition blowing sintering method, which comprises the following steps: 1) obtaining the particle size D of the current mixture to be sintered; 2) conveying the mixture to be sintered into a sintering machine through a trolley for sintering, and blowing gaseous fuel and liquid fuel to the material surface of the trolley in a partition mode; 3) monitoring the sintering of the mixture to be sintered on the trolley in real time,obtaining the volume concentration C of water vapor on the sintering charge level in each current subarea_{Water (W)}And CO volume concentration C_CO(ii) a 4) Data D, C from step 1) and step 3)_{Water (W)}、C_COComparing the data with historical average data stored in the system, selecting one of the injection sintering modes of pure gas fuel sintering, pure liquid fuel sintering and mixed sintering in each partition, and adjusting the injection sintering mode in the step 2).

According to a first embodiment of the invention, a liquid-gas two-phase medium coupling zone blowing sintering method is provided:

a liquid-gas two-phase medium coupling partition blowing sintering method comprises the following steps: 1) obtaining the particle size D of the current mixture to be sintered; 2) conveying the mixture to be sintered into a sintering machine through a trolley for sintering, and blowing gaseous fuel and liquid fuel to the material surface of the trolley in a partition mode; 3) monitoring the volume concentration C of water vapor on the sintering charge surface in each current subarea when the mixture to be sintered is sintered on the trolley in real time_{Water (W)}And CO volume concentration C_CO(ii) a 4) Data D, C from step 1) and step 3)_{Water (W)}、C_COComparing the data with historical average data stored in the system, selecting one of the injection sintering modes of pure gas fuel sintering, pure liquid fuel sintering and mixed sintering in each partition, and adjusting the injection sintering mode in the step 2).

Preferably, the data D, C is combined in step 4)_{Water (W)}、C_COSubstituting the formula (1) to obtain a judgment parameter delta of each partition above the trolley;

judging the size of delta, selecting a blowing sintering mode:

when delta is less than or equal to 1, adopting a sintering mode of pure gas fuel injection sintering;

when delta is more than 1 and less than or equal to 2, adopting a mixed blowing sintering mode;

when delta is larger than 2, a sintering mode of pure liquid fuel injection sintering is adopted;

wherein, D, C_{Water (W)}、C_COThe unit of (A) is mm,%, and percent; d_AverageThe historical average grain size of the mixture to be sintered is mm; c_{Average of water}The historical average volume concentration,%, of water vapor during sintering; c_{Average of CO}Is the historical average volume concentration,%, of CO during sintering; k1 is a particle size coupling coefficient, and the value is 0.6-1.2; k2 is the water vapor concentration coupling coefficient, and the value is 0.4-0.8; k3 is CO concentration coupling coefficient, and its value is 0.4-0.8.

Preferably, step 1) further comprises: obtaining an ash mixing ratio H, an alkalinity ratio J and a solid fuel mixing ratio R of a mixture to be sintered, and comparing the obtained ash mixing ratio H, alkalinity ratio J and solid fuel mixing ratio R with historical average data stored in a system; obtaining a correction judgment parameter delta';

judging the size of delta, selecting a blowing sintering mode:

when delta' is less than or equal to 2, a sintering mode of pure gas fuel injection sintering is adopted;

when delta' is more than 2 and less than or equal to 4, a sintering mode of mixed blowing sintering is adopted;

when delta' is more than 4, a sintering mode of pure liquid fuel injection sintering is adopted;

wherein: H. j, R units are%, and%; h_AverageThe historical average ash blending proportion in the blending of the mixture to be sintered is percent; j. the design is a square_AverageIs the historical average alkalinity proportion,%, in the mixture ingredients to be sintered; r_AverageThe historical average solid fuel ratio in the mixture ingredients to be sintered is percent; k4 is the coupling coefficient of the ash blending proportion, and the value is 0.6-1.0; k5 is alkalinity proportional coupling coefficient, and the value is 0.6-0.8; k6 is the solid fuel proportioning coupling coefficient, and the value is 0.4-0.7.

Preferably, in step 2), the injection of the gaseous fuel and the liquid fuel to the trolley charge level in a zoning mode is specifically as follows: a plurality of groups of gaseous fuel injection devices and liquid fuel injection devices are arranged in the sintering cover body along the advancing direction of the sintering machine; each group of the gaseous fuel injection devices and the liquid fuel injection devices are independently controlled, the gaseous fuel is injected to the trolley charge level through the gaseous fuel injection devices, and the liquid fuel is injected to the trolley charge level through the liquid fuel injection devices.

Preferably, in step 3), the water vapor volume concentration C on the sintering charge surface in each subarea is monitored in real time_{Water (W)}And CO volume concentration C_COThe method specifically comprises the following steps: along the advancing direction of the sintering machine, a plurality of groups of water vapor concentration sensors and CO concentration sensors are arranged in the sintering cover body to monitor the water vapor volume concentration C on the sintering charge surface in each subarea in real time_{Water (W)}And CO volume concentration C_CO。

Preferably, in step 2), the gas fuel injection device and the liquid fuel injection device are positioned right above the sintering material surface of the trolley, the liquid fuel injection device is positioned right above the gas fuel injection device, the gas fuel injection device and the liquid fuel injection device are vertically and downwards injected in a staggered mode, and the injection path of the gas fuel and the injection path of the liquid fuel are formed.

Preferably, the method further comprises the steps of:

5) steam is obliquely sprayed to the center line of the sintering charge surface of the trolley along the two sides of the edge of the liquid fuel spraying device in the advancing direction of the trolley to form a steam cover covering the edge of the sintering area, and a steam spraying path is formed.

Preferably, the method further comprises the steps of:

6) oxygen-enriched gas is horizontally blown to the center central line of the sintering charge surface of the trolley along the two sides of the edge of the trolley in the advancing direction of the trolley, and the blowing path P4 of the oxygen-enriched gas is formed.

Preferably, the gaseous fuel and/or liquid fuel injection in step 2), the steam injection in step 5), and the oxygen-enriched gas injection in step 6) are performed in a combined order.

Preferably, the oxygen-enriched gas injection in step 6) is carried out first, the steam injection in step 5) is carried out, and finally the gaseous fuel and/or liquid fuel injection in step 2) is carried out.

Preferably, the oxygen-enriched gas injection in step 6) and the steam injection in step 5) are carried out simultaneously, and the gaseous fuel and/or the liquid fuel injection in step 2) is carried out.

According to a second embodiment of the invention, a liquid-gas two-phase medium coupling zone blowing device is provided:

a liquid-gas two-phase medium coupled zone blowing device for applying the liquid-gas two-phase medium coupled zone blowing sintering method of the first embodiment, the zone blowing device comprising: the device comprises a gaseous fuel injection device, a liquid fuel injection device, a water vapor concentration sensor, a CO concentration sensor and a particle size recognition device; the particle size recognition device is arranged at the front edge of the sintering machine cover body and is used for recognizing the particle size D of the mixture to be sintered; multiple sets of the water vapor concentration sensors and the CO concentration sensors are arranged in the sintering cover body along the moving direction of the trolley and used for monitoring the water vapor volume concentration C of the sintering charge surface of the trolley_{Water (W)}And CO volume concentration C_CO(ii) a The gas fuel injection devices and the liquid fuel injection devices are arranged in the sintering machine cover body and are positioned above the trolley; the bottom of the gaseous fuel injection device is provided with a gaseous fuel nozzle, and the gaseous fuel injection device injects gaseous fuel to the sintering charge level through the gaseous fuel nozzle; the bottom array of the liquid fuel injection device is provided with a plurality of liquid fuel atomizing nozzles, and the atomized liquid fuel is injected to the sintering charge level through the liquid fuel atomizing nozzles.

Preferably, the liquid fuel injection device is positioned right above the gaseous fuel injection device, and the liquid fuel atomizing nozzle of the gaseous fuel injection device and the gaseous fuel nozzle of the liquid fuel injection device are vertically and downwardly injected in a staggered manner.

Preferably, the liquid fuel injection device is a planar plate-shaped cavity, high-pressure liquid fuel is introduced into the liquid fuel injection device, the liquid fuel is atomized under the action of the liquid fuel atomization nozzle, and the atomized liquid fuel is injected downwards.

Preferably, the liquid fuel injection device is a square plate or a circular plate.

Preferably, the zone blowing device further comprises: and the steam injection devices are arranged on two sides of the edge of the liquid fuel injection device along the advancing direction of the trolley and inject steam obliquely towards the central line of the sintering charge surface of the trolley.

Preferably, the zone blowing device further comprises: and the oxygen supplementing injection devices are arranged on two sides of the edge of the trolley along the advancing direction of the trolley and horizontally inject oxygen-enriched gas to the central line of the sintering charge surface of the trolley.

Preferably, the zone blowing device further comprises: the fuel gas branch pipe, the fuel gas main pipe, the liquid fuel branch pipe and the liquid fuel main pipe are arranged in the fuel gas main pipe; the gaseous fuel main pipe and the liquid fuel main pipe are arranged outside the sintering machine cover body, and the gaseous fuel main pipe is divided into the gaseous fuel branch pipes to be communicated with the gaseous fuel injection device; the liquid fuel main pipe branches the liquid fuel branch pipes and is communicated with the liquid fuel injection device.

First, it is necessary to explain the prior art gaseous fuel (steam) injection process

Fig. 5 is a structural view of a sintering machine with gaseous fuel injection. Compared with the conventional sintering machine, the gaseous fuel injection reinforced sintering technology is characterized in that a gaseous fuel injection device is additionally arranged at the upper part of a sintering machine trolley behind an ignition furnace and consists of a gaseous fuel injection main pipe, a gaseous fuel injection branch pipe, a gaseous fuel injection pipe row and a gaseous fuel injection cover body, wherein the gaseous fuel injection pipe row in the gaseous fuel injection cover body is arranged and installed in parallel with the charge level of the sintering machine and is connected with the gaseous fuel injection main pipe through the gaseous fuel injection branch pipe, a charge level CO detector is arranged near the charge level to monitor the CO concentration value in the charge level area in real time, and a branch pipe flow regulating valve is arranged on the gaseous fuel injection branch pipe to regulate the injected gaseous fuel amount in real time. During the sintering and batching, the coal blending ratio of the material bed is properly reduced, and a part of heat required by sintering is fed into the material bed in a gaseous fuel injection mode. In the sintering process, the gaseous fuel diluted to be below the explosion limit is sprayed to the surface space of the sintering material layer through a gaseous fuel injection pipe, so that the gaseous fuel is pumped into the material layer, and the gaseous fuel is utilized to supplement heat to the sintering material layer, so that the sintering process is strengthened. And steam injection and gas fuel injection are similar, and the structure of the device is basically the same.

Gaseous fuel and steam enter the cover through respective pipe-line system in the left and right sides of jetting cover respectively, and the mounted position of steam jetting bank of tubes needs be a little higher than gaseous fuel jetting bank of tubes, this is because steam pressure is higher, the speed of spouting flow is very fast, if set up the steam pipe in gaseous fuel pipe below, the easy condition that high-pressure steam forms the curtain at the charge level and hinders gaseous fuel to descend appears, and if set up in gaseous fuel pipe above, can play the drainage effect, adsorb the entrainment with gaseous fuel and carry into the bed of material.

Secondly, there are following technical problems in the prior art:

1) slow mixing rate of gaseous fuel and steam

When the gaseous fuel and the steam are blown in the cover, due to different paths, separate medium flow beams are formed respectively, and no scattering device is arranged, so that the mixing speed of the two media is very slow, meanwhile, the mixing speed of the two media and the air is also very slow, and sometimes, the situation that pure gaseous fuel or pure steam is sucked in a local area even occurs;

2) concentration unevenness of gaseous fuel and steam sprayed on the charge surface

Because gaseous fuel and steam mixing rate are slow, and the distance of jetting device apart from the charge level is very limited again, so very easily appear gaseous fuel and steam the concentration inequality that sprays at the charge level, the gaseous fuel volume concentration that each region of sintering charge level inhales, steam volume concentration is diverse promptly to lead to supplementary sintering effect not good, even disturb the condition emergence of sintering normal production.

In summary, the key problem to be solved in structural optimization of the existing gaseous fuel and steam coupling injection device is urgently needed to be a new device structural technology which can rapidly mix the gaseous fuel and the steam uniformly and enable the gaseous fuel and the steam to be uniformly sucked into all areas of a material layer.

In a first embodiment of the present application, the use of liquid fuel atomized injection combined with gaseous fuel injection to supplement the combustion energy of the sinter mass to reduce the use of coal in the process of pelletizing sinter massAnd the energy substances with high cost performance are utilized to reduce the use of the energy substances with low cost performance, thereby reducing the production cost. Because the required content of coal in the unit pellet is reduced, the volume of the whole pellet is reduced, the diameter of the whole pellet is reduced, and external heat can be more quickly transferred to the inside of the sintering mixture, so that the sintering time is reduced, the internal and external uniformity of the sintering mixture is improved, and the sintering quality is improved. In the actual production process, according to the difference of the quality of the mineral aggregate, when the pellets are prepared by sintering materials, the content of coal required to be added is different, so that the diameters of sintering mixture materials in different batches are different. According to the technical scheme, the diameter D of the mixture to be sintered to be ready to enter the sintering machine is obtained firstly, and then the water vapor volume concentration C of the sintering charge level of each subarea is monitored in real time in the sintering process of the sintered mixture_{Water (W)}And CO volume concentration C_CO. Subjecting the data D, C obtained in step 1) and step 3)_{Water (W)}、C_COAnd comparing the data with historical average data stored in the system, and selecting the injection sintering mode which is most suitable for the subarea from three injection sintering modes of pure gas fuel sintering, pure liquid fuel sintering and mixed sintering according to the corresponding comparison mode for sintering.

It should be noted that the whole sintering machine is divided into a plurality of sections along the moving direction of the trolley, a group of gaseous fuel injection devices and liquid fuel injection devices are placed in each section, and meanwhile, a plurality of groups of water vapor concentration sensors and CO concentration sensors are also arranged in each section.

It should be noted that the diameter D of the mixture to be sintered can be obtained according to the target data of the size of the pellet for pelletizing the sintering material; the pellets on the pallet to be fed into the sintering machine can be scanned in an image recognition mode, and the diameter D of the pellets in the batch is obtained.

In the first embodiment of the present application, the determination factor δ is related to the pellet diameter D and the water vapor volume concentration C_{Water (W)}CO volume concentration C_COIn direct proportion, the larger the value of the judgment factor delta is, the larger the additional combustion energy which is required to be supplemented for the subarea is, and compared with the gaseous fuel injection combustion, the liquid fuel atomization injection combustion is adopted to effectively promote the sinteringAnd (4) burning the charge level. The larger the delta, the different blowing sintering modes need to be selected.

It should be noted that the larger the diameter of the sinter mix, the more additional combustion energy is required; the larger the water vapor concentration and the CO concentration are, the water-coal reaction is insufficient, and additional combustion energy needs to be supplemented.

It needs to be further explained that the influence of the pellet particle size of the mixture to be sintered on the air permeability of the material layer is large; when the particle size of the pellets is too large, gaps among the pellets are too large, so that hot gas is easily dispersed outwards from the inside of the material layer, and the temperature fluctuation is large in the sintering process of the pellets in the material layer; when the pellet particle size is too small, can lead to the clearance between the pellet undersize to make the flame of outside burning be difficult to get into the bed of material, lead to the bed of material to conduct heat inadequately, can have the temperature of upper portion sintering jetting too high promptly, and the inside temperature of bed of material not enough condition. Both of these cases lead to a reduction in the quality of pellet sintering.

In the sintering process, in order to fully utilize the combustion heat energy of coal, a certain amount of water vapor is continuously sprayed into the sintering machine in the process by combining the water-gas reaction principle. The water gas reaction is exothermic, and the higher the water vapor concentration is, the more the water gas reaction can be promoted, so that when the water vapor concentration reaches a certain value, the injection of the liquid fuel can be stopped. In the case that other reaction parameters are met, the water gas reaction is sufficiently maintained and positively stimulated, and the injection amount of the liquid fuel can be adaptively reduced or the injection of the liquid fuel can be directly suspended.

It should be further noted that during the water gas reaction, intermediate products are generated, and under the condition of sufficient oxygen, the temperature at the initial stage of the reaction is low, the reaction is insufficient, and a large amount of carbon monoxide is generated. Therefore, when the carbon monoxide concentration is detected to be high, the reaction temperature does not reach the standard, the current injection heat supplement amount is insufficient, and further injection is needed.

In summary, in the formula (1), the pellet particle size and the carbon monoxide concentration have a greater influence on the determination of whether or not the liquid fuel injection heat compensation is adopted.

In the first embodiment of this application, the proportion undersize of joining in marriage the ash then can lead to unable formation sticky pellet, joins in marriage the proportion of ash too big, then the pellet inside that forms is too closely knit, leads to the unable better heating to the pellet inside of outside heat. The same size of the basicity of the pellets also affects the permeability of the pellets themselves. When the air permeability of the pellets is changed due to the adjustment of the process parameters, if the air permeability is reduced, namely the ash content is up to the ratio, and the alkalinity is high, liquid fuel is required to be adopted to blow and sinter the pellets. Similarly, when the solid fuel content increases, the air permeability of the whole pellet is also affected, and it is necessary to blow the pellet with liquid fuel.

In addition, D is_Average、C_{Average of water}、C_{Average of CO}、H_Average、J_Average、R_AverageAre average values obtained in the production enterprise according to the long-term production process. Collecting the particle size of the mixture to be sintered, the volume concentration of water vapor during sintering, the volume concentration of CO during sintering, the ash blending ratio in the mixture to be sintered, the alkalinity ratio in the mixture to be sintered and the solid fuel blending ratio in the mixture to be sintered which are detected each time in the sintering process, storing the data and calculating the average value; and then used for the next calculation, and corresponding control is carried out according to the result obtained by the formula (1) or (2), so that the quality of the sintered ore is ensured.

In a first embodiment of the present application, by providing a separate single set of gaseous fuel injection devices and liquid fuel injection devices for each zone along the direction of the trolley, the amount of energy that the zone is additionally replenished with can be independently controlled. Thereby accurately adjusting the heating of the sintering mixture in the sintering process and improving the sintering quality.

In the first embodiment of this application, set up independent single group steam concentration sensor and CO concentration sensor through every subregion along the platform truck direction, the burning condition of every subregion is detected to the accurate, lays the basis for accurate regulation, improves sintering quality.

In the first embodiment of this application, liquid fuel jetting device sets up in gaseous fuel jetting device's top, is favorable to atomizing the mixture of liquid fuel and gaseous fuel, and the liquid fuel evenly sprays the top of gaseous fuel jetting device after atomizing, makes it and gaseous fuel, air mix to appointed concentration fast, participates in the intensive sintering in the layer together the suction material.

In the first embodiment of the application, steam is obliquely injected to the center midline of the sintering charge surface of the trolley along the two sides of the edge of the liquid fuel injection device in the advancing direction of the trolley to form a steam hood covering the edge of the sintering area. The path of the steam injection is as P3 in fig. 3. The vapor hood can prevent the atomized liquid fuel and gaseous fuel from escaping from both sides of the liquid fuel injection device and the gaseous fuel injection device. The atomized liquid fuel and gaseous fuel are controlled in the sintering zone a.

In a first embodiment of the present application, oxygen-enriched gas is injected horizontally towards the center centerline of the sintering charge of the trolley on both sides of the trolley edge in the advancing direction of the trolley, so that sufficient oxygen can be continuously maintained at the sintering charge, thereby promoting combustion of the atomized liquid fuel and gaseous fuel in the sintering area. It is also possible to prevent the escape of the atomized liquid fuel and gaseous fuel from both sides of the dolly. The oxygen-enriched gas blowing path is P4 in FIG. 3.

In a first embodiment of the present application, the injection of gaseous and/or liquid fuel in step 2), the injection of steam in step 5), the injection of oxygen-enriched gas in step 6), are performed in a combined sequence. Combustion of the atomized liquid fuel and the gaseous fuel in the sintering zone can be promoted.

Specifically, in the first embodiment, the oxygen-enriched gas injection in the step 6) is performed, the steam injection in the step 5) is performed, and the gaseous fuel and/or the liquid fuel injection in the step 2) is performed. Oxygen-enriched gas can be blown on the sintering charge level to prepare oxygen; then the gap at the two sides of the liquid fuel injection device is sealed off by a steam cover; finally, the atomized liquid fuel and the gaseous fuel are injected and blown to perform full combustion.

Specifically, in the second embodiment, the oxygen-rich gas injection in step 6) and the steam injection in step 5) are simultaneously performed, and the gaseous fuel and/or the liquid fuel injection in step 2) is performed. Oxygen-enriched gas can be injected on the sintering charge level at the same time, gaps on two sides of the liquid fuel injection device are sealed through the steam hood, and finally atomized liquid fuel and gaseous fuel are injected for sufficient combustion.

In a second embodiment of the application, a liquid-gas two-phase medium coupling partition injection device combines data of a water vapor concentration sensor, a CO concentration sensor and a particle size recognition device to control a gas fuel injection device and a liquid fuel injection device to inject and sinter a sintering material, so that the supplement of combustion energy can be accurately controlled. Thereby reducing the coal consumption for ball making, improving the quality of integral sintering and saving the production cost.

In a second embodiment of the present application, the liquid fuel injection device is positioned directly above the gaseous fuel injection device to increase the mixing rate of the atomized liquid fuel and the gaseous fuel.

In a second embodiment of the present application, as shown in fig. 7 to 10, the liquid fuel injection device is a square plate or a circular plate.

In a second embodiment of the present application, the steam shroud is formed by blowing steam from both sides of the edge of the liquid fuel injection device in the traveling direction of the cart by the steam injection device.

In a second embodiment of the present application, oxygen-enriched gas is injected from both sides of the edge of the bogie in the advancing direction of the bogie by the oxygen supplementing injection device.

In the second embodiment of the present application, gaseous fuel is supplied to the gaseous fuel injection device through the gaseous fuel branch pipe and the gaseous fuel main pipe; gaseous fuel jetting device specifically is gaseous fuel jetting calandria, and further gaseous fuel jetting calandria still includes many gaseous fuel jetting pipes, and gaseous fuel jetting pipe parallel arrangement is in the platform truck top, and the jetting hole (gaseous fuel spout) have been seted up to gaseous fuel jetting pipe bottom, and gaseous fuel gets into the bed of material after the jetting hole blowout is mixed with atomizing liquid fuel.

In the second embodiment of the application, the liquid fuel injection device is provided with high-pressure liquid fuel through the liquid fuel branch pipe and the liquid fuel main pipe; the high-pressure liquid fuel is atomized by the liquid fuel atomizing nozzle and is sprayed downwards to be mixed with the gaseous fuel.

It should be noted that, when the present invention is used to perform a combined injection production of gaseous and liquid fuels, the gaseous fuel and the fuel oil are respectively injected to the vicinity of the charge level through the respective main pipe and branch pipe and finally discharged from the pipe, and the injection position of the fuel oil is above the gaseous fuel and is atomized before injection. The method can ensure that the fuel oil complementary blowing is carried out on the process section with insufficient blowing concentration so as to ensure the technical effect of the charge level gaseous fuel blowing technology.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the technical scheme, a steel mill can have more choices when a gaseous fuel injection technology is applied, and some plant condition enterprises which do not have coal gas or have expensive coal gas medium can select liquid fuels such as heavy oil and fuel oil with lower cost for atomization injection, so that the degree of freedom is higher;

2. the technical scheme of this application, owing to can use gas, the double-phase fuel of liquid to carry out compound concurrent heating jetting, so the jetting flow range that can adjust improves by a wide margin (the burning heat of jetting improves by a wide margin promptly), and the operative employee can decide whether open double-phase jetting according to current operating mode requirement in a flexible way to and the flow proportion value of double-phase jetting, when meetting special operating mode and need changing jetting volume by a wide margin, also can accomplish freely to have more.

Drawings

FIG. 1 is a flow chart of a liquid-gas two-phase medium coupling partition blowing sintering method in an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a liquid-gas two-phase medium coupling partitioning blowing device according to an embodiment of the present invention;

FIG. 3 is a schematic view showing the arrangement of a steam injection device and an oxygen supplement injection device according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating the position of a particle size recognition device according to an embodiment of the present invention;

FIG. 5 is a schematic view showing a structure of a gaseous fuel injection device according to the prior art;

FIG. 6 is a side view of the exterior of a prior art gaseous fuel injection apparatus;

FIG. 7 is a front view of a square plate of a liquid fuel injection device in accordance with an embodiment of the present invention;

FIG. 8 is a top view of a square plate for a liquid fuel injection device in accordance with an embodiment of the present invention;

FIG. 9 is a front view of a circular plate of a liquid fuel injection device in accordance with an embodiment of the present invention;

FIG. 10 is a top view of a circular plate as used in the liquid fuel injection device of the present invention;

fig. 11 is a plan view showing the arrangement of a plurality of liquid fuel injection devices in the advancing direction of the dolly in the embodiment of the invention.

Reference numerals:

RQ 1: a gaseous fuel injection device; RQ 101: a gaseous fuel nozzle orifice; RQ 2: a gaseous fuel branch pipe; RQ 3: a gaseous fuel manifold; RL 1: a liquid fuel injection device; RL 101: a liquid fuel atomizer; RL 2: a liquid fuel branch pipe; RL 3: a liquid fuel manifold; ZQ 1: a steam injection device; BY 1: an oxygen-supplementing blowing device;

c1: a water vapor concentration sensor; c2: a CO concentration sensor; c3: a particle size recognition device; a: a sintering area; b: a steam hood; l is_In: the center central line of the sintering charge level of the trolley; p1: a blowing path of the gaseous fuel; p2: a path of injection of liquid fuel; p3: a path of steam injection; p4: a path of oxygen-enriched gas injection; s1: a trolley; s2: a cover body.

Detailed Description

judging the size of delta, selecting a blowing sintering mode:

judging the size of delta, selecting a blowing sintering mode:

Preferably, in step 2), the injection of the gaseous fuel and the liquid fuel to the trolley charge level in a zoning mode is specifically as follows: along the advancing direction of the sintering machine, a plurality of groups of gaseous fuel injection devices and liquid fuel injection devices are arranged in the sintering cover body S2; each group of the gaseous fuel injection devices and the liquid fuel injection devices are independently controlled, the gaseous fuel is injected to the trolley charge level through the gaseous fuel injection devices, and the liquid fuel is injected to the trolley charge level through the liquid fuel injection devices.

Preferably, in step 3), the water vapor volume concentration C on the sintering charge surface in each subarea is monitored in real time_{Water (W)}And CO volume concentration C_COThe method specifically comprises the following steps: along the advancing direction of the sintering machine, a plurality of groups of water vapor concentration sensors and CO concentration sensors are arranged in the sintering cover body S2 to monitor the water vapor volume concentration C on the sintering charge level in each subarea in real time_{Water (W)}And CO volume concentration C_CO。

Preferably, in step 2), the gas fuel injection device and the liquid fuel injection device are positioned right above the sintering material surface of the trolley, the liquid fuel injection device is positioned right above the gas fuel injection device, the gas fuel injection device and the liquid fuel injection device are displaced to vertically inject downwards, and the injection path P1 of the gas fuel and the injection path P2 of the liquid fuel are provided.

Preferably, the method further comprises the steps of:

5) the two sides of the edge of the liquid fuel injection device along the advancing direction of the trolley are inclined towards the central line L of the sintering charge surface of the trolley_InSteam is injected to form a steam hood B covering the edge of the sintering area A, and a steam injection path P3 is formed.

Preferably, the method further comprises the steps of:

6) along the two sides of the edge of the trolley in the advancing direction of the trolley, and horizontally towards the central line L of the sintering charge level of the trolley_InBlowing oxygen-enriched gas.

a liquid-gas two-phase medium coupled zone blowing device for applying the liquid-gas two-phase medium coupled zone blowing sintering method of the first embodiment, the zone blowing device comprising: a gas fuel injection device RQ1, a liquid fuel injection device RL1, a water vapor concentration sensor C1, a CO concentration sensor C2 and a particle size recognition device C3; the particle size recognition device C3 is arranged at the front edge of the sintering machine cover body S2 and is used for recognizing the particle size D of the mixture to be sintered; multiple groups of the water vapor concentration sensor C1 and the CO concentration sensor C2 are arranged in the sintering cover body S2 along the moving direction of the trolley S1 and are used for monitoring the water vapor volume concentration C of the sintering charge surface of the trolley S1_{Water (W)}And CO volume concentration C_CO(ii) a Multiple sets of said gaseous fuel jetsThe device RQ1 and the liquid fuel injection device RL1 are provided in the sintering machine cover S2 and above the pallet S1; the bottom of the gaseous fuel injection device RQ1 is provided with a gaseous fuel nozzle RQ101, and the gaseous fuel injection device RQ1 injects gaseous fuel to the sintering charge level through the gaseous fuel nozzle RQ 101; the bottom array of the liquid fuel injection device RL1 is provided with a plurality of liquid fuel atomizing nozzles RL101, and the atomized liquid fuel is injected to the sintering charge level through the liquid fuel atomizing nozzles RL 101.

Preferably, the zone blowing device further comprises: steam injection devices ZQ1, the steam injection devices ZQ1 are arranged at two sides of the edge of the liquid fuel injection device along the advancing direction of the trolley S1 and are inclined towards the central midline L of the sintering charge surface of the trolley_InAnd blowing steam.

Preferably, the zone blowing device further comprises: the oxygen supplementing injection devices BY1 are arranged on two sides of the edge of the trolley S1 along the advancing direction of the trolley S1, and are horizontally arranged towards the center line L of the sintering charge surface of the trolley_InBlowing oxygen-enriched gas.

Preferably, the zone blowing device further comprises: gaseous fuel branch RQ2, gaseous fuel manifold RQ3, liquid fuel branch RL2, liquid fuel manifold RL 3; said gaseous fuel main RQ3 and said liquid fuel main RL3 are disposed outside of sintering machine enclosure S2, said gaseous fuel main RQ3 branching off said gaseous fuel branch RQ2 communicating with said gaseous fuel injection device RQ 1; the liquid fuel main pipe RL3 is branched into the liquid fuel branch pipes RL2 and communicated with the liquid fuel injection device RL 1.

Example 1

Example 2

Example 1 was repeated except that in step 4) the data D, C was obtained_{Water (W)}、C_COSubstituting the formula (1) to obtain a judgment parameter delta of each partition above the trolley;

judging the size of delta, selecting a blowing sintering mode:

wherein, D, C_{Water (W)}、C_COThe unit of (A) is mm,%, and percent; d_AverageThe historical average grain size of the mixture to be sintered is mm; c_{Average of water}For sinteringHistorical average volume concentration,%, of water vapor; c_{Average of CO}Is the historical average volume concentration,%, of CO during sintering; k1 is a particle size coupling coefficient, and the value is 0.7; k2 is the water vapor concentration coupling coefficient, and the value is 0.5; k3 is CO concentration coupling coefficient, and the value is 0.65.

Example 3

Example 2 was repeated except that step 1) further included: obtaining an ash mixing ratio H, an alkalinity ratio J and a solid fuel mixing ratio R of a mixture to be sintered, and comparing the obtained ash mixing ratio H, alkalinity ratio J and solid fuel mixing ratio R with historical average data stored in a system; obtaining a correction judgment parameter delta';

judging the size of delta, selecting a blowing sintering mode:

wherein: H. j, R units are%, and%; h_AverageThe historical average ash blending proportion in the blending of the mixture to be sintered is percent; j. the design is a square_AverageIs the historical average alkalinity proportion,%, in the mixture ingredients to be sintered; r_AverageThe historical average solid fuel ratio in the mixture ingredients to be sintered is percent; k4 is a coupling coefficient of the ash blending proportion, and the value is 0.75; k5 is alkalinity proportional coupling coefficient, and the value is 0.7; k6 is the solid fuel proportioning coupling coefficient, and the value is 0.6.

Example 4

Example 3 was repeated, except that in step 2), the injection of gaseous and liquid fuels into the trolley charge level in a zoned fashion was carried out in particular as follows: a plurality of groups of gaseous fuel injection devices and liquid fuel injection devices are arranged in the sintering cover body along the advancing direction of the sintering machine; each group of the gaseous fuel injection devices and the liquid fuel injection devices are independently controlled, the gaseous fuel is injected to the trolley charge level through the gaseous fuel injection devices, and the liquid fuel is injected to the trolley charge level through the liquid fuel injection devices.

Example 5

Example 4 was repeated except that in step 3), the volume concentration C of water vapor at the sintering charge level in each partition was monitored in real time_{Water (W)}And CO volume concentration C_COThe method specifically comprises the following steps: along the advancing direction of the sintering machine, a plurality of groups of water vapor concentration sensors and CO concentration sensors are arranged in the sintering cover body to monitor the water vapor volume concentration C on the sintering charge surface in each subarea in real time_{Water (W)}And CO volume concentration C_CO。

Example 6

Example 5 was repeated except that in step 2), the gaseous fuel injection device and the liquid fuel injection device were located directly above the sintering bed of the pallet, and the liquid fuel injection device was located directly above the gaseous fuel injection device, and the gaseous fuel injection device and the liquid fuel injection device were displaced to inject vertically downward, the injection path P1 of the gaseous fuel, and the injection path P2 of the liquid fuel.

Example 7

Example 6 is repeated, except that the method further comprises the steps of: 5) the two sides of the edge of the liquid fuel injection device along the advancing direction of the trolley are inclined towards the central line L of the sintering charge surface of the trolley_InSteam is injected to form a steam hood B covering the edge of the sintering area A, and a steam injection path P3 is formed.

Example 8

Example 7 is repeated, except that the method further comprises the steps of: 6) along the two sides of the edge of the trolley in the advancing direction of the trolley, and horizontally towards the central line L of the sintering charge level of the trolley_InBlowing oxygen-enriched gas.

Example 9

Example 8 was repeated except that the injection of gaseous and/or liquid fuel in step 2), the injection of steam in step 5), and the injection of oxygen-enriched gas in step 6) were carried out in a combined sequence.

Example 10

Example 9 is repeated, except that the oxygen-enriched gas injection in step 6) is carried out first, the steam injection in step 5) is carried out, and finally the gaseous fuel and/or liquid fuel injection in step 2) is carried out.

Example 11

Example 9 is repeated, except that the oxygen-enriched gas injection in step 6) and the steam injection in step 5) are carried out simultaneously, and the gaseous fuel and/or liquid fuel injection in step 2) is carried out.

Example 12

A liquid-gas two-phase medium coupling zone blowing device comprises: a gas fuel injection device RQ1, a liquid fuel injection device RL1, a water vapor concentration sensor C1, a CO concentration sensor C2 and a particle size recognition device C3; the particle size recognition device C3 is arranged at the front edge of the sintering machine cover body and is used for recognizing the particle size D of the mixture to be sintered; multiple groups of the water vapor concentration sensor C1 and the CO concentration sensor C2 are arranged in the sintering cover body along the moving direction of the trolley and used for monitoring the water vapor volume concentration C of the sintering charge surface of the trolley_{Water (W)}And CO volume concentration C_CO(ii) a A plurality of groups of the gas fuel injection device RQ1 and the liquid fuel injection device RL1 are arranged in the sintering machine cover body and are positioned above the trolley; the bottom of the gaseous fuel injection device RQ1 is provided with a gaseous fuel nozzle RQ101, and the gaseous fuel injection device RQ1 injects gaseous fuel to the sintering charge level through the gaseous fuel nozzle RQ 101; the bottom array of the liquid fuel injection device RL1 is provided with a plurality of liquid fuel atomizing nozzles RL101, and the atomized liquid fuel is injected to the sintering charge level through the liquid fuel atomizing nozzles RL 101.

Example 13

Example 12 was repeated except that the liquid fuel injection device was located directly above the gaseous fuel injection device and the liquid fuel atomizing nozzle of the gaseous fuel injection device was vertically displaced from the gaseous fuel nozzle of the liquid fuel injection device and injected downward. The liquid fuel injection device is a plane plate-shaped cavity, high-pressure liquid fuel is introduced into the liquid fuel injection device, the liquid fuel is atomized under the action of the liquid fuel atomization nozzle, and the atomized liquid fuel is injected downwards. The liquid fuel injection device is a square plate body.

Example 14

Example 13 was repeated except that the zone-blowing device further included: steam injection devices ZQ1, wherein the steam injection devices ZQ1 are arranged at two sides of the edge of the liquid fuel injection device along the advancing direction of the trolley and are inclined towards the central midline L of the sintering charge level of the trolley_InAnd blowing steam.

Example 15

Example 14 was repeated except that the zone blowing device further included: the oxygen supplementing injection devices BY1 are arranged on two sides of the edge of the trolley along the advancing direction of the trolley, and are horizontally arranged towards the center line L of the sintering charge level of the trolley_InBlowing oxygen-enriched gas.

Example 16

Example 15 was repeated except that the zone-blowing device further included: gaseous fuel branch RQ2, gaseous fuel manifold RQ3, liquid fuel branch RL2, liquid fuel manifold RL 3; the gaseous fuel main pipe RQ3 and the liquid fuel main pipe RL3 are arranged outside the sintering machine hood body, and the gaseous fuel main pipe RQ3 is branched into the gaseous fuel branch pipes RQ2 to be communicated with the gaseous fuel injection device RQ 1; the liquid fuel main pipe RL3 is branched into the liquid fuel branch pipes RL2 and communicated with the liquid fuel injection device RL 1.

Application example 1

The 360 square meter sintering machine in Wuhan iron and steel works has the following operating parameters: the historical average particle size D of the mixture to be sintered_AverageIs 1.5 mm; historical average volume concentration C of water vapor during sintering_{Average of water}Is 7%; historical average volume concentration C of CO during sintering_{Average of CO}The content was 10%.

Along the running direction of a sintering machine trolley, a sintering area of the sintering machine is divided into 4 subareas, namely an I subarea, a II subarea, a III subarea and an IV subarea. During the sintering process of the sintering machine, the particle size D of the mixture to be sintered in each subarea and the volume concentration C of water vapor on the sintering charge level of each subarea are respectively detected_{Water (W)}CO volume concentration C at the sintering level of each zone_CO(ii) a According to formula (1) in the method provided by the invention, the judgment parameters of each subarea are detected, so that pure gas fuel sintering, pure liquid fuel sintering or mixed combustion is selected in each subareaAnd (4) blowing and sintering the knots. Wherein: k1 is a particle size coupling coefficient, and the value is 0.8; k2 is the water vapor concentration coupling coefficient, and the value is 0.6; k3 is CO concentration coupling coefficient, and the value is 0.6.

According to the method provided by the invention, calculation and judgment are carried out, when the batch of the mixture to be sintered is sintered in the sintering machine, the I-th partition adopts a pure gas fuel injection sintering mode, the II-th partition adopts a gas + liquid injection sintering mode, the III-th partition adopts a gas + liquid injection sintering mode, and the IV-th partition adopts a pure liquid fuel injection sintering mode.

Application example 2

A sintering machine with 450 square meters in a steel and iron plant is applied, and the operation parameters are as follows: the historical average particle size D of the mixture to be sintered_AverageIs 1.5 mm; historical average volume concentration C of water vapor during sintering_{Average of water}Is 7%; historical average volume concentration C of CO during sintering_{Average of CO}The content was 10%. Historical average ash proportion H in mixture to be sintered_AverageIs 2%; historical average alkalinity ratio J in the mix of the mixture to be sintered_AverageIs 5%; historical average solid fuel ratio R in mixture ingredients to be sintered_AverageIs 5%;

along the running direction of a sintering machine trolley, a sintering area of the sintering machine is divided into 6 subareas, namely an I subarea, a II subarea, a III subarea, an IV subarea, a V subarea and a VI subarea. During the sintering process of the sintering machine, the particle size D of the mixture to be sintered in each subarea and the volume concentration C of water vapor on the sintering charge level of each subarea are respectively detected_{Water (W)}CO volume concentration C at the sintering level of each zone_COAcquiring the ash blending ratio H of the mixture to be sintered in the batch of the sintering pallet, acquiring the alkalinity ratio J of the mixture to be sintered in the batch of the sintering pallet, and acquiring the solid fuel blending ratio R of the mixture to be sintered in the batch of the sintering pallet; according to formula (2) in the method provided by the invention, the judgment of each partition is detectedParameters, whereby the injection sintering of pure gas fuel sintering, pure liquid fuel sintering or mixed sintering is selected in each partition. Wherein: k1 is a particle size coupling coefficient, and the value is 0.8; k2 is the water vapor concentration coupling coefficient, and the value is 0.6; k3 is CO concentration coupling coefficient, and the value is 0.6; k4 is a coupling coefficient of the ash blending proportion, and the value is 0.8; k5 is alkalinity proportional coupling coefficient, and the value is 0.7; k6 is the solid fuel proportioning coupling coefficient, and the value is 0.5.

According to the method provided by the invention, calculation and judgment are carried out, when the batch of mixture to be sintered is sintered in a sintering machine, the I zone adopts a pure gas injection sintering mode, the II zone adopts a pure gas injection sintering mode, the III zone adopts a gas + liquid injection sintering mode, the IV zone adopts a gas + liquid injection sintering mode, the V zone adopts a pure liquid injection sintering mode, and the VI zone adopts a pure liquid injection sintering mode.

Claims

1. A liquid-gas two-phase medium coupling partition blowing sintering method is characterized by comprising the following steps:

1) obtaining the particle size D of the current mixture to be sintered;

2) conveying the mixture to be sintered into a sintering machine through a trolley for sintering, and blowing gaseous fuel and/or liquid fuel to the material surface of the trolley in a partition mode; the method for blowing the gaseous fuel and the liquid fuel to the material surface of the trolley in a partition mode comprises the following steps: a plurality of groups of gaseous fuel injection devices and liquid fuel injection devices are arranged in the sintering cover body along the advancing direction of the sintering machine; each group of the gaseous fuel injection devices and the liquid fuel injection devices are independently controlled, gaseous fuel is injected to the trolley charge level through the gaseous fuel injection devices, and liquid fuel is injected to the trolley charge level through the liquid fuel injection devices;

3) monitoring the sintering of the mixture to be sintered on the trolley in real time to obtain the water vapor on the sintering charge level in each current subareaProduct concentration C_{Water (W)}And CO volume concentration C_CO；

4) Data D, C from step 1) and step 3)_{Water (W)}、C_COComparing the data with historical average data stored in the system, selecting one of the injection sintering modes of pure gas fuel sintering, pure liquid fuel sintering and mixed sintering in each partition, and adjusting the injection sintering mode in the step 2).

2. The liquid-gas two-phase medium coupling partition blowing sintering method as claimed in claim 1, wherein in step 4), data D, C is obtained_{Water (W)}、C_COSubstituting the formula (1) to obtain a judgment parameter delta of each partition above the trolley;

……(1)

judging the size of delta, selecting a blowing sintering mode:

3. The liquid-gas two-phase medium coupling partition blowing sintering method according to claim 2, wherein the step 1) further comprises: obtaining an ash mixing ratio H, an alkalinity ratio J and a solid fuel mixing ratio R of a mixture to be sintered, and comparing the obtained ash mixing ratio H, alkalinity ratio J and solid fuel mixing ratio R with historical average data stored in a system; obtaining a corrected judgment parameter delta';

……(2)

and (3) judging the size of delta', and selecting a blowing sintering mode:

when delta' is less than or equal to 2, adopting a sintering mode of pure gaseous fuel injection sintering;

when the value is more than 2 and less than or equal to 4, adopting a sintering mode of mixed blowing sintering;

when delta' is more than 4, adopting a sintering mode of pure liquid fuel injection sintering;

4. The liquid-gas two-phase medium coupling zone injection sintering method according to claim 3, wherein in the step 2), the gas fuel injection device and the liquid fuel injection device are positioned right above the sintering material surface of the trolley, the liquid fuel injection device is positioned right above the gas fuel injection device, the gas fuel injection device and the liquid fuel injection device are vertically and downwards injected in a staggered mode, and the injection path (P1) of the gas fuel and the injection path (P2) of the liquid fuel are injected.

5. The liquid-gas two-phase medium coupling partition blowing sintering method as claimed in claim 4, wherein in the step 3), the volume concentration C of water vapor on the sintering charge level in each partition is monitored in real time_{Water (W)}And CO volume concentration C_COThe method specifically comprises the following steps: along the advancing direction of the sintering vehicle, a plurality of groups of water vapor are arranged in the sintering cover bodyA concentration sensor and a CO concentration sensor for monitoring the volume concentration C of water vapor on the sintering charge surface in each subarea in real time_{Water (W)}And CO volume concentration C_CO。

6. The liquid-gas two-phase medium coupling partition blowing sintering method according to claim 5, characterized by further comprising the steps of:

5) the two sides of the edge of the gaseous fuel injection device along the advancing direction of the trolley are inclined towards the central midline (L) of the sintering charge surface of the trolley_In) Steam is injected to form a steam cover (B) covering the edge of the sintering area (A), and a path (P3) for injecting the steam is formed.

7. The liquid-gas two-phase medium coupling partition blowing sintering method according to claim 6, characterized by further comprising the steps of:

6) the two sides of the edge of the trolley along the advancing direction of the trolley are horizontally towards the central center line (L) of the sintering charge level of the trolley_In) Oxygen-enriched gas is blown, and a path where oxygen-enriched gas is blown is P4.

8. The liquid-gas two-phase medium coupled partition blowing sintering method according to claim 7, wherein the gaseous fuel and/or liquid fuel blowing in step 2), the steam blowing in step 5), and the oxygen-enriched gas blowing in step 6) are performed in a combined sequence.

9. The liquid-gas two-phase medium coupled partition injection sintering method according to claim 8, wherein the oxygen-enriched gas injection in step 6) is performed first, the steam injection in step 5) is performed, and finally the gaseous fuel and/or the liquid fuel injection in step 2) is performed.

10. The liquid-gas two-phase medium coupled partition injection sintering method according to claim 8, wherein the oxygen-rich gas injection in step 6) and the steam injection in step 5) are simultaneously performed, and then the gaseous fuel and/or the liquid fuel injection in step 2) are performed.

11. A liquid-gas two-phase medium coupling zone blowing device using the liquid-gas two-phase medium coupling zone blowing sintering method according to any one of claims 1 to 10, wherein the zone blowing device comprises: a gas fuel injection device (RQ 1), a liquid fuel injection device (RL 1), a water vapor concentration sensor (C1), a CO concentration sensor (C2) and a particle size recognition device (C3);

the particle size recognition device (C3) is arranged at the front edge of the sintering machine cover body and is used for recognizing the particle size D of the mixture to be sintered;

multiple groups of the water vapor concentration sensor (C1) and the CO concentration sensor (C2) are arranged in the sintering cover body along the moving direction of the trolley and used for monitoring the water vapor volume concentration C of the sintering charge level of the trolley_{Water (W)}And CO volume concentration C_CO；

A plurality of groups of the gaseous fuel injection device (RQ 1) and the liquid fuel injection device (RL 1) are arranged in the sintering machine cover body and are positioned above the trolley; the bottom of the gaseous fuel injection device (RQ 1) is provided with a gaseous fuel nozzle (RQ 101), and the gaseous fuel injection device (RQ 1) injects gaseous fuel to the sintering charge level through the gaseous fuel nozzle (RQ 101);

the bottom array of the liquid fuel injection device (RL 1) is provided with a plurality of liquid fuel atomizing nozzles (RL 101), and the atomized liquid fuel is injected to the sintering charge level through the liquid fuel atomizing nozzles (RL 101).

12. The liquid-gas two-phase medium coupling zone blowing device of claim 11, wherein the liquid fuel blowing device is located right above the gaseous fuel blowing device, and a liquid fuel atomizing nozzle of the gaseous fuel blowing device is vertically and downwardly blown by being staggered with a gaseous fuel nozzle of the liquid fuel blowing device; and/or

The zone blowing device further comprises: a steam injection device (ZQ 1) arranged at the liquid fuel injection device (ZQ 1) along the advancing direction of the trolleyThe two sides of the edge of the device are inclined to the central midline (L) of the sintering charge level of the trolley_In) Blowing steam; and/or

The zone blowing device further comprises: the oxygen supplementing injection devices (BY 1) are arranged on two sides of the edge of the trolley along the advancing direction of the trolley, and horizontally face the central line (L) of the sintering charge level of the trolley_In) Blowing oxygen-enriched gas.

13. The liquid-gas two-phase medium coupled zone blowing device of claim 12, wherein the zone blowing device further comprises: gaseous fuel branch (RQ 2), gaseous fuel manifold (RQ 3), liquid fuel branch (RL 2), liquid fuel manifold (RL 3); the gaseous fuel main pipe (RQ 3) and the liquid fuel main pipe (RL 3) are arranged outside the sintering machine hood body, and the gaseous fuel main pipe (RQ 3) is divided into the gaseous fuel branch pipes (RQ 2) to be communicated with the gaseous fuel injection device (RQ 1); the liquid fuel main pipe (RL 3) is branched to the liquid fuel branch pipe (RL 2) and communicated with the liquid fuel injection device (RL 1).